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Urbanization has the potential to significantly impact the the ecological health of our waterways. The City of Longmont's Stormwater Quality Program is tasked with helping to protect the rivers, lakes and streams that flow through our community.

Municipal Separate Storm Sewer System (MS4)

The City of Longmont owns and operates a complex storm drainage system known as a Municipal Separate Storm Sewer System. It is designed to efficiently transport rain water and snow melt away from our homes and streets, into the inlets and grates located around the city - ultimately flowing into the surface waters – rivers, creeks, and streams – that run through town.

This runoff water tends to collect common pollutants found in our streets, our rights-of-way, and often even our personal property. Pet waste, yard waste (like leaves), motor oil, car wash runoff, paint, sediment, garbage, and other pollutants all have the potential to flow untreated through our storm sewer system, into the City’s surface waters. This can have a significant impact on surface water quality, threatening the health of our environment, wildlife and residents, as well as our ability to safely recreate in these waterways.

The City of Longmont’s Stormwater Quality Program is here to help.

The River Starts Here!

H2O Joe and Flo MascotsProtecting our waterways from pollution requires a concerted effort on the part of the entire Longmont community. Businesses large and small, home owners associations, contractors, developers, and even individual residents all have a role to play in preserving and protecting this essential community resource. Whether you are a concerned resident, a conscientious businessperson, or a responsible developer, you can help protect our surface waters! Please see the links below for all City of Longmont Stormwater Quality Program sites and information.

Program description document available upon request.

Click here to visit Keep It Clean

The City of Longmont is a partner in the Keep It Clean Partnership. See their website for more information on water pollution. 



If you have questions or concerns about the City of Longmont's Stormwater Quality Program, please contact Environmental Services.

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