MS4 Stormwater Permit

The Town of Winchester is required to comply with the requirements of the 2016 NPDES Phase II Municipal Separate Storm Sewer System (MS4) General Permit.  The Permit requirements include the development, implementation, and enforcement of a Stormwater Management Program to reduce the discharge of pollutants to the MS4 to the maximum extent practicable.  The 2016 MS4 Permit became effective on July 1, 2018. 

The objectives of the permit are accomplished through the implementation of Best Management Practices (BMPs) for the following six minimum control measures.

• Public education and outreach;
• Public involvement and participation;
• Illicit Discharge Detection and Elimination (IDDE) Program;
• Construction site stormwater runoff control;
• Post-construction stormwater management in new development or redevelopment; and
• Good housekeeping and pollution prevention for permittee-owned facilities

Stormwater Management Plan (SWMP)

• Final SWMP - June 2020
• Final SWMP - June 2019 (PDF)
• SWMP - Updated June 2021

Public Education Material

• Pet Waster Flyer (PDF)
• Stormwater Education Flyer (PDF)