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​Stormwater Quality​

The MS4 Permit issued by the Colorado Department of Health and Environment to the city of Thornton authorizes the city to discharge stormwater in accordance the city's stormwater program. The Program Description Document (PDD) provides an overview of the stormwater program, please click here to view the document. As required by the permit, residents of the city of Thornton may review and summit comments on the PDD. The review and comment period begins March 4, 2019 and ends March 31, 2019. Please submit your comment by email at or mail your comments to Stormwater Compliance, 12450 Washington Street, Thornton, CO 80241.