HomeMy WebLinkAboutNon-Residential_Credit_Application_Manual
Storm Water Utility
Non-Residential Credit Application
Manual
City of Oshkosh
Department of Public Works
2025
Non-Residential Credit Manual 1 2025
Table of Contents
Preface ............................................................................................................................................ 3
Chapter 1: Introduction .................................................................................................................... 4
Utility Charge Rate for Residential Property ........................................................................... 4
Utility Charge Rate for Non-Residential Property ................................................................... 4
The Utility Fee Credit Policy.................................................................................................... 4
Chapter 2: Credit Policy ................................................................................................................... 6
General Information ................................................................................................................ 6
Credit Structure ....................................................................................................................... 6
Flow Control Credit ................................................................................................................. 7
Pollution Control Credit ........................................................................................................... 7
Maximum Credit ...................................................................................................................... 7
Chapter 3: Flow Control Credits ..................................................................................................... 8
Flow Control Structural Credit ................................................................................................. 8
Riparian Property Credit ......................................................................................................... 9
Chapter 4: Pollution Control Credit ............................................................................................... 12
Chapter 5: City of Oshkosh Storm Water Utility: Credit Application Forms.................................. 16
Form 1 - Storm Water Service Charge Credit Application Information ................................. 16
Form 2 - Storm Water Service Charge Credit Application Calculations ............................... 18
Chapter 6: Example Credit Applications ........................................................................................ 20
Non-Residential Credit Manual 2 2025
This Page Intentionally Left Blank
Non-Residential Credit Manual 3 2025
Preface
Send Application Forms to:
City of Oshkosh
Department of Public Works
Attn: Storm Water Utility Credit
215 Church Avenue
P.O. Box 1130
Oshkosh, WI 54903-1130
For Questions Regarding the Credit
Application, Contact:
Alyssa Deckert, P.E.
Civil Engineer Supervisor
adecket@oshkoshwi.gov
(920) 236-5065
Make Checks Payable to: City of Oshkosh
Application Procedure:
The credit application procedure for the Oshkosh Storm Water Utility is summarized below:
1. Each applicant must complete the required forms and furnish the required information.
Forms may be found with this application, or on the city web page:
http://www.ci.oshkosh.wi.us/.
2. The Director of Public Works (Director or Designee) will conduct an initial review of Storm
Water Utility Credit Application within thirty (30) calendar days of receipt of the application
form and payment of fee. Application fees are one-time and non-refundable.
3. Reviewers will check application forms for completeness and accuracy. If the application
is found to be complete and accurate, a letter will be sent to the applicant notifying
approval of the credit.
4. Application for any credit is an acknowledgement of the City of Oshkosh’s (city) right-of-
entry to inspect and verify the information submitted on said application.
5. If deficiencies are found during the review, a deficiency letter will be sent to the
applicant’s contact person. Upon receipt of additional information from applicant, the
review will resume and be completed within thirty (30) calendar days of receipt of the
additional information.
6. Pending approval of the credit request, any and all credits will be granted retroactive to
the date of the initial, complete credit request submittal. The Director shall determine
whether a submittal is complete using the current credit request submittal requirements.
7. If an application is denied, a letter explaining the reasons for the denial will be provided to
the applicant.
8. The applicant has the right to appeal this decision, in accordance with the procedures
outlined in Chapter 14 of the City of Oshkosh Municipal Code.
9. All credits shall be subject to an annual review for compliance with the current year’s
credit policy. Credits may vary or be eliminated over time subject to the terms of the
current year’s credit policy. It is the responsibility of the billed customer to provide the
Director with any and all changes to the conditions of the onsite management practices
and conditions that may affect the credit rate for the site. Violations of the terms and/or
conditions of the credit request may be subject to collection of utility fees retroactive to
the date of the violation.
Non-Residential Credit Manual 4 2025
Chapter 1: Introduction
The Common Council of the City of Oshkosh, Wisconsin created a storm water utility through
ordinance adoption (Municipal Code Chapter 24, since revised to Municipal Code Chapter 14) in
November of 2002. The citywide Storm Water Utility was created to provide an equitable, stable
funding source for the city's storm water management services.
The primary revenue source for the Storm Water Utility is the fee charged to all developed
property in the city. Storm Water Service Charges to a property are related to the amount of
storm water runoff from the property. The charge is based upon the amount of impervious area
on each property. Typical impervious areas include sidewalks, driveways, roofs, patios, parking
lots, and compacted gravel.
The impervious area delineations for each property are based on measurements from aerial
photographs and site plans. Geographical Information Systems (GIS) was used to calculate the
impervious area from the delineations. If a property owner believes the measurements for their
property are not accurate, they may submit appropriate paperwork for review. The property
owner should consult with the Department of Public Works to determine the appropriate
submittals to change the calculated amount of impervious area.
Utility Charge Rate for Residential Property
A statistical sampling of residential properties within the city determined that an average
developed single-family residential property has 2,817 square feet of impervious area. As a
result, 2,817 square feet is used as the base billing unit or ERU (equivalent runoff unit) for the
utility. Each 1-, 2-, or 3-family residential property is assigned a rate based on a 3-tiered rate
structure. Those residential properties with smaller amounts of impervious area are charged a
lower fee than those residential properties with larger amounts of impervious area.
Utility Charge Rate for Non-Residential Property
The charge for all other properties (commercial, industrial, government, tax-exempt,
condominiums, etc) is determined on a case-by-case basis according to the actual amount of
impervious area on the property. The amount of impervious area is measured in square feet and
divided by 2,817. The result of that division is rounded to the nearest tenth and becomes the
number of ERUs assigned to the property. The number of ERUs multiplied by the unit-billing rate
as adopted by a Common Council resolution yields the annual storm water service charge for that
particular property.
The number of ERUs assigned to properties will remain fixed unless physical changes are made
that alter the amount of the impervious surface area. In these cases, billing changes will be made
automatically at the completion of construction. Typically, these changes will be triggered
through the building permit process.
The Utility Fee Credit Policy
The City of Oshkosh has developed a system of credits for storm water service customers who:
(1) Discharge all or a portion of the storm water directly into the Fox River, Lake Butte des
Morts, or Lake Winnebago without sending it through a municipal storm water conveyance
system and/or
(2) Have facilities or controls in place to temporarily store storm water runoff from their
property, thereby reducing the impact of flow and/or pollution on the drainage system.
Non-Residential Credit Manual 5 2025
This manual details the policies and procedures applicable to the storm water service charge
credit program.
Non-Residential Credit Manual 6 2025
Chapter 2: Credit Policy
General Information
The purpose of this Stormwater Utility Credit Policy is to encourage actions by property owners
within the city that 1) reduce stormwater flows and volumes and improve stormwater quality and
2) reduce the utility’s costs for providing proper management of stormwater runoff. This policy is
applicable only to non-residential properties in the City of Oshkosh. For purposes of this policy, a
residential parcel has three or fewer dwelling units. All other properties are considered non-
residential. Credits to user fees will only be allowed when it can be demonstrated by the
customer that a condition or activity on the property results in a direct reduction in costs for
Stormwater Utility services. Those conditions and activities are specified in this policy.
