Agenda Summary
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Opposing the draft combined sewer overflow long-term control plan and calling for a regional solution.
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Official Text
WHEREAS: Combined Sewer Overflows (CSOs) occur when wet weather overwhelms the capacity of combined sewer and stormwater systems, causing millions of gallons of untreated wastewater-including raw human waste and harmful pathogens-to be discharged into Alewife Brook annually; and
WHEREAS: These discharges create a public health hazard, degrade our parkland and paths, and pollute our waterways and have an outsized impact on environmental justice communities; and
WHEREAS: This problem is regional in origin and scope, and it demands a regional response. Every community in the MWRA sewer district sends its sewage to the Deer Island Treatment Plant, so all share pipes, pumps, and treatment capacity. During large storms, the regional sewer system fills up downstream of the Alewife CSO outfalls, between the Alewife Brook Pump Station and the Chelsea Creek Headworks and between there and the Deer Island Wastewater Treatment Plant. Once the system downstream is at capacity, the combined sewage overflows into the Alewife Brook; and
WHEREAS: The shared sewer infrastructure serving Somerville is also used by many upstream municipalities in the region and flows from these communities, particularly those without fully separated sewers, contribute directly to Somerville CSOs; and
WHEREAS: The MWRA Enabling Act of 1984 mandates the “repair, replacement, rehabilitation, modernization and extension” of the sewer system, “in the best interests of the commonwealth and its inhabitants, to promote the general health and welfare, to improve commerce and living conditions of the citizenry,” and the Legislature provided MWRA with a funding mechanism to pay for those improvements; and
WHEREAS: The city of Somerville and the city of Cambridge should not bear a disproportionate share of the cost to address a regional problem; and
WHEREAS: This region has a once-in-a-generation opportunity to rectify these long-standing conditions and ensure that future generations are not burdened with inadequate and unsafe infrastructure. If approached regionally, we could implement solutions that could drastically reduce future sewage overflows, be resilient to climate change and protect the health of our communities and provide much-needed access to recreation and open space; and
WHEREAS: In April 2026, the Massachusetts Water Resources Authority (MWRA), the City of Cambridge, and the City of Somerville released a Draft Updated CSO Long-Term Control Plan (LTCP) for the Charles River, Alewife Brook, and Upper Mystic River basins. The final version of this LTCP will ultimately be submitted to the Massachusetts Environmental Policy Act Office (MEPA) and the Massachusetts Department of Environmental Protection (MassDEP) for review and potential approval; and
WHEREAS: As currently proposed, the Draft Updated CSO Long-Term Control Plan puts forth recommendations that offer incomplete CSO control and fail to eliminate CSO outfalls and sewer overflows into our waterways, resulting in the continuation of a public health crisis; NOW, THEREFORE, BE IT
RESOLVED: That the Somerville City Council opposes the current Draft Updated Combined Sewer Overflow Long-term Control Plan; AND BE IT FURTHER
RESOLVED: That the Somerville City Council calls on the MWRA to use its bonding capacity and regional ratepayer base to finance a 25-year level of control in the Charles River, Alewife Brook, and Upper Mystic River basins; AND BE IT FURTHER
RESOLVED: That the City of Somerville work to coordinate with neighboring municipalities and state agencies to ensure all sewer system infrastructure planning prioritizes the elimination of CSOs and the total protection of the Alewife Brook and Mystic River; AND BE IT FURTHER
RESOLVED: That the Somerville City Council calls on the MWRA to work with the regional municipalities along the affected waterways to ensure that the Final CSO Long-Term Control Plan (LTCP) for the Charles River, Alewife Brook, and Upper Mystic River puts forth recommendations that will achieve the highest level of CSO control through modern infrastructure solutions, including sewer separation and green stormwater infrastructure, and regional cooperation resulting in no discharges except during a 2050 25-year storm or larger; AND BE IT FURTHER
RESOLVED: That a copy of this Resolution be transmitted to the Massachusetts Water Resources Authority Board of Directors and Advisory Board, the Massachusetts Department of Environmental Protection, the Environmental Protection Agency, the Massachusetts Environmental Policy Act Office, the City of Cambridge, the Town of Arlington, the Boston City Council, Somerville's state legislative delegation, and Governor Healey.