Stormwater Management Program (SWMP) Plan

Lynnfield is one of many Massachusetts communities regulated under the Environmental Protection Agency’s (USEPA) National Pollutant Discharge Elimination System (NPDES) Phase II rule (40 CFR 122).

The rule requires regulated operators of municipal separate storm sewer systems (MS4) to develop a Stormwater Management Program (SWMP) and Best Management Practices (BMPs) to reduce the impacts of stormwater discharges. The requirements are outlined in the NPDES General Permits for Stormwater Discharges from Small Municipal Separate Storm Sewer Systems (MS4s) in Massachusetts, which was signed on April 4, 2016, with an effective date of July 1, 2018, hereinafter referred to as the 2016 MS4 Permit.  
 
The SWMP Plan describes and details the activities and measures that will be implemented to meet the terms and conditions of the permit. 

The most recent update to the SWMP Plan is shown below.