Billing adjustments required to implement credits shall be applied retroactively to the date the
customer submitted a complete application. Adjustments shall be made by crediting the
customer’s storm water service charge until any overpayment has been fully repaid. A pending
application for credit shall not constitute a valid reason for non-payment of the current Storm
Water Service Charges. In the case of new development, Storm Water Service Charges and the
associated credits detailed herein do not apply until construction is complete and verified by the
Department, or upon granting of conditional occupancy, whichever is earlier.
1 ERU = 2,817 square feet
Credit Structure
For the purpose of generating applicable credit rates, the municipal stormwater management
services funded through the user fee are divided into two major categories. The credit eligible
category is further divided into two sub-categories. Below are the categories and the pro-rated
portion of the total city stormwater program budget that funds each category.
Category A (utility-wide services) 25%
Category B (credit eligible services)
B1: activities that meet flow management criteria 50%
B2: activities that meet pollution reduction criteria 25%
Fees to support Category A programs are applied throughout the utility customer base and
credits are not allowed for these components. These costs are required to administer the City of
Oshkosh’s stormwater management program and these programs benefit all property owners
within the City of Oshkosh.
Only the costs associated with Category B are eligible for a credit. These are costs associated
with the utility’s efforts to maintain the capacity of the stormwater conveyance system and
implement and maintain pollution control practices.
The tasks included under each category, and the percent credit for each category under this
policy may be revised based upon a re-analysis of the stormwater program budget and the
percent distribution of costs by category. Modifications must be approved by Common Council
resolution. The approved credit amount will be applied to each stormwater utility bill for as long
as the property owner maintains their credit eligibility status in accordance with this policy.
The credits described in this policy will apply to all new credit applications upon the day following
City Council approval of this policy. The revisions to this policy are not retroactive. All previously
approved credits will remain effective, provided that the site conditions remain unchanged, and
the credit eligible practice remains in place, as per the previously approved credit.
Non-Residential Credit Manual 7 2025
Flow Control Credit
A. Flow Control Structure Credits
Flow Control Structure credits are offered to customers that maintain private runoff
facilities or controls, such as detention or retention facilities, which significantly restrict
storm water runoff rates released from their property. Flow Control Structure Credits shall
be conditioned upon the compliance with the design, operation, and maintenance
requirements of all the applicable ordinances and codes of the City of Oshkosh, State or
Federal Permitting, and this Storm Water Credit Application Manual. Qualification
requirements and application procedures for these credits are outlined in Chapter 3.
B. Riparian Property Credit
Riparian property credit is available to properties that discharge storm water directly into
the Fox River, Lake Butte des Morts, or Lake Winnebago. Qualification requirements and
application procedures for this credit are outlined in Chapter 3.
Pollution Control Credit
Pollution control credit is offered to customers that achieve storm water pollutant load reduction
by implementing a storm water control practice, such as wet detention ponds, rain gardens, or
infiltration basins. Pollution control credit shall be conditioned upon the amount of storm water
pollutant load controlled as calculated by the appropriate storm water model. Qualification
requirements and application procedures for this credit are outlined in Chapter 4.
Maximum Credit
The maximum aggregate credit to the Storm Water Service Charge of any individual property is
75% of its gross billing amount, regardless of how many individual credits for which the property
qualifies. Land developments must conform to all applicable ordinances and standards of the
City of Oshkosh to be credit eligible.
Non-Residential Credit Manual 8 2025
Chapter 3: Flow Control Credits
Flow Control Structural Credit
This credit applies to all properties that provide privately constructed and maintained runoff flow
control structural measures, or will provide privately constructed and maintained runoff flow
control structural measures as a component of a land development process. The credit is based
on the reduction of post-development runoff flow. A property must show that it exceeds the
minimum flow control requirements of the local ordinances or policies in effect at the time of the
land development activity.
To determine the credit amount, the post-development site peak runoff rate with no management
will be compared to the post-development site peak runoff rate with management. This
percentage reduction will then be multiplied by the maximum amount of flow control credit (i.e. 50
percent) to determine the utility rate credit. All calculations shall use the 10-year, 24-hour, SCS
Type II distribution with a rainstorm depth of 3.56 inches (as referenced Midwest Climate Center
Bulletin 71) over 24 hours. See submittal requirements below and Credit Application Form
Example 2 at end of this document for further information.
For example:
A B C
Post-Development Flow
Rate (before
management measures)
Post-Development Flow
Rate (after management
measures)
% “Control”
1-(B/A)
Credit
(C) x 50%
Example 1: 50 cfs 10cfs 80% 40%
Example 2: 50 cfs 5 cfs 90% 45%
Example 3: 100 cfs 5 cfs 95% 47.5%
Note: “cfs” is the flow rate in “cubic feet per second”
Application Requirements for Flow Control Structure Credit
The completed Flow Control Structure Credit application must include a $200.00 application fee
and the following information:
1. Operation and Maintenance Agreement: A written maintenance agreement between the
private landowner(s) and the City of Oshkosh. Among other conditions, the agreement shall
allow the city to have access and conduct inspections of the control practice(s) to verify that
proper maintenance is being conducted.
2. Maintenance information: Any agreements or contracts for inspection and/or maintenance are
required to be disclosed as part of the application. Indicate the schedule for major
maintenance that will be performed and how many times per year basic maintenance (such
as erosion control and/or mowing) activities are performed. In order to maintain the Flow
Control credit, the property owners shall provide the city with inspection reports by January
1st of every subsequent year. If a property owner fails to file required inspection reports or if a
city inspection finds the system not meeting the conditions set forth in this manual, the city
will send a letter informing the property owner of the required action to avoid revocation of the
Flow Control credits. If the property owner fails to take the required action, the flow control
credits will be revoked until the situation is corrected. No retroactive credits will be given
during said lapse period. Credits will be restored on the effective date of the submittal of the
property owner’s acceptable response
Non-Residential Credit Manual 9 2025
3. Technical information (certified by a Wisconsin Professional Engineer or Professional
Hydrologist):
a) Narrative describing the site and post-development flow control practices
b) Site plan(s) at a scale of 1”=100’ or larger (i.e. 1”=50’ or 1”=20’ etc.) appropriate to
display the following information clearly:
1) Locations, dimensions, and characteristics of all drainage patterns and storm
water management facilities
2) Location of all impervious surfaces including, but not limited to: structures,
parking, driveways, etc.
3) Soils
4) Site topography
5) Details of detention facility outlet structure(s)
6) Diagram of watershed routing to the detention facility(s)
7) As built construction drawings verifying the storm water management structural
information.
c) Summary of runoff peak flow calculations for the 10-year, 24-hour rain event, by
watershed, including:
1) Existing flow rates
2) Post-development flow rates without management
3) Post-development flow rates with management
d) Calculations (and factors used for calculations) performed to determine existing, post-
developed "managed", and post-developed "un-managed" peak flow control including,
but not limited to:
1) Time of concentration(s)
2) Curve number(s)
3) Watershed areas
4) Watershed routing
5) Engineered designs for all structural flow control management practices
6) Stage-storage-discharge tables or curves for the detention facility(s)
7) Tailwater impacts, if any
e) All survey information shall utilize NAVD88 vertical datum.
