How many wastewater permits expire in Maine in 2028?

9 NPDES permits held by publicly owned wastewater treatment plants in Maine expire in 2028, covering a combined average flow of 1 MGD. The busiest month is Mar 2028 with 2 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 Maine in 2028?

Dover-Foxcroft Wastewater Treatment Facility in Dover-Foxcroft, treating about 0.31 MGD under permit ME0100501, expiring Feb 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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Maine wastewater permits expiring in 2028

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

9 NPDES permits · 1 MGD combined average flow

9 publicly owned wastewater treatment plants in Maine hold NPDES permits that expire during 2028, issued by Maine Department of Environmental Protection. 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:

2027 (7)All Maine NPDES permits →

Publicly owned wastewater treatment plants in Maine 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)
Dover-Foxcroft Wastewater Treatment Facility	Dover-Foxcroft	0.31	ME0100501	Feb 2028	6
Newport Wastewater Treatement Facility	Newport	0.22	ME0100447	Mar 2028	2
Milo Wastewater Treatment Facility	Milo	0.2	ME0100439	Mar 2028	15
Mattawamkeag WWTF	Mattawamkeag	0.02	ME0102245	Apr 2028	2
Eagle Lake Water & Sewer Dist	Wallagrass	0.0015	MEU507955	Aug 2028	0
Dexter Utility District	Dexter	—	MEU500830	Aug 2028	3
Rangeley Wastewater Treatment Facility	Rangeley	—	MEU508086	Sep 2028	0
Great Salt Bay Sanitary Dist	Nobleboro	0.0061	ME0102431	Dec 2028	0
Patten Wastwater Treatment Facility	Patten	0.003	MEU507775	Dec 2028	0

Maine 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 · Inflow and infiltration · Sludge dewatering · all terms

Cite this page

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: Maine wastewater plants.” Updated October 26, 2026. https://klarifi.io/facilities/maine/permits-expiring/2028

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