How MWRA’s operating policies allow regional growth while protecting the service and supply its ratepayers purchased — takeaways from the MWRA’s 2025 Annual Update on New Connections
MWRA’s 2025 Annual Update on New Connections reads on its surface as a routine compliance check on the communities and businesses that have joined the water and sewer systems since 2002. Read more closely, it is a report card on a framework of operating policies — OP.04, OP.05, OP.09, OP.10, and OP.11 — that lets MWRA extend its capacity to others without weakening the service or the supply its member communities depend on. And it tells two very different stories.
On the water side, the story is opportunity. Decades of conservation have left MWRA with room to spare: reservoir withdrawals remain more than 130 MGD below their 1980s peak, and the system holds roughly 5.6 years of supply. Even as 2025 demand rose about six percent, to 213.4 MGD — driven by drought and by PFAS contamination pushing communities such as Peabody, Burlington, and Woburn toward MWRA — the Authority has surplus to share, and a growing line of communities need it to grow.
On the sewer side, the story is scarcity. Transport capacity in the wastewater system is genuinely limited, especially during wet weather, when inflow, infiltration and stormwater already strain the pipes and treatment plants. There is little slack to absorb new flow, so every request is weighed against the risk of overflows and permit violations. The result is two systems governed with almost opposite postures on growth — water positioned to accommodate it, sewer compelled to constrain it — and a set of operating policies calibrated to each.
Running through both stories is a single checkpoint. No community, business, or emergency draw joins the system on staff say-so alone: the MWRA Advisory Board reviews and votes on every request — new admissions, expanded withdrawals, emergency connections, and sewer discharges alike — before it can advance to the MWRA Board of Directors for final action. The operating policies provide the framework for review, but they do not dictate the outcome; the Advisory Board weighs each request on its merits and determines whether to approve it.
Water: fees and limits that shield existing communities
On the water side, OP.10 protects current members two ways. Firm withdrawal limits, written into every water-supply agreement, cap how much a new community can draw so that added customers do not erode reservoir yield. And an entrance fee recovers each newcomer’s fair share of the system’s existing value, so today’s ratepayers are not subsidizing assets they have already paid for.
The 2022 revision that lets MWRA waive that fee is deliberately bounded: it applies only to communities with documented water-quality, stressed-basin, or economic-development need, is capped at 20 mgd in total, and sunsets on December 31, 2027. The waiver does not make expansion cost-free: existing communities forgo revenue they would otherwise receive. But selling more water spreads MWRA’s largely fixed costs across a broader base and can reduce their annual assessment shares.
That waiver also illustrates how the Advisory Board approaches its ratepayer-protection role. The Board had long defended the entrance fee as a way to make existing communities whole for the investments they had already funded through their assessments. It changed that position only after a months-long review produced a different answer: the long-term reduction in existing communities’ assessment shares from additional water sales could substantially exceed the entrance-fee revenue they would forgo.
Waiving the fee still carried a real cost, but the analysis demonstrated greater value in return. The change was therefore not a retreat from ratepayer protection, but an application of it — adapting the policy when the evidence showed that the value was worth the burden.
Those rules shaped 2025’s activity. The Lynnfield Center Water District was admitted in August — following votes of the Advisory Board and MWRA Board of Directors — with its roughly $1.7 million entrance fee waived on stressed-basin and PFAS grounds, the first new community since 2020. Wilmington, Burlington, and the Dedham-Westwood Water District, all partial-supply members, won increases to their withdrawal limits that the Board likewise approved, and every pre-2020 entrance fee is being paid on schedule.
Emergencies: a valve that stays closed until it must open
OP.05 governs the emergency connection. It lets a non-member town draw MWRA water when its own supply fails, but only under a MassDEP emergency declaration, for no more than six months at a time, and with Advisory Board approval — so a genuine emergency never hardens into a permanent, unbudgeted draw on the reservoir. Wayland relied on it twice in 2025, after a piping failure at its Happy Hollow treatment plant in August and air-dryer failures at Baldwin Pond in November and is now pursuing full admission.
Sewer: strict rules for a genuinely scarce resource
The sewer policies, OP.11 and OP.04, translate that scarcity into hard tests. Before admitting anyone, MWRA must find that the system’s safe capacity will still meet ordinary wet-weather demand, tested against a design storm in which peak sanitary flow, infiltration, and inflow all arrive at once, and that new flow will not cause overflows or breach its federal discharge permit.
Every applicant must also remove four gallons of stormwater inflow for each new gallon of wastewater — by funding work performed by their community or MWRA. Some newcomers fund improvements in neighboring towns, among them the Rivers School in Weston paid $141,600 to Natick and Crescent Ridge Dairy in Sharon paid $200,000 to Stoughton.
Sewer entrance fees and user charges cannot be waived at all, and pricing is set so new users generally pay more than current ones. Straddle properties — partly within and partly outside the service area — can connect under OP.04 with Advisory Board and Board of Directors approval alone; communities or properties located entirely outside the service area still require a special act of the Legislature.
Those guardrails explain the sewer side’s small, stable footprint: just eleven entities in more than two decades, nearly all discharging below their limits in 2025. The lone exception, The Rivers School in Weston at 3,879 gpd against a 3,000-gpd limit, is under staff review. They also explain the report’s caution about “limited capacity” whenever a large prospect appears — as it does with the former South Weymouth Naval Air Station’s projected 0.93 MGD of wastewater.
The payoff: a disciplined way to say yes
That discipline matters because interest is surging. Four feasibility studies, the newest covering the Quabbin Reservoir watershed, have drawn a number of potential applicants— Natick, Weymouth, Walpole, Dover, Hopkinton, Billerica, Westborough, Wellesley, and the new North Sherborn district among them.
The stakes reach beyond water security. Many of these connections exist to unlock housing and economic development that local supply and sewer constraints would otherwise stall — from the roughly 190 homes planned for the new North Sherborn Water and Sewer District to the master-planned residential community rising at the former South Weymouth Naval Air Station. OP.10 even names constrained local economic development as grounds for waiving the water entrance fee. Reliable water and sewer capacity, in other words, is a precondition for meeting state and local housing goals.
The value of the operating policies is precisely that they give MWRA a disciplined way to say yes: to convert surplus into regional water security — and the housing and growth that depend on it — while ensuring that communities already in the system share in the benefits, without shifting costs to them or compromising capacity and reliability.
For more information visit MWRA Admission Policies. Full report link.