3. Municipal Code and Construction Standards: Appropriate documents showing that the City of
Oshkosh Municipal Code Chapter 14 and Construction Standards in effect at the time of
construction were met at the time of development. Retrofitting of existing storm water
management structures is allowed to provide, or increase, the amount of credit for a property.
As-built data shall be submitted for the existing or retrofitted structure before the credit will be
applied. A Wisconsin Professional Engineer or Professional Hydrologist must certify the
calculations.
4. Statement of Certification: The owner shall sign a statement certifying that information is
correct and acknowledging that the credit determination will be based on information
provided. A later determination that the application information was inaccurate may result in
loss of credit.
NOTE: Developers are encouraged to apply for flow control credits on new developments upon
completion of as-built drawings.
See Chapter 5 for an example application for the Post Construction Flow Control Credits.
Riparian Property Credit
Properties that are directly riparian to the following water bodies: Lake Butte des Morts, Fox
River, or Lake Winnebago are eligible for this credit. (Constructed channels adjacent to Lake
Winnebago, Fox River, or Lake Butte de Morts are considered riparian. See map attached to this
Non-Residential Credit Manual 10 2025
document for the areas designated as “constructed channels for purposes of this policy).
Impervious areas that drain directly to one of these water bodies without entering into the
municipal stormwater conveyance system are eligible for up to 50% credit. The property owner is
only eligible for the quantity portion of the utility credit under the Riparian Credit Section of this
policy.
Properties located on other creeks, streams, and/or ditches, are not eligible for this credit.
The maximum credit under the riparian policy is 50% of the property’s stormwater utility fee.
Under the riparian policy, the level of credit would be met if 100% of the property’s impervious
surface discharged directly to Lake Winnebago, Lake Butte des Morts, or the Fox River without
entering a municipal storm water conveyance system.
This credit need only be applied for once, but may be reviewed if the property is redeveloped or
re-graded.
Application Requirements for Riparian Property Credit
The completed Riparian Property Credit application must include a $200.00 application fee and
the following information:
Plat of survey certified by a Wisconsin-Registered Land Surveyor, or as-built construction site
plan certified by a Wisconsin Professional Engineer or Professional Hydrologist, indicating the
following:
1. The location of the Fox River, Lake Butte des Morts, or Lake Winnebago
2. Watershed breaks across the property
3. Layout of impervious surface areas on the property
4. Layout of the drainage system on the property, including location and elevations of natural
and man-made features
5. Sufficient topographic data or elevations to verify general drainage patterns across the
property.
6. A calculation of impervious area (in square feet) for each delineated drainage area on the
property.
7. All survey information shall utilize NAVD88 vertical datum.
See Chapter 5 for an example application for the Riparian Property Credit.
Non-Residential Credit Manual 11 2025
This Page Intentionally Left Blank
Non-Residential Credit Manual 12 2025
Chapter 4: Pollution Control Credit
The amount of storm water pollution control achieved with a structural management practice will
be calculated using the Source Loading and Management Model (SLAMM), Information on how
to access SLAMM is available at:
https://dnr.wisconsin.gov/topic/Stormwater/standards/slamm.html.
Using the appropriate model, the applicant must calculate the average annual Total Suspended
Solids (TSS) and Total Phosphorus (TP) loads under two conditions: 1) the property without any
pollution control practice(s) and 2) the same property with the pollution control practice(s). The
land cover, conveyance system, and other physical characteristics must be identical under both
conditions.
The following categories of properties may receive up to a 25% credit on their stormwater fee for
pollution control activities.
Explanation of Credits
A. New Land Development
By state and local regulations, all new land development (occurring after October 1, 2004) must
meet a post-construction pollution reduction of 80% TSS. By local regulations, all new land
development occurring after January 1, 2026 must also achieve a TP reduction of 54%.
Properties with new land development may receive up to a 25% credit for exceeding the minimum
pollution control requirements. To be eligible for a pollution control credit a new development
must meet all applicable pollution reduction standards in place at the time of development. Sites
that were granted Maximum Extent Practicable (MEP) approval for a portion of the requirements
are not credit eligible. The process for credit calculation and conditions to be met are as follows:
1. The level of credit is determined as follows:
a) 80% - 85.0% TSS reduction or 54% - 57% TP reduction = 0% credit
b) 85.1% - 90.0% TSS reduction or 57.1% - 61% TP reduction = 20% credit
c) Greater than 90% TSS reduction or greater than 61% TP reduction = 25% credit
2. The structural pollution control practice(s) are owned, operated, and maintained by
private landowner(s),
3. There is a written maintenance agreement in place between the private landowner(s) and
the City of Oshkosh. Among other conditions, the agreement shall allow the city to have
access and conduct inspections of the control practice(s) to verify that proper
maintenance is being conducted, and
4. The credit recipient must submit an annual report to the city stating that the pollution
control practice is maintained and operating as designed. This section of the policy
applies to all land development on or after October 1, 2004 (the effective date of the
state regulations).
5. See submittal requirements below and Credit Application Form Example 3 at end of this
document for further information.
B. Redeveloped Lands
Lands that were developed before October 1, 2004 and are undergoing re-development may
receive a utility rate credit by installing pollution reduction practices. These properties may
receive up to a 25% utility fee credit. The process for credit calculation and conditions to be met
are as follows:
1. For site redeveloped prior to January 1, 2026 the level of credit is determined as follows:
a) Less than 40% TSS reduction (if MEP approved by city) = 5% credit
b) 40% - 50% TSS reduction = 15% credit
Non-Residential Credit Manual 13 2025
c) Greater than 50 % TSS reduction = 25% credit
2. For sites redeveloped after January 1, 2026 the level of credit is determined as follows:
a) Less than 58.4% TSS reduction and 30% TP reduction (if MEP approved by city)
= 5% credit
b) 58.4% - 65% TSS reduction or 30% - 44% TP reduction = 15% credit
c) Greater than 65% TSS reduction or greater than 44% TP reduction = 25% credit
3. The structural pollution control practice(s) are owned, operated, and maintained by
private landowner(s),
3. There is a written maintenance agreement in place between the private landowner(s) and
the City of Oshkosh. Among other conditions, the agreement shall allow the city to have
access and conduct inspections of the control practice(s) to verity that proper
maintenance is being conducted,
4. The credit recipient submits an annual report to the city stating that the pollution control
practice is maintained and operating as designed, and
5. This section of the policy applies to: application of storm water pollution control to lands
developed before October 1, 2004 (the effective date of the state regulations).
6. See submittal requirements below and Credit Application Form Example 3 (for similar
approach) at end of this document for further information.
