Stormwater Utility Fee: Credits & Adjustments

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Stormwater runoff has become a serious problem in both urban and rural areas, affecting water quality and soil erosion. A stormwater utility fee is charged to support storm sewer inspection, cleaning, maintenance/repair of the City’s storm/surface water pipes and public education.

Commercial or non-residential property owners who believe that the amount of impervious surface area or the number of living units on their property needs to be changed may be eligible for an adjustment to stormwater fee. Adjustments can also be requested for changes in property ownership.

Customers may be eligible for a CREDIT if one or more of the following apply:

Peak Flow Control – TYPE I. The parcel has facilities in place to temporarily store stormwater runoff from the property, sufficient to reduce the peak discharge rate of flow released from the site.

Runoff Volume Reduction Credit – TYPE II. The parcel has facilities or controls in place that infiltrate a volume of runoff equal to or greater than the ‘Recharge Volume – Re v’ as defined in the Iowa Stormwater Management Manual.

Water Quality – TYPE III. The parcel has facilities or controls in place that reduce the amount of total suspended solids (TSS) discharged in runoff, as compared to no controls.

Customers may be eligible for an ADJUSTMENT if one or more of the following apply:

(1) The property is classified as nonresidential, and the owner can show that the cumulative impervious area on the parcel is less than half of the impervious area of one ERU, in which case the number of ERUs assigned to the property may be reduced to zero, and the service charged waived.

(2) The property is classified as non-residential and the customer can show that the number of ERUs allocated to their property is incorrect, based on the measurement of impervious area.

(3) The property is classified as residential and the customer can show that the number of living units allocated to their property is incorrect.

Applying for a Credit or Adjustment:

Customers must apply for credits and adjustments separately. Changes to customer charges, whether the result of a credit or an adjustment, are made separately and in the order granted.

The fee for storm water utility credit and adjustment applications received on or after the effective date of Chapter 157: Stormwater Utility shall be $50 for credit applications and $25 for adjustment applications.

Application fees for all applications that result in the approval of a credit or adjustment shall receive a 100% refund. 


Committee members will be responsible for evaluating applications for credits and/or adjustments for non-residential properties and establishing a recommendation to the City Engineer for consideration.

Customers that receive credits that would provide for a modified fee due to a credit or adjustment above the $133.71 fee cap would see no change in their monthly fee.

Within thirty (30) days of the submission of a request to the City Engineer for a credit or an adjustment, the City Engineer shall issue a written decision as to whether the request for adjustment, as determined by the Committee, should be granted, denied or granted in part. The written decision shall also set forth the reason or reasons for such decision. The decision shall be sent to the customer by certified mail, and a copy to the City Manager.

If an appeal is requested, the City Manager shall determine whether the Committee’s decision should be approved, rejected, or modified. The customer shall be allowed to present additional written evidence. The final determination of the City Manager shall be in writing and set forth, in detail, the reason or reasons for the decision and shall inform the customer by certified mail.

If you believe you are eligible for a credit or adjustment to your stormwater fee, please complete the Stormwater Utility Fee Credit/Adjustment Application and return it to the City of Marion Engineering Department. Your application will be reviewed by City staff and the Stormwater Credit Committee to determine the appropriate action for your property.

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