How many wastewater permits expire in Connecticut in 2026?

7 NPDES permits held by publicly owned wastewater treatment plants in Connecticut expire in 2026, covering a combined average flow of 38 MGD. The busiest month is Mar 2026 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 Connecticut in 2026?

Norwalk WPCF in East Norwalk, treating about 11.32 MGD under permit CT0101249, expiring Mar 2026.

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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Connecticut wastewater permits expiring in 2026

Name: Connecticut NPDES permits expiring in 2026
Creator: Klarifi
License: https://klarifi.io/terms-of-service

7 NPDES permits · 38 MGD combined average flow

7 publicly owned wastewater treatment plants in Connecticut hold NPDES permits that expire during 2026, issued by Connecticut Department of Energy and 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.

All Connecticut NPDES permits →

Publicly owned wastewater treatment plants in Connecticut with NPDES permits expiring in 2026, from EPA ICIS-NPDES records. Refreshed on every release.
Facility	City	Avg flow (MGD)	NPDES permit	Expires	Violations (3y)
New Canaan Wastewater Treatment Plant	New Canaan	0.87	CT0101273	Jan 2026	2
Norwalk WPCF	East Norwalk	11.32	CT0101249	Mar 2026	13
Seymour WPCF	Seymour	1.12	CT0100501	Mar 2026	6
Eastside Water Pollution Control Facility	Bridgeport	5.24	CT0101010	Apr 2026	36
Glastonbury Water Pollution Control Facility	Glastonbury	2.5	CT0100226	Apr 2026	8
Danbury Water Pollution Control Facility	Danbury	9.24	CT0100145	Jun 2026	5
Fairfield Water Pollution Control Facility	Fairfield	7.87	CT0101044	Sep 2026	4

Connecticut permit renewals in 2026: 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 2026: Connecticut plants.” Updated October 26, 2026. https://klarifi.io/facilities/connecticut/permits-expiring/2026

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