C. Pollution Control Credit Eligibility for Existing Developed Lands (not being redeveloped)
Properties that are in neither category (B2a or B2b) may receive a credit up to 25% of the
property’s utility fee. The process for credit calculation and conditions to be met are as follows:
1. Level of credit is determined as follows:
a) Up to 10% TSS reduction = 5% credit
b) 10% - 20% TSS reduction = 15% credit
c) Greater than 20% TSS reduction = 25% credit
2. The structural pollution control practice(s) are owned, operated, and maintained by
private landowner(s),
3. The owner must provide calculations showing the TP reduction achieved by the
practice(s).
4. There is a written maintenance agreement in place between the private landowner(s) and
the City of Oshkosh. Among other conditions, the agreement shall allow the city to have
access and conduct inspections of the control practice(s) to verify that proper
maintenance is being conducted,
5. The credit recipient submits an annual report to the city stating that the pollution control
practice is maintained and operating as designed, and
6. This section of the policy applies to: application of storm water pollution control to lands
developed before October 1, 2004 (the effective date of the state regulations). See
Section IV for submittal requirements.
7. If the property is an industrial site with an existing industrial NR 216 permit, the storm
water management practice(s) must reduce the sediment pollution from the regulated
area by greater than the minimum permit requirements.
8. For non-regulated areas (non NR 216 permitted areas) of an industrial property, the
credit levels listed under c. 1. above) shall apply.
9. See submittal requirements below and Credit Application Form Example 3 (for similar
approach) at end of this document for further information.
Application Requirements
The completed Pollution Control Credit application must include a $200.00 application fee and the
following information:
1. Maintenance information: Any agreements or contracts for inspection and/or maintenance are
required to be disclosed as part of the application. Indicate the schedule for major
maintenance that will be performed and how many times per year basic maintenance (such
as erosion control and/or mowing) activities are performed. In order to maintain the Pollution
Control credit, the property owners shall provide the city with inspection reports by January
1st of every subsequent year. If a property owner fails to file required inspection reports or if a
Non-Residential Credit Manual 14 2025
city inspection finds the system not meeting the conditions set forth in this manual, the city
will send a letter informing the property owner of the required action to avoid revocation of the
Pollution Control credits. If the property owner fails to take the required action, the flow
control credits will be revoked until the situation is corrected. No retroactive credits will be
given during said lapse period.
2. Credits will be restored on the effective date of the submittal of the property owner’s
acceptable response.
3. Technical information (certified by a Wisconsin Professional Engineer or Professional
Hydrologist):
a) Narrative describing the site and post-development flow control practices
b) Site plan(s) at a scale of 1”=100’ or larger (i.e. 1”=50’ or 1”=20’ etc.) appropriate to
display the following information clearly:
1) Locations, dimensions, and characteristics of all drainage patterns and storm
water management facilities
2) Location of all impervious surfaces including, but not limited to: structures,
parking, driveways, etc.
3) Soils
4) Site topography
5) Details of detention facility outlet structure(s)
6) Diagram of watershed routing to the detention facility(s)
7) As built construction drawings verifying the storm water management structural
information.
c) Summary of TSS and TP in the watershed, including:
1) Existing TSS and TP
2) Post-development TSS and TP without management
3) Post-development TSS and TP with management
d) Calculations (and factors used for calculations) performed to determine existing, post-
developed "managed", and post-developed "un-managed" pollutant control including, but
not limited to:
1) Landuse Areas (percent imperviousness)
2) Soil type
3) Engineered designs for all structural pollution control management practices
4) Stage-storage-discharge tables or curves for the detention facility(ies)
e) All survey information shall utilize NAVD88 vertical datum.
3. Municipal Code and Construction Standards: Appropriate documents showing that the City of
Oshkosh Municipal Code Chapter 14 and Construction Standards in effect at the time of
construction were met at the time of development. Retrofitting of existing structures is
allowed to provide, or increase the amount of credit for a property. As-built data shall be
submitted for the existing or retrofitted structure before the credit will be applied. A Wisconsin
Professional Engineer or Professional Hydrologist must certify the calculations.
4. Statement of Certification: The owner shall sign a statement certifying that information is
correct and acknowledging that the credit determination will be based on information
provided. A later determination that the application information was inaccurate may result in
loss of credit.
NOTE: Developers are encouraged to apply for pollution control credit on new developments
upon completion of as-built drawings.
See Chapter 5 for an example application for the pollution control credit.
Non-Residential Credit Manual 15 2025
This Page Intentionally Left Blank
Non-Residential Credit Manual 16 2025
Chapter 5: City of Oshkosh Storm Water Utility: Credit Application Forms
Form 1 - Storm Water Service Charge Credit Application Information
Credits Applied for (check all that apply):
Pollution Control
Riparian
Flow Control Structure
Review Fee:
The property owner submitting the credit application shall pay a one-time review fee.
Fees are as follows:
Flow Control Credit Only = $200
Pollution Control Credit Only = $200
Flow Control and Pollution Control Credit = $300
Does the application have a check enclosed? Yes No
Applicant Information (Financially Responsible Entity): (Please print or type)
Name:
Address:
City: State: Zip Code:
Contact: Email: Telephone:
Property Owner Information (If Different from Above):
Name:
Address:
City: State: Zip Code:
Property Information:
Property Location/Address:
Parcel Number: Property Size: (SF/Acre)
Receiving Water’s Name (if applicable): Impervious Area (SF):
Brief Description of Storm Water Facilities at Location (if applicable):
Plan Review Information:
Has this project and its storm water calculations been previously approved by the city? Yes No
If Yes, date of final approval of plan and calculations:
(If no copy is on file, city will notify Applicant to request a copy.)
If No, provide copies of as-built plans and calculations showing the project meets minimum city requirements.
Please indicate the review information that you are attaching to this application:
Narratives Site Plans Survey Plat with
Topography Runoff Calculations
Routing Calculations Stage/Storage/Dischar
ge Tables Outlet Structure
Details As-Built Plans
Operations and
Maintenance Manual SLAMM Calculations
Non-Residential Credit Manual 17 2025
Certifications:
The above information is true and correct to the best of my knowledge and belief. (This form must be
signed by the financially responsible person if an individual, or if not an individual, by an officer, director,
partner, or registered agent with authority to execute instruments for the financially responsible person). I
agree to provide corrected information should there be any change in the information provided herein.
Type or print name Title or Authority
Signature Date
The following certification is required for approval of all credits for which a certified technical
submission was required:
The above information and the information on Form 2 was prepared either by or under the supervision of
myself as the qualified professional and is true and correct to the best of my knowledge and belief.
Type or print name Professional License Type and Number
Signature Date Phone
Non-Residential Credit Manual 18 2025
Form 2 - Storm Water Service Charge Credit Application Calculations
(Form 1 must accompany this application form)
(1) Total Gross Impervious Area: (sq. ft.)
