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MS4 Permit

Municipal Separate Storm Sewer System (MS4) Permit

Municipal Separate Storm Sewer System (MS4) Permit

"A river is the report card for its watershed."


The City’s storm drainage system serves a dual purpose: to prevent property flooding by directing stormwater into local creeks and the Cache la Poudre River and to protect these water bodies from pollutants commonly present in an urban environment.

According to the EPA, stormwater pollution is the number one source of water pollution in the country. To minimize pollutants transported by stormwater runoff into the storm sewer system and downstream receiving waters, the City implements programs in accordance with its Colorado Discharge Permit System MS4 Permit. TVM0cGVybWl0QGZjZ292LmNvbQ==

Programs include:

  • Illicit discharge detection and elimination – spill response program
  • Pollution prevention and good housekeeping for municipal operations

A Program Description Document is available to the public for review and comment by contacting: TVM0cGVybWl0QGZjZ292LmNvbQ==