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Residential Stormwater Credit Program DRAFT ver2 Purpose: The purpose of the Stormwater Credit Program is to encourage city property owners to manage rainwater in ways that help deal with problems arising from stormwater runoff in an urban environment. In Roseville, the large amount of impervious surfaces such as asphalt, concrete, roofs, sidewalks, etc., stop stormwater from naturally absorbing into the ground. The runoff from these areas transports pollutants like phosphorus, nitrogen, heavy metals, petrochemicals, fertilizer, pet waste and other common chemicals to receiving bodies of water and this is a major source of water pollution in urban areas. In an urban environment, the amount of impervious area on a property is the most significant factor affecting the quality and quantity of stormwater runoff. By using stormwater Best Management Practices (BMPs) property owners can partially duplicate the effect of the open areas and wetlands that provided natural drainage prior to urbanization. The program offers Residential Property owners 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. 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 Area Treated Credit % Annual Fee Reduction New Annual 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: 19 March 2014 R: \PublicWorks\ Engineering\ Drainage \Storm WaterUtility \Stormwater Credit Memo Draft ver2.docx