Flow Control Structure (10-year – 24 hour storm event)
All storm water management requirements were met at the time of construction: Yes No
(2) Percent of site’s impervious area draining to Flow Control measure: (%)
(3) Post-Developed 10-year flow without management: (cfs)
(4) Post-Developed 10-year flow with management: (cfs)
(5) Reduction of Flow Provided ((3) - (4)): (cfs)
(6) Percent Reduction ((5)/(3) * 100): (%)
(7) Flow Control Credit [((2) *(6))/10,000*50%]: (%)
(Maximum is 50%)
Riparian Property Credit
(8) Impervious Area Drainage Directly to Water Body: (sq. ft.)
(9) Percent of Area Drainage Directly to Water Body ((8)/(1) * 100): (%)
(10) Riparian Property Credit ((9)/100*50%): (%)
(Maximum is 50%)
Pollution Control:
All storm water pollution reduction requirements were met at the time of construction: Yes No
A. New Land Development
(11) Post-Developed TSS without management: (lbs)
(12) Post-Developed TSS with management: (lbs)
(13) Reduction of TSS Provided ((11) –(12)): (lbs)
(14) Percent TSS Reduction ((13)/(11) * 100): (%)
(15) Post-Developed TP without management: (lbs)
(16) Post-Developed TP with management: (lbs)
(17) Reduction of TP Provided ((15) –(16)): (lbs)
(18) Percent TP Reduction ((17)/(15) * 100): (%)
(19) Pollution Control Credit: (%)
If (14) = 80.0%-85.0 % or if (18) = 54%-57% Credit = 0% (Maximum is 25%)
If (14) = 85.1%-90.0 % or if (18) = 57.1%-61% Credit = 20%
If (14) > 90.0% or if (18) > 61% Credit= 25%
B. Redeveloped Lands (prior to January 1, 2026)
(20) Post-Developed TSS without management: (lbs)
(21) Post-Developed TSS with management: (lbs)
(22) Reduction of TSS Provided ((20) –(21)): (lbs)
(23) Percent Reduction ((22)/(20) * 100): (%)
(24) Pollution Control Credit: (%)
If (23) < 40.0 % Credit = 5% (Maximum is 25%)
If (23) = 40.0%-50.0 % Credit = 15%
If (23) > 50.0 % Credit = 25%
Non-Residential Credit Manual 19 2025
C. Redeveloped Lands (after January 1, 2026)
(25) Post-Developed TSS without management: (lbs)
(26) Post-Developed TSS with management: (lbs)
(27) Reduction of TSS Provided ((25) –(26)): (lbs)
(28) Percent TSS Reduction ((27)/(25) * 100): (%)
(29) Post-Developed TP without management: (lbs)
(30) Post-Developed TP with management: (lbs)
(31) Reduction of TP Provided ((29) –(30)): (lbs)
(32) Percent TP Reduction ((31)/(29) * 100): (%)
(33) Pollution Control Credit: (%)
If (28) < 58.4% and if (32) < 30% Credit = 5% (Maximum is 25%)
If (28) = 58.4%-65% or if (32) = 30%-44% Credit = 15%
If (28) > 65% or if (32) > 44% Credit = 25%
D. Existing Developed Lands (not being redeveloped)
(34) Existing-Developed TSS without management: (lbs)
(35) Existing-Developed TSS with management: (lbs)
(36) Reduction of TSS Provided ((34) –(35)): (lbs)
(37) Percent Reduction ((36)/(34) * 100): (%)
(38) Existing Developed TP without management: (lbs)
(39) Existing Developed TP with management: (lbs)
(40) Reduction of TP Provided ((38) –(39)) (lbs)
(41) Percent TP Reduction ((40)/(38) * 100): (%)
(42) Pollution Control Credit: (%)
If (37) < 10.0 % Credit = 5% (Maximum is 25%)
If (37) = 10.0%-20.0 % Credit = 15%
If (37) > 20.0 % Credit = 25%
Credit Summary
Flow Control Structure Credit (7): % (Maximum 50%)
Riparian Property Credit (10): % (Maximum 50%)
Pollution Control Credit (19, 24, 33, or 42): % (Maximum 25%)
Total Annual Storm Water Credit (7 + 10 + (19, 24, 33 or 42)): % (Maximum 75%)
Credit Application Approved
Credit Application Not Approved
___________________________________________
Director of Public Works (or designee) (Print Name)
___________________________________________
Director of Public Works (or designee) (Sign Name)
______________________________
Date
Non-Residential Credit Manual 20 2025
Chapter 6: Example Credit Applications
Following are example applications for credit adjustments to the Storm Water Service Charge. The
example application forms have been completed and are attached.
Example #1: Flow Control Structure Credit (per Chapter 3)
A commercial site was developed in December 2002 with an impervious area of 1,200,000 sq. ft., or
426.0 ERUs. A detention pond was installed that meets the design criteria specified in the city’s current
storm water management regulations. The peak runoff rate from the 100-year, 24-hour storm after
development does not exceed the peak runoff rate from the 10-year, 24-hour storm before development.
The customer’s engineer has certified these calculations and the property meets all the other storm water
management requirements in effect at the time of construction. The customer has not installed any other
BMPs on site.
Example #2: Riparian Property Credit (per Chapter 3)
An industrial site with 200,000 SF total impervious area discharges a portion of its runoff directly to the
Fox River. Due to topography on the lot, 70,000 SF of the impervious area discharges directly to the Fox
River, while the runoff from the remaining area flows into the municipal storm water conveyance system.
Example #3: Post-Development Pollution Control Credit (per Chapter 4)
A site was developed in April 2005 with a commercial land use. A detention pond was installed that met
the design criteria specified in the city’s current storm water management regulations. The Total
Suspended Solids (TSS) are substantially reduced from the implementation of a structural pollution
control practice. The customer’s engineer has certified these calculations and the property meets all the
other storm water management requirements in effect at the time of construction. The customer has not
installed any other BMPs on site.
Non-Residential Credit Manual 21 2025
This Page Intentionally Left Blank
Credit Application Example #1: Flow Control Structure
Non-Residential Credit Manual 22 2025
City of Oshkosh Storm Water Utility: Credit Application Form
Form 1 - Storm Water Service Charge Credit Application
Credits Applied for (check all that apply):
Pollution Control
Riparian
Flow Control Structure
Review Fee:
The property owner submitting the credit application shall pay a one-time review fee.
Fees are as follows:
Flow Control Credit Only = $200
Pollution Control Credit Only = $200
Flow Control and Pollution Control Credit = $300
Does the application have a check enclosed? Yes No
Applicant Information (Financially Responsible Entity): (Please print or type)
Name: Commercial Crafts
Address: 100 Oshkosh Boulevard
City: Oshkosh State: WI Zip Code: 54903
Contact: Casey Commercial Email: Casey@Crafts.com Telephone: 920-555-1237
Property Owner Information (If Different from Above):
Name: (Same as Above)
Address:
City: State: Zip Code:
Property Information:
Property Location/Address: 100 Oshkosh Boulevard
Parcel Number: 90112345980 Property Size: (SF/Acre) 30 acres
Receiving Water’s Name (if applicable): N/A Impervious Area (SF): 1,200,000
Brief Description of Storm Water Facilities at Location (if applicable): Detention Basin
Plan Review Information:
Has this project and its storm water calculations been previously approved by the city? Yes No
If Yes, date of final approval of plan and calculations: 1/1/2009
(If no copy is on file, city will notify Applicant to request a copy.)
