MWRA Regulation Revision

This spring, the Massachusetts Water Resources Authority (MWRA) will be issuing revised Sewer Use regulations (360 CMR 10.000) for public comment. MWRA is the largest provider of wastewater services in the Commonwealth, serving 43 communities, primarily in the greater Boston Metropolitan area, but also extending to other portions of the state. Included in these revisions is a new permit category for dental practices- the Dental Discharges Group Permit. In December of 2019, dental practices in MWRA’s service area may be required to apply for the new Dental Discharges permit. 

MWRA has created this new Dental Discharges permit in order to comply with new U.S. Environmental Protection Agency (EPA) pretreatment standards for reducing discharges of mercury from dental operations to Publically Owned Treatment Works (POTW) (40 CFR 441).

This webinar will review MWRA’s proposed Dental Discharges Group Permit as well as a One-Time Compliance Report that all dental practices in MWRA’s service area will receive in early April and must complete. This One-Time Compliance Report will determine whether or not a dental practice will be covered under MWRA’s Dental Discharges Group Permit.

The following towns will be affected: Arlington, Ashland, Bedford, Belmont, Boston, Braintree, Brookline, Burlington, Cambridge, Canton, Chelsea, Clinton, Dedham, Everett, Framingham, Hingham, Holbrook, Lancaster, Lexington, Malden, Marblehead, Medford, Melrose, Milton, Nahant, Needham, Newton, Norwood, Quincy, Randolph, Reading, Revere, Somerville, Stoneham, Stoughton, Swampscott, Wakefield, Walpole, Waltham, Watertown, Wellesley, Westwood, Weymouth, Wilmington, Winchester, Winthrop, and Woburn.

For information regarding MWRA’s Sewer District, visit:
For information regarding MWRA’s Toxic Reduction and Control Department, including links to the current Sewer Use regulations, visit:
For information regarding EPA’s pretreatment standards for dental operations, visit:

Rebecca Weidman, Director, Toxic Reduction and Control, Massachusetts Water Resources Authority
Peter J. Yarossi, Senior Program Manager, Toxic Reduction and Control, Massachusetts Water Resources Authority

Recorded April 24, 2019.

View Webinar Recording

Webinar Resources

help desk software