How many wastewater permits expire in Massachusetts in 2028?

5 NPDES permits held by publicly owned wastewater treatment plants in Massachusetts expire in 2028, covering a combined average flow of 12 MGD. The busiest month is Nov 2028 with 3 expiries.

What happens when an NPDES permit expires?

The plant must have applied for renewal at least 180 days before the expiry date. If the agency has not reissued the permit by then, the old permit is administratively continued and stays enforceable. The reissued permit typically carries updated effluent limits based on the latest water-quality standards, which is what drives upgrade projects.

Which is the largest plant with a permit expiring in Massachusetts in 2028?

Northampton Wastewater Treatment Plant in Northampton, treating about 4.21 MGD under permit MA0101818, expiring Nov 2028.

How do I get contacts for the plants on this list?

Every plant links to its profile with flow, permit and compliance data. Treatment technology and verified decision-maker contacts for each plant, and the same list for every state and year, are available in Klarifi with a free account.

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Massachusetts wastewater permits expiring in 2028

Name: Massachusetts NPDES permits expiring in 2028
Creator: Klarifi
License: https://klarifi.io/terms-of-service

5 NPDES permits · 12 MGD combined average flow

5 publicly owned wastewater treatment plants in Massachusetts hold NPDES permits that expire during 2028, issued by US EPA Region 1 (with MassDEP). The table lists each plant with its permit number, expiry month, average flow, treatment technology and three-year violation count, in order of expiry.

An NPDES permit runs for five years. To keep discharging, a plant must apply for renewal at least 180 days before the expiry date, and the renewed permit usually arrives with tighter effluent limits, new monitoring requirements or a compliance schedule. That is why the year a permit expires is the year a plant starts budgeting for upgrades: nutrient removal, disinfection, capacity or controls.

Other years:

2026 (31)2027 (18)All Massachusetts NPDES permits →

Publicly owned wastewater treatment plants in Massachusetts with NPDES permits expiring in 2028, from EPA ICIS-NPDES records. Refreshed on every release.
Facility	City	Avg flow (MGD)	NPDES permit	Expires	Violations (3y)
Northampton Wastewater Treatment Plant	Northampton	4.21	MA0101818	Nov 2028	41
Westfield Wastewater Treatment Plant	Westfield	2.95	MA0101800	Nov 2028	0
Palmer Water Pollution Control Facility	Palmer (three Rivers)	1.37	MA0101168	Nov 2028	5
Hoosic Wastwater Treament Plant	Williamstown	3.26	MA0100510	Dec 2028	2
Montague Wastewater Treatment Facility	Montague	0.53	MA0100137	Dec 2028	267

Massachusetts permit renewals in 2028: questions

Sources and methodology

Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.

Data refreshed October 26, 2026.

Wastewater terms: NPDES permit · POTW · Biological nutrient removal · Tertiary treatment · Oxidation ditch · Anaerobic digester · all terms

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Journalists, researchers and educators are welcome to quote these figures. Please credit Klarifi as the source and link to this page.

Klarifi. “NPDES permits expiring in 2028: Massachusetts plants.” Updated October 26, 2026. https://klarifi.io/facilities/massachusetts/permits-expiring/2028

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