If No, provide copies of as-built plans and calculations showing the project meets minimum city requirements.
Please indicate the review information that you are attaching to this application:
Narratives Site Plans Survey Plat with
Topography Runoff Calculations
Routing Calculations Stage/Storage/Dischar
ge Tables Outlet Structure
Details As-Built Plans
Operations and
Maintenance Manual SLAMM Calculations
Credit Application Example #1: Flow Control Structure
Non-Residential Credit Manual 23 2025
Certifications:
The above information is true and correct to the best of my knowledge and belief. (This form must be
signed by the financially responsible person if an individual, or if not an individual, by an officer, director,
partner, or registered agent with authority to execute instruments for the financially responsible person). I
agree to provide corrected information should there be any change in the information provided herein.
Casey Commercial Owner
Type or print name Title or Authority
Signature Date
The following certification is required for approval of all credits for which a certified technical
submission was required:
The above information and the information on Form 2 was prepared either by or under the supervision of
myself as the qualified professional and is true and correct to the best of my knowledge and belief.
Ean Engineer WI_PE #12345
Type or print name Professional License Type and Number
920-555-1239
Signature Date Phone
Credit Application Example #1: Flow Control Structure
Non-Residential Credit Manual 24 2025
Form 2 - Storm Water Service Charge Credit Application
(Form 1 must accompany this application form)
(1) Total Gross Impervious Area: 1,200,000 (sq. ft.)
Flow Control Structure (10-year – 24 hour storm event)
All storm water management requirements were met at the time of construction: Yes No
(2) Percent of site’s impervious area draining to Flow Control measure: 100 (%)
(3) Post-Developed 10-year flow without management: 63 (cfs)
(4) Post-Developed 10-year flow with management: 15 (cfs)
(5) Reduction of Flow Provided ((3) - (4)): 48 (cfs)
(6) Percent Reduction ((5)/(3) * 100): 76.2 (%)
(7) Flow Control Credit [((2) *(6))/10,000*50%]: 38.1 (%)
(Maximum is 50%)
Riparian Property Credit
(8) Impervious Area Drainage Directly to Water Body: (sq. ft.)
(9) Percent of Area Drainage Directly to Water Body ((8)/(1) * 100): (%)
(10) Riparian Property Credit ((9)/100*50%): (%)
(Maximum is 50%)
Pollution Control:
All storm water pollution reduction requirements were met at the time of construction: Yes No
A. New Land Development
(11) Post-Developed TSS without management: (lbs)
(12) Post-Developed TSS with management: (lbs)
(13) Reduction of TSS Provided ((11) –(12)): (lbs)
(14) Percent Reduction ((13)/(11) * 100): (%)
(15) Post-Developed TP without management: (lbs)
(16) Post-Developed TP with management: (lbs)
(17) Reduction of TP Provided ((15) –(16)): (lbs)
(18) Percent Reduction ((17)/(15) * 100): (%)
(19) Pollution Control Credit: (%)
If (14) = 80.0%-85.0 % or if (18) = 54%-57% Credit = 0% (Maximum is 25%)
If (14) = 85.1%-90.0 % or if (18) = 57.1%-61% Credit = 20%
If (14) > 90.0% or if (18) > 61% Credit= 25%
B. Redeveloped Lands (prior to January 1, 2026)
(20) Post-Developed TSS without management: (lbs)
(21) Post-Developed TSS with management: (lbs)
(22) Reduction of TSS Provided ((20) –(21)): (lbs)
(23) Percent Reduction ((22)/(20) * 100): (%)
(24) Pollution Control Credit: (%)
If (23) < 40.0 % Credit = 5% (Maximum is 25%)
If (23) = 40.0%-50.0 % Credit = 15%
If (23) > 50.0 % Credit = 25%
Credit Application Example #1: Flow Control Structure
Non-Residential Credit Manual 25 2025
C. Redeveloped Lands (after January 1, 2026)
(25) Post-Developed TSS without management: (lbs)
(26) Post-Developed TSS with management: (lbs)
(27) Reduction of TSS Provided ((25) –(26)): (lbs)
(28) Percent TSS Reduction ((27)/(25) * 100): (%)
(29) Post-Developed TP without management: (lbs)
(30) Post-Developed TP with management: (lbs)
(31) Reduction of TP Provided ((29) –(30)): (lbs)
(32) Percent TP Reduction ((31)/(29) * 100): (%)
(33) Pollution Control Credit: (%)
If (28) < 58.4% and if (32) < 30% Credit = 5% (Maximum is 25%)
If (28) = 58.4%-65% or if (32) = 30%-44% Credit = 15%
If (28) > 65% or if (32) > 44% Credit = 25%
D. Existing Developed Lands (not being redeveloped)
(34) Existing-Developed TSS without management: (lbs)
(35) Existing-Developed TSS with management: (lbs)
(36) Reduction of TSS Provided ((34) –(35)): (lbs)
(37) Percent Reduction ((36)/(34) * 100): (%)
(38) Existing Developed TP without management: (lbs)
(39) Existing Developed TP with management: (lbs)
(40) Reduction of TP Provided ((38) –(39)) (lbs)
(41) Percent TP Reduction ((40)/(38) * 100): (%)
(42) Pollution Control Credit: (%)
If (37) < 10.0 % Credit = 5% (Maximum is 25%)
If (37) = 10.0%-20.0 % Credit = 15%
If (37) > 20.0 % Credit = 25%
Credit Summary
Flow Control Structure Credit (7): 38.1 % (Maximum 50%)
Riparian Property Credit (10): 0 % (Maximum 50%)
Pollution Control Credit (19, 24, 33, or 38): 0 % (Maximum 25%)
Total Annual Storm Water Credit (7 + 10 + (19, 24, 33 or 38)): 38.1 % (Maximum 75%)
Credit Application Approved
Credit Application Not Approved
___________________________________________
Director of Public Works (or designee) (Print Name)
___________________________________________
Director of Public Works (or designee) (Sign Name)
______________________________
Date
Credit Application Example #2: Riparian
Non-Residential Credit Manual 26 2025
City of Oshkosh Storm Water Utility: Credit Application Form
Form 1 - Storm Water Service Charge Credit Application
Credits Applied for (check all that apply):
Pollution Control
Riparian
Flow Control Structure
Review Fee:
The property owner submitting the credit application shall pay a one-time review fee.
