How many wastewater permits expire in Massachusetts in 2027?

17 NPDES permits held by publicly owned wastewater treatment plants in Massachusetts expire in 2027, covering a combined average flow of 20 MGD. The busiest month is Oct 2027 with 15 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 2027?

Westborough Wastewater Treatment Plant in Westborough, treating about 4.17 MGD under permit MA0100412, expiring Apr 2027.

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

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

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Massachusetts wastewater permits expiring in 2027

Name: Massachusetts NPDES permits expiring in 2027
Creator: Klarifi
License: https://klarifi.io/terms-of-service

17 NPDES permits · 20 MGD combined average flow

17 publicly owned wastewater treatment plants in Massachusetts hold NPDES permits that expire during 2027, 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)2028 (5)All Massachusetts NPDES permits →

Publicly owned wastewater treatment plants in Massachusetts with NPDES permits expiring in 2027, from EPA ICIS-NPDES records. Refreshed on every release.
Facility	City	Avg flow (MGD)	NPDES permit	Expires	Technology	Violations (3y)
Marlborough DPW Water Division East Plt	Marlborough	2.04	MA0100498	Mar 2027	Clarifiers	13
Westborough Wastewater Treatment Plant	Westborough	4.17	MA0100412	Apr 2027	Clarifiers, Carrousels / oxidation ditches, Biogas balloons	2
Gardner W W T F	East Templeton	2.28	MAG590013	Oct 2027	Clarifiers, Biogas silos	75
Rockland Wastewater Plant	Rockland	2	MAG590038	Oct 2027	Clarifiers, Biogas silos	32
Newburyport Wastewater Treatment Facility	Newburyport	1.45	MAG590035	Oct 2027	Clarifiers, Biogas silos, Biogas balloons	0
Greenfield Water Pollution Control Facility	Greenfield	1.44	MAG590014	Oct 2027	Clarifiers	31
Plymouth Wastewater Treatment Facility	Plymouth	1.31	MAG590040	Oct 2027	Uncovered lagoons, Biogas balloons	5
Middleborough WPCF	Middleborough	1.09	MAG590042	Oct 2027	Clarifiers	11
Hudson W W T F	Hudson	0.78	MAG590029	Oct 2027	Clarifiers	78
Uxbridge Wastewater Treatment Facility	Uxbridge	0.71	MAG590003	Oct 2027	Clarifiers	24
Concord Wastewater Treatment Facility	Concord	0.68	MAG590030	Oct 2027	Clarifiers, Uncovered lagoons	5
Orange Wastewater Treatment Plant	Orange	0.61	MAG590019	Oct 2027	Clarifiers	508
Ipswich Wastewater Treatment Plant	Ipswich	0.5	MAG590036	Oct 2027	Clarifiers	2
Lee Wastewater Treatment Facility	Lee	0.47	MAG590023	Oct 2027	—	0
Spencer Wastewater Treatment Plant	Spencer	0.44	MAG590010	Oct 2027	Clarifiers, Biogas balloons	20
Lenox Center Wastewater Treatment Facility	Lenox	0.3	MAG590024	Oct 2027	Clarifiers	12
Erving Wastewater Treatment Plant #1	Erving	0.06	MAG590020	Oct 2027	Clarifiers	0

Massachusetts permit renewals in 2027: 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 September 11, 2026.

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