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Learn More about Combined Sewer Overflow (CSO) at Control Planning Meeting, Thursday, December 15

Somerville, Cambridge, and Massachusetts Water Resources Authority Hosting Joint Virtual Event at 6 p.m.

The City of Somerville, the City of Cambridge, and the Massachusetts Water Resources Authority (MWRA) invite you to a virtual public meeting on Thursday, December 15, to discuss improving water quality in our rivers through the development of an updated Combined Sewer Overflow (CSO) Control Plan. Meeting interpretation will be available into Arabic, Amharic, Bengali, Nepalese, Mandarin, Spanish, Portuguese, Haitian Creole. The presentation materials and the recording will be made available following the meeting. 

Register to attend today via 

A combined sewer overflow (CSO) occurs when a large rainstorm overwhelms a combined sewer system, causing stormwater to mix with wastewater (or sewage) and discharge to a nearby river or lake. Somerville, Cambridge, and the MWRA are collaborating on long-term plans to minimize CSOs in our region. Feedback from residents will be an important part of developing those plans.  

Presenters will share how Somerville, Cambridge, and the MWRA are using climate change predictions to prepare infrastructure for future storms, as well as general information, and answer attendees’ questions. 


Persons with disabilities who need auxiliary aids and services for effective communication (i.e., CART, ASL), written materials in alternative formats, or reasonable modifications in policies and procedures in order to access the programs, activities, and meetings of the City of Somerville should please contact Adrienne Pomeroy at 617-625-6600 x 2059 or 

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