Fees are as follows:
Flow Control Credit Only = $200
Pollution Control Credit Only = $200
Flow Control and Pollution Control Credit = $300
Does the application have a check enclosed? Yes No
Applicant Information (Financially Responsible Entity): (Please print or type)
Name: Oshkosh Industries
Address: 1000 Oshkosh Avenue
City: Oshkosh State: WI Zip Code: 54903
Contact: Isaac Industrial Email: Isaac@Ind.com Telephone: 920-555-1234
Property Owner Information (If Different from Above):
Name: (Same as Above)
Address:
City: State: Zip Code:
Property Information:
Property Location/Address: 1000 Oshkosh Avenue
Parcel Number: 90112345670 Property Size: (SF/Acre) 5 acres
Receiving Water’s Name (if applicable): Fox River Impervious Area (SF): 200,000
Brief Description of Storm Water Facilities at Location (if applicable):
Plan Review Information:
Has this project and its storm water calculations been previously approved by the city? Yes No
If Yes, date of final approval of plan and calculations:
(If no copy is on file, city will notify Applicant to request a copy.)
If No, provide copies of as-built plans and calculations showing the project meets minimum city requirements.
Please indicate the review information that you are attaching to this application:
Narratives Site Plans Survey Plat with
Topography Runoff Calculations
Routing Calculations Stage/Storage/Dischar
ge Tables Outlet Structure
Details As-Built Plans
Operations and
Maintenance Manual SLAMM Calculations
Credit Application Example #2: Riparian
Non-Residential Credit Manual 27 2025
Certifications:
The above information is true and correct to the best of my knowledge and belief. (This form must be
signed by the financially responsible person if an individual, or if not an individual, by an officer, director,
partner, or registered agent with authority to execute instruments for the financially responsible person). I
agree to provide corrected information should there be any change in the information provided herein.
Isaac Industrial President
Type or print name Title or Authority
Signature Date
The following certification is required for approval of all credits for which a certified technical
submission was required:
The above information and the information on Form 2 was prepared either by or under the supervision of
myself as the qualified professional and is true and correct to the best of my knowledge and belief.
Susan Surveyor WI-RLS #12345
Type or print name Professional License Type and Number
920-555-1235
Signature Date Phone
Credit Application Example #2: Riparian
Non-Residential Credit Manual 28 2025
Form 2 - Storm Water Service Charge Credit Application
(Form 1 must accompany this application form)
(1) Total Gross Impervious Area: 200,000 (sq. ft.)
Flow Control Structure (10-year – 24 hour storm event)
All storm water management requirements were met at the time of construction: Yes No
(2) Percent of site’s impervious area draining to Flow Control measure: (%)
(3) Post-Developed 10-year flow without management: (cfs)
(4) Post-Developed 10-year flow with management: (cfs)
(5) Reduction of Flow Provided ((3) - (4)): (cfs)
(6) Percent Reduction ((5)/(3) * 100): (%)
(7) Flow Control Credit [((2) *(6))/10,000*50%]: (%)
(Maximum is 50%)
Riparian Property Credit
(8) Impervious Area Drainage Directly to Water Body: 70,000 (sq. ft.)
(9) Percent of Area Drainage Directly to Water Body ((8)/(1) * 100): 35 (%)
(10) Riparian Property Credit ((9)/100*50%): 17.5 (%)
(Maximum is 50%)
Pollution Control:
All storm water pollution reduction requirements were met at the time of construction: Yes No
A. New Land Development
(11) Post-Developed TSS without management: (lbs)
(12) Post-Developed TSS with management: (lbs)
(13) Reduction of TSS Provided ((11) –(12)): (lbs)
(14) Percent Reduction ((13)/(11) * 100): (%)
(15) Post-Developed TP without management: (lbs)
(16) Post-Developed TP with management: (lbs)
(17) Reduction of TP Provided ((15) –(16)): (lbs)
(18) Percent Reduction ((17)/(15) * 100): (%)
(19) Pollution Control Credit: (%)
If (14) = 80.0%-85.0 % or if (18) = 54%-57% Credit = 0% (Maximum is 25%)
If (14) = 85.1%-90.0 % or if (18) = 57.1%-61% Credit = 20%
If (14) > 90.0% or if (18) > 61% Credit= 25%
B. Redeveloped Lands (prior to January 1, 2026)
(20) Post-Developed TSS without management: (lbs)
(21) Post-Developed TSS with management: (lbs)
(22) Reduction of TSS Provided ((20) –(21)): (lbs)
(23) Percent Reduction ((22)/(20) * 100): (%)
(24) Pollution Control Credit: (%)
If (23) < 40.0 % Credit = 5% (Maximum is 25%)
If (23) = 40.0%-50.0 % Credit = 15%
If (23) > 50.0 % Credit = 25%
Credit Application Example #2: Riparian
Non-Residential Credit Manual 29 2025
C. Redeveloped Lands (after January 1, 2026)
(25) Post-Developed TSS without management: (lbs)
(26) Post-Developed TSS with management: (lbs)
(27) Reduction of TSS Provided ((25) –(26)): (lbs)
(28) Percent Reduction ((27)/(25) * 100): (%)
(29) Post-Developed TP without management: (lbs)
(30) Post-Developed TP with management: (lbs)
(31) Reduction of TP Provided ((29) –(30)): (lbs)
(32) Percent Reduction ((31)/(29) * 100): (%)
(33) Pollution Control Credit: (%)
If (28) < 58.4% and if (32) < 30% Credit = 5% (Maximum is 25%)
If (28) = 58.4%-65% or if (32) = 30%-44% Credit = 15%
If (28) > 65% or if (32) > 44% Credit = 25%
D. Existing Developed Lands (not being redeveloped)
(34) Existing-Developed TSS without management: (lbs)
(35) Existing-Developed TSS with management: (lbs)
(36) Reduction of TSS Provided ((34) –(35)): (lbs)
(37) Percent Reduction ((36)/(34) * 100): (%)
(38) Existing Developed TP without management: (lbs)
(39) Existing Developed TP with management: (lbs)
(40) Reduction of TP Provided ((38) –(39)) (lbs)
(41) Percent TP Reduction ((40)/(38) * 100): (%)
(42) Pollution Control Credit: (%)
If (37) < 10.0 % Credit = 5% (Maximum is 25%)
If (37) = 10.0%-20.0 % Credit = 15%
If (37) > 20.0 % Credit = 25%
Credit Summary
Flow Control Structure Credit (7): 0 % (Maximum 50%)
Riparian Property Credit (10): 17.5 % (Maximum 50%)
Pollution Control Credit (19, 24, 33, or 38): 0 % (Maximum 25%)
Total Annual Storm Water Credit (7 + 10 + (19, 24, 33 or 38)): 17.5 % (Maximum 75%)
Credit Application Approved
Credit Application Not Approved
___________________________________________
Director of Public Works (or designee) (Print Name)
___________________________________________
Director of Public Works (or designee) (Sign Name)
______________________________
Date
Credit Application Example #3: Pollution Control
Non-Residential Credit Manual 30 2025
City of Oshkosh Storm Water Utility: Credit Application Form
Form 1 - Storm Water Service Charge Credit Application
Credits Applied for (check all that apply):
Pollution Control
Riparian
Flow Control Structure
Review Fee:
The property owner submitting the credit application shall pay a one-time review fee.
