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Stormwater Facility Credit Calculator
SPU has developed a “credit calculator” that is the formula that will be used to calculate the percentage credit for each eligible parcel that has applied for such a credit on its drainage bill. In this credit calculator, SPU has assigned a uniform percentage credit for each type of approved stormwater management facility based on a weighting of the stormwater performance goals the facility satisfies and that are applicable to the appropriate drainage discharge point for that parcel. The credit calculator then considers information specific to the parcel (entered into the calculator by SPU), such as the percentage of the parcel’s impervious surface managed by the approved facility and the parcel’s drainage rate category assignment.
The output of the credit calculator is a percentage credit, which may not exceed a maximum percentage, as specified in the SMC 21.33.040. The credit is then applied as a percentage discount off the customer’s annual drainage bill for the parcel.
View the Credit Calculator (PDF) or learn more on how to apply for a credit.
Questions? Please contact the program manager at spustormwaterfacilitycredit@seattle.gov or (206) 684-4150.
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