Municipal Separate Storm Sewer Systems
Issuance of Final National Pollutant Discharge Elimination System (NPDES) General Permit
On April 4, 2016, EPA issued the final National Pollutant Discharge Elimination System (NPDES) General Permit for stormwater discharges from Small Municipal Separate Storm Sewer Systems (MS4) to certain waters of Massachusetts. The final permit replaces the 2003 small MS4 General Permit and establishes Notice of Intent (NOI) requirements, prohibitions, and management practices for stormwater discharges from small MS4s in Massachusetts. The Massachusetts small MS4 General Permit shall become effective on July 1, 2017, and in order to obtain authorization to discharge, operators must submit a complete and accurate NOI on or before September 29, 2017 (90 days from the effective date of the permit).
Eligible cities and towns will be required to:
For additional information or help with meeting the requirements of the MS4 General Permit, please contact ES&M at 508-226-1800 or at email@example.com
Key Points of New MS4 General Permit
To improve the effectiveness of stormwater management programs and reduce the adverse effects of stormwater runoff to receiving waters, the MS4 General Permit includes:
The IDDE program requires that catchment systems be mapped, assessed, and sampled. The draft permit provides guidance to determine when and how to collect stormwater samples, and how to effectively prioritize catchments that may require improvements. Specialized sampling requirements apply to receiving waters with TMDL waste load allocations.