Fees are as follows:
Flow Control Credit Only = $200
Pollution Control Credit Only = $200
Flow Control and Pollution Control Credit = $300
Does the application have a check enclosed? Yes No
Applicant Information (Financially Responsible Entity): (Please print or type)
Name: Commercial Crafts
Address: 100 Oshkosh Boulevard
City: Oshkosh State: WI Zip Code: 54903
Contact: Casey Commercial Email: Casey@Crafts.com Telephone: 920-555-1237
Property Owner Information (If Different from Above):
Name: (Same as Above)
Address:
City: State: Zip Code:
Property Information:
Property Location/Address: 100 Oshkosh Boulevard
Parcel Number: 90112345980 Property Size: (SF/Acre) 30 Acres
Receiving Water’s Name (if applicable): N/A Impervious Area (SF): 1,200,000
Brief Description of Storm Water Facilities at Location (if applicable): Detention Basin
Plan Review Information:
Has this project and its storm water calculations been previously approved by the city? Yes No
If Yes, date of final approval of plan and calculations:
(If no copy is on file, city will notify Applicant to request a copy.)
If No, provide copies of as-built plans and calculations showing the project meets minimum city requirements.
Please indicate the review information that you are attaching to this application:
Narratives Site Plans Survey Plat with
Topography Runoff Calculations
Routing Calculations Stage/Storage/Dischar
ge Tables Outlet Structure
Details As-Built Plans
Operations and
Maintenance Manual SLAMM Calculations
Credit Application Example #3: Pollution Control
Non-Residential Credit Manual 31 2025
Certifications:
The above information is true and correct to the best of my knowledge and belief. (This form must be
signed by the financially responsible person if an individual, or if not an individual, by an officer, director,
partner, or registered agent with authority to execute instruments for the financially responsible person). I
agree to provide corrected information should there be any change in the information provided herein.
Casey Commercial Owner
Type or print name Title or Authority
Signature Date
The following certification is required for approval of all credits for which a certified technical
submission was required:
The above information and the information on Form 2 was prepared either by or under the supervision of
myself as the qualified professional and is true and correct to the best of my knowledge and belief.
Ean Engineer WI-PE #12345
Type or print name Professional License Type and Number
920-555-1239
Signature Date Phone
Credit Application Example #3: Pollution Control
Non-Residential Credit Manual 32 2025
Form 2 - Storm Water Service Charge Credit Application
(Form 1 must accompany this application form)
(1) Total Gross Impervious Area: 1,200,000 (sq. ft.)
Flow Control Structure (10-year – 24 hour storm event)
All storm water management requirements were met at the time of construction: Yes No
(2) Percent of site’s impervious area draining to Flow Control measure: (%)
(3) Post-Developed 10-year flow without management: (cfs)
(4) Post-Developed 10-year flow with management: (cfs)
(5) Reduction of Flow Provided ((3) - (4)): (cfs)
(6) Percent Reduction ((5)/(3) * 100): (%)
(7) Flow Control Credit [((2) *(6))/10,000*50%]: (%)
(Maximum is 50%)
Riparian Property Credit
(8) Impervious Area Drainage Directly to Water Body: (sq. ft.)
(9) Percent of Area Drainage Directly to Water Body ((8)/(1) * 100): (%)
(10) Riparian Property Credit ((9)/100*50%): (%)
(Maximum is 50%)
Pollution Control:
All storm water pollution reduction requirements were met at the time of construction: Yes No
A. New Land Development
(11) Post-Developed TSS without management: (lbs)
(12) Post-Developed TSS with management: (lbs)
(13) Reduction of TSS Provided ((11) –(12)): (lbs)
(14) Percent Reduction ((13)/(11) * 100): (%)
(15) Post-Developed TP without management: (lbs)
(16) Post-Developed TP with management: (lbs)
(17) Reduction of TP Provided ((15) –(16)): (lbs)
(18) Percent Reduction ((17)/(15) * 100): (%)
(19) Pollution Control Credit: (%)
If (14) = 80.0%-85.0 % or if (18) = 54%-57% Credit = 0% (Maximum is 25%)
If (14) = 85.1%-90.0 % or if (18) = 57.1%-61% Credit = 20%
If (14) > 90.0% or if (18) > 61% Credit= 25%
B. Redeveloped Lands (prior to January 1, 2026)
(20) Post-Developed TSS without management: (lbs)
(21) Post-Developed TSS with management: (lbs)
(22) Reduction of TSS Provided ((20) –(21)): (lbs)
(23) Percent Reduction ((22)/(20) * 100): (%)
(24) Pollution Control Credit: (%)
If (23) < 40.0 % Credit = 5% (Maximum is 25%)
If (23) = 40.0%-50.0 % Credit = 15%
If (23) > 50.0 % Credit = 25%
Credit Application Example #3: Pollution Control
Non-Residential Credit Manual 33 2025
C. Redeveloped Lands (after January 1, 2026)
(25) Post-Developed TSS without management: (lbs)
(26) Post-Developed TSS with management: (lbs)
(27) Reduction of TSS Provided ((25) –(26)): (lbs)
(28) Percent Reduction ((27)/(25) * 100): (%)
(29) Post-Developed TP without management: (lbs)
(30) Post-Developed TP with management: (lbs)
(31) Reduction of TP Provided ((29) –(30)): (lbs)
(32) Percent Reduction ((31)/(29) * 100): (%)
(33) Pollution Control Credit: (%)
If (28) < 58.4% and if (32) < 30% Credit = 5% (Maximum is 25%)
If (28) = 58.4%-65% or if (32) = 30%-44% Credit = 15%
If (28) > 65% or if (32) > 44% Credit = 25%
D. Existing Developed Lands (not being redeveloped)
(34) Existing-Developed TSS without management: 4,000 (lbs)
(35) Existing-Developed TSS with management: 3,000 (lbs)
(36) Reduction of TSS Provided ((34) –(35)): 1,000 (lbs)
(37) Percent Reduction ((36)/(34) * 100): 25 (%)
(38) Existing Developed TP without management: (lbs)
(39) Existing Developed TP with management: (lbs)
(40) Reduction of TP Provided ((38) –(39)) (lbs)
(41) Percent TP Reduction ((40)/(38) * 100): (%)
(42) Pollution Control Credit: 25 (%)
If (37) < 10.0 % Credit = 5% (Maximum is 25%)
If (37) = 10.0%-20.0 % Credit = 15%
If (37) > 20.0 % Credit = 25%
Credit Summary
Flow Control Structure Credit (7): 0 % (Maximum 50%)
Riparian Property Credit (10): 0 % (Maximum 50%)
Pollution Control Credit (19, 24, 33, or 38): 25 % (Maximum 25%)
Total Annual Storm Water Credit (7 + 10 + (19, 24, 33 or 38)): 25 % (Maximum 75%)
Credit Application Approved
Credit Application Not Approved
___________________________________________
Director of Public Works (or designee) (Print Name)
___________________________________________
Director of Public Works (or designee) (Sign Name)
______________________________
Date