This Stormwater Management Plan (SWMP) is required under U.S. Environmental Protection Agency (U.S. EPA) Phase II stormwater regulations, promulgated under the Federal Clean Water Act (CWA). These regulations require the City of Portland to obtain coverage under a National Pollutant Discharge Elimination System (NPDES) permit. The permit covers stormwater discharges associated with the municipality’s separate storm sewer system (MS4) and requires the city to report annually on its progress. The latest stormwater permit issued by TDEC is valid from February 8, 2017 through September 30, 2021.
U.S. EPA’s Stormwater Phase II Final Rule establishes that an MS4 stormwater management program is intended to improve the quality of the nation’s waterways. Common stormwater pollutants include oil and grease from roadways and parking lots, pesticides, herbicides and fertilizers from lawns, sediment from construction sites and trash. Pollutants are deposited into waterways, impacting beneficial uses of the resources, and interfering with the habitat for fish, aquatic organisms, and wildlife.
The purpose of the SWMP is to identify pollutant sources potentially affecting the quality and quantity of stormwater discharges, to provide Best Management Practices (BMPs) for municipal and development activities, and to provide measurable goals to assess the effectiveness of implemented BMPs.
Click the link below to view the Stormwater Management Plan (SWMP)
