Clean Water Act discharge permit · NPDES CT0100161
DERBY, CITY OF WPCF, Derby, CT: NPDES CT0100161 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 26Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
DERBY, CITY OF WPCF, held by DERBY WPCF, CITY OF, holds NPDES permit CT0100161, which discharges to Housatonic River. EPA’s file records it issued January 8, 2013 and expiring January 31, 2018. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | DERBY, CITY OF WPCF |
|---|---|
| Permittee as filed | DERBY WPCF, CITY OF |
| NPDES ID | CT0100161 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | January 8, 2013 |
| Expiration date | January 31, 2018 |
| Issuing agency | CT DEP |
| Address | Derby, CT 06418 |
| Receiving water | HOUSATONIC RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Halfway River-Housatonic River (HUC 011000051003) |
| Program components on file | Biosolids, POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | ICIS-AIR source CT0000000900907744 |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 43Pollutants on file
- 26Under a numeric limit
- 43With a violation of any kind
- 8With 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 |
|---|---|---|---|---|---|
| Enterococci | 2 | 11 | 5 | August 31, 2025 | 483% over the limit |
| Solids, total suspended | 3 | 12 | 3 | April 30, 2026 | 116% over the limit |
| Solids, suspended percent removal | 1 | 12 | 2 | March 31, 2024 | 53% over the limit |
| pH | 2 | 8 | 2 | January 31, 2023 | |
| Chlorine, total residual | 2 | 5 | 2 | May 31, 2026 | 267% over the limit |
| Coliform, fecal general | 3 | 4 | 2 | May 31, 2001 | 49,899% over the limit |
| BOD, 5-day, percent removal | 1 | 8 | 1 | January 31, 2019 | 7% over the limit |
| Flow, in conduit or thru treatment plant | 0 | 1 | 1 | March 31, 2010 | 1% over the limit |
| Flow | 2 | 10 | 0 | ||
| BOD, 5-day, 20 deg. C | 3 | 9 | 0 | ||
| Solids, volatile % of total solids | 1 | 6 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 5 | 0 | ||
| Arsenic, sludge tot. dry wt [as As] | 1 | 5 | 0 | ||
| Beryllium, sludge, tot. dry wt [as Be] | 1 | 5 | 0 | ||
| Solids, total, percent | 1 | 5 | 0 | ||
| Solids, fixed, % of total solids | 1 | 5 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 1 | 5 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 1 | 5 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 1 | 5 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 1 | 5 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 1 | 5 | 0 | ||
| Copper, sludge, total, dry weight [as Cu] | 1 | 5 | 0 | ||
| Cadmium, sludge, total, dry weight [as Cd] | 1 | 5 | 0 | ||
| NOAEL Static 48Hr Acute D. pulex | 2 | 3 | 0 | ||
| NOAEL Static 48Hr Acute Pimephales promelas | 2 | 3 | 0 | ||
| Phosphorus, total [as P] | 1 | 3 | 0 | ||
| Coliform, fecal - % samples exceeding limit | 1 | 2 | 0 | ||
| Arsenic, total [as As] | 0 | 1 | 0 | ||
| Beryllium, total [as Be] | 0 | 1 | 0 | ||
| Cadmium, total [as Cd] | 0 | 1 | 0 | ||
| Chromium, total [as Cr] | 0 | 1 | 0 | ||
| Copper, total [as Cu] | 0 | 1 | 0 | ||
| Iron, total [as Fe] | 0 | 1 | 0 | ||
| Lead, total [as Pb] | 0 | 1 | 0 | ||
| Thallium, total [as Tl] | 0 | 1 | 0 | ||
| Nickel, total [as Ni] | 0 | 1 | 0 | ||
| Silver, total [as Ag] | 0 | 1 | 0 | ||
| Zinc, total [as Zn] | 0 | 1 | 0 | ||
| Antimony, total [as Sb] | 0 | 1 | 0 | ||
| Aluminum, total [as Al] | 0 | 1 | 0 | ||
| Selenium, total [as Se] | 0 | 1 | 0 | ||
| Phenols | 0 | 1 | 0 | ||
| Mercury, total [as Hg] | 0 | 1 | 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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| February 26, 2021 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| December 5, 2018 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| December 5, 2018 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
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.
Watch this permit
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID CT0100161 there.
Nearby on the register
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- Every permit record in Connecticut, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.