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Boston Water & Sewer Commission (BWSC)



The Boston Water and Sewer Commission (BWSC) was issued National Pollutant Discharge Elimination System (NPDES) Permit MAS010001, which became effective on October 29, 1999, authorizing stormwater and allowable non-stormwater discharges from its municipal separate storm sewer system (MS4). The permit expired five years later on October 30, 2004; however, EPA administratively continued the permit as allowed by regulation.


EPA is currently preparing a draft permit and fact sheet (which provides EPA's technical basis for establishing permit conditions) to replace the expired permit. In the development of the draft permit, EPA has examined the status of the City of Boston as an owner or operator of a regulated MS4 and is intending to include the City of Boston as a co-permittee in the draft permit.

EPA is considering new and necessary enhancements to best management practices (BMPs) to include in the permit to reduce stormwater pollutant loadings to the MS4 and receiving waters. As required by regulation, BMPs are based on measures to reduce pollution to the maximum extent practicable, attain state water quality standards, and support achievement of applicable waste load allocations included in EPA-approved Total Maximum Daily Loads (TMDLs) developed for the Charles River and the Neponset River. EPA is also considering changes to existing permit requirements for outfall and receiving waters monitoring, as well as various other updates to the Stormwater Management Program.

  • Any person who wishes to receive information regarding this permitting process should send their contact information to Glenda Velez ( with "Draft Boston MS4 Information Request" indicated in the subject line.

  • Once final, a notice of availability of the draft permit and fact sheet will be published in the Federal Register, posted on EPA's website, and mailed directly to the Boston Water and Sewer Commission and the City of Boston, as appropriate. EPA will solicit comment on the draft permit during a public notice period of at least thirty (30) days.

Newton Tedder (
Tel: (617) 918-1038

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