Connecticut wastewater permits expiring in 2026
7 NPDES permits · 31 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.
| Facility | City | Avg flow (MGD) | NPDES permit | Expires | Technology | Violations (3y) |
|---|---|---|---|---|---|---|
| New Canaan Wastewater Treatment Plant | New Canaan | 0.55 | CT0101273 | Jan 2026 | Clarifiers, Carrousels / oxidation ditches | 4 |
| Norwalk WPCF | East Norwalk | 9.4 | CT0101249 | Mar 2026 | Clarifiers | 9 |
| Seymour WPCF | Seymour | 0.89 | CT0100501 | Mar 2026 | Clarifiers | 6 |
| Eastside Water Pollution Control Facility | Bridgeport | 4.1 | CT0101010 | Apr 2026 | Biogas silos | 37 |
| Glastonbury Water Pollution Control Facility | Glastonbury | 2.17 | CT0100226 | Apr 2026 | Clarifiers, Carrousels / oxidation ditches | 9 |
| Danbury Water Pollution Control Facility | Danbury | 7.8 | CT0100145 | Jun 2026 | Clarifiers, Biogas silos, Biogas balloons | 5 |
| Fairfield Water Pollution Control Facility | Fairfield | 5.9 | CT0101044 | Sep 2026 | Clarifiers | 5 |
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 September 11, 2026.