Clean Water Act discharge permit · NPDES CT0100412
NORWICH WPCF, Norwich, CT: NPDES CT0100412 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MajorDischarger class
- 50Pollutants under a numeric limit
- 12Pollutants with an effluent exceedance
NORWICH WPCF holds NPDES permit CT0100412, which discharges to Thames River. EPA’s file records it issued November 2, 2020 and expiring November 30, 2025. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | NORWICH WPCF |
|---|---|
| Permittee as filed | NORWICH WPCF |
| NPDES ID | CT0100412 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | November 2, 2020 |
| Expiration date | November 30, 2025 |
| Issuing agency | CT DEP |
| Address | Norwich, CT 06360 |
| Receiving water | THAMES RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Beaver Brook-Shetucket River (HUC 011000020303) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 51Pollutants on file
- 50Under a numeric limit
- 33With a violation of any kind
- 12With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| BOD, 5-day, percent removal | 2 | 30 | 29 | March 31, 2024 | 220% over the limit |
| pH | 4 | 19 | 17 | November 30, 2025 | |
| Chlorine, total residual | 6 | 19 | 15 | July 31, 2026 | 200% over the limit |
| Solids, suspended percent removal | 2 | 14 | 13 | September 30, 2021 | 133% over the limit |
| Enterococci | 4 | 12 | 12 | July 31, 2026 | 99,999% over the limit |
| BOD, 5-day, 20 deg. C | 10 | 14 | 11 | January 31, 2019 | 136% over the limit |
| Coliform, fecal general | 2 | 13 | 11 | July 31, 2021 | 300% over the limit |
| Coliform, fecal - % samples exceeding limit | 2 | 6 | 6 | August 31, 2023 | 510% over the limit |
| Solids, total suspended | 10 | 8 | 5 | February 28, 2013 | 52% over the limit |
| NOAEL Static 48Hr Acute D. pulex | 4 | 2 | 2 | April 30, 2009 | 100% over the limit |
| NOAEL Static 48Hr Acute Pimephales promelas | 4 | 1 | 1 | April 30, 2009 | 100% over the limit |
| Flow, in conduit or thru treatment plant | 0 | 1 | 1 | April 30, 2004 | 12% over the limit |
| Iron, total [as Fe] | 4 | 3 | 0 | ||
| Flow rate | 4 | 2 | 0 | ||
| Phenols | 4 | 2 | 0 | ||
| BOD, carbonaceous [5 day, 5 C] | 4 | 2 | 0 | ||
| Phosphorus, total [as P] | 6 | 1 | 0 | ||
| Thallium, total [as Tl] | 4 | 1 | 0 | ||
| Antimony, total [as Sb] | 4 | 1 | 0 | ||
| Aluminum, total [as Al] | 4 | 1 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 2 | 1 | 0 | ||
| Arsenic, sludge tot. dry wt [as As] | 2 | 1 | 0 | ||
| Beryllium, sludge, tot. dry wt [as Be] | 2 | 1 | 0 | ||
| Solids, total, percent | 2 | 1 | 0 | ||
| Solids, fixed, % of total solids | 2 | 1 | 0 | ||
| Solids, volatile % of total solids | 2 | 1 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 2 | 1 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 2 | 1 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 2 | 1 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 2 | 1 | 0 | ||
| Copper, sludge, total, dry weight [as Cu] | 2 | 1 | 0 | ||
| Cadmium, sludge, total, dry weight [as Cd] | 2 | 1 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 1 | 1 | 0 | ||
| Nitrogen, ammonia total [as N] | 4 | 0 | 0 | ||
| Nitrogen, nitrite total [as N] | 4 | 0 | 0 | ||
| Nitrogen, nitrate total [as N] | 4 | 0 | 0 | ||
| Cyanide, total [as CN] | 4 | 0 | 0 | ||
| Cyanide, free [amenable to chlorination] | 4 | 0 | 0 | ||
| Arsenic, total [as As] | 4 | 0 | 0 | ||
| Beryllium, total [as Be] | 4 | 0 | 0 | ||
| Cadmium, total [as Cd] | 4 | 0 | 0 | ||
| Chromium, hexavalent [as Cr] | 4 | 0 | 0 | ||
| Chromium, total [as Cr] | 4 | 0 | 0 | ||
| Copper, total [as Cu] | 4 | 0 | 0 | ||
| Lead, total [as Pb] | 4 | 0 | 0 | ||
| Nickel, total [as Ni] | 4 | 0 | 0 | ||
| Silver, total [as Ag] | 4 | 0 | 0 | ||
| Zinc, total [as Zn] | 4 | 0 | 0 | ||
| Selenium, total [as Se] | 4 | 0 | 0 | ||
| Mercury, total [as Hg] | 4 | 0 | 0 | ||
| Chlorine, free available | 2 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 16, 2021 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| January 1, 2018 | WW CSO - Dry weather overflow | EP6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.