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LOT BASED PROPERTIES (SINGLE FAMILY & DUPLEX RESIDENTIAL) Lot based uses receive up to a 50% credit to their annual stormwater fee based on the percentage of their impervious surface they disconnect from the city infrastructure based on the volume from a 1" rainfall. Only the drainage area that is treated will be eligible for credit. This program does not provide credits for practices that are required by a permit. Practices that go above and beyond the permit are eligible for stormwater credits. Property owners that receive cost share funding from a watershed district, state agency, etc., are eligible for the stormwater credit program. Below is a partial list of stormwater BMPs approved for use in the Stormwater Credits Program: Raingardens, pervious pavers, wet ponds, dry wells, sand filters, filter strips, infiltration trenches, green roofs The installed BMP's will be certified by the property owner, or agent of the property owner, to show that the BMP is still functioning as designed. Certification will need to be provided, at a minimum, every 5 years after the city has approved the project. The following credit will be applied to the area treated: STORM WATER UTILITY CREDIT FOR LOT BASED USES Impervious Area Treated (% of lot) Credit % 25% 12.5% 50% 25% 75% 37.5% 100% 50% Example: In 2014, a single family residential property has an annual stormwater fee of $46.80. The property owner adds a raingarden sized to capture the volume from a 1" rainfall. The amount of impervious area they treat as a percentage of their property will dictate the stormwater credit they will receive annually. Below is the breakdown based on the percent of impervious area they capture: Annual Stormwater Fee $46.80 Impervious Annual Fee New Annual Area Treated Credit % Reduction Stormwater Fee 25% 12.5% $5.85 $40.95 50% 25% $11.70 $35.10 75% 37.5% $17.55 $29.25 100% 50% $23.40 $23.40 Updated: 25 April 2014 R:\PublicWorks\Engineering\Drainage\StormWaterUtility\Stormwater Credit Program.docx