Stormwater Systems & Environmental Affairs


Storm Utility b

Typical Stormwater, found in the City’s storm drain system is water from precipitation that flows across the ground and pavement when it rains, snows, or when ice melts. The water seeps into the ground or drains into what we call storm sewers. These are the drains you see at street corners or at low points on the sides of your streets. Collectively, the draining water is called stormwater runoff and is a concern to us in commercial and industrial sites, as well as your neighborhood, because of the pollutants it carries. Stormwater is not treated before entering the city storm sewers, therefore all of the untreated stormwater flows directly into the Yellowstone River.

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Yellowstone River Intakes and Outfalls MapStormwater System Map

According to the 1996 National Water Quality Inventory, stormwater runoff is a leading source of water pollution. Stormwater runoff can harm surface waters such as rivers, lakes, and streams which in turn cause or contribute to water quality standards being exceeded. Stormwater runoff can change natural hydrologic patterns, accelerate stream flows, destroy aquatic habitats, and elevate pollutant concentrations and loadings. Development substantially increases impervious surfaces thereby increasing runoff from city streets, driveways, parking lots, and sidewalks, on which pollutants from human activities settle.

Common pollutants in runoff include pesticides, fertilizers, oils, metals, pathogens, salt, sediment, litter and other debris are transported via stormwater and discharged - untreated - to water resources through storm sewer systems.

Resolution 20-10888 FY 2021 Storm Sewer Fees

Have a concern or a question? Let us know with convenient online reporting & request forms:

Contact Us | Storm Sewer Reporting | Stormwater Construction Site Complaint Reporting

  1. Environmental Affairs Office