BOSTON — Legislation allowing for creation of a wastewater partnership among the towns of Dennis, Harwich and Yarmouth has passed the Legislature and is awaiting signature by Gov. Charlie Baker.

In a joint statement issued Thursday, Sen. Julian Cyr, D-Truro, and state Reps. Sarah Peake, D-Provincetown; Timothy Whelan, R-Brewster; and William Crocker, R-Centerville, announced the passage of the bill that will make the DHY Clean Waters Community Partnership a legal entity, and they commended the towns for coming together to solve the infrastructure challenge of treating wastewater.

“The (towns) have worked hard to come up with an important inter-municipal partnership that will reduce excess nitrogen that is polluting the Cape’s marine environment and provide cleaner water for their residents and visitors for decades to come,” the statement says.

The legislation grants the partnership the authority to incur debt and acquire land for wastewater, but an agreement among the towns will determine how the partnership works, including how each town is represented and how much it will pay. Representatives from the towns aim to finalize that agreement by December and put it to a vote by town meetings in the spring.

Plans call for treating wastewater from each town at a central facility in South Dennis. Although the towns would be individually responsible for installing their own collection systems, sharing a treatment plant would save them a combined $70 million in upfront construction costs, along with an estimated $6 million in annual operating costs, according to a website for the project.

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