Clean Water Act discharge permit · NPDES CT0100145
DANBURY WPCF, Danbury, CT: NPDES CT0100145 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 30Pollutants under a numeric limit
- 17Pollutants with an effluent exceedance
DANBURY WPCF holds NPDES permit CT0100145, which discharges to Still Rvr(E. Swamp/Limekiln Brooks). EPA’s file records it issued October 30, 2014 and expiring October 31, 2019. 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 | DANBURY WPCF |
|---|---|
| Permittee as filed | DANBURY WPCF |
| NPDES ID | CT0100145 |
| 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 | October 30, 2014 |
| Expiration date | October 31, 2019 |
| Issuing agency | CT DEP |
| Address | Danbury, CT 06810 |
| Receiving water | STILL RVR(E. SWAMP/LIMEKILN BROOKS) |
| Subwatershed | Limekiln Brook-Still River (HUC 011000050802) |
| Program components on file | Biosolids, POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | ICIS-AIR source CT0000000900109163 |
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
- 36Pollutants on file
- 30Under a numeric limit
- 21With a violation of any kind
- 17With 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 |
|---|---|---|---|---|---|
| Chlorine, total residual | 1 | 63 | 38 | July 31, 2009 | 3,500% over the limit |
| Oxygen, dissolved [DO] | 1 | 31 | 31 | October 31, 2002 | 53% over the limit |
| Phosphorus, total [as P] | 5 | 42 | 23 | May 31, 2007 | 5,233% over the limit |
| Coliform, fecal general | 2 | 14 | 14 | July 31, 2015 | 99,999% over the limit |
| Copper, total [as Cu] | 2 | 13 | 13 | October 31, 2025 | 154% over the limit |
| Phosphorus, total percent removal | 0 | 12 | 12 | April 30, 2001 | 57% over the limit |
| pH | 2 | 11 | 11 | May 31, 2007 | |
| Solids, settleable | 0 | 10 | 10 | October 31, 1991 | 300% over the limit |
| Zinc, total [as Zn] | 2 | 7 | 7 | December 31, 2022 | 409% over the limit |
| Lead, total [as Pb] | 2 | 5 | 5 | February 29, 2016 | 159% over the limit |
| BOD, 5-day, 20 deg. C | 5 | 4 | 4 | September 30, 1991 | 48% over the limit |
| E. coli | 2 | 4 | 3 | June 30, 2019 | 1,237% over the limit |
| Nitrogen, ammonia total [as N] | 8 | 3 | 3 | June 30, 1989 | 787% over the limit |
| Solids, total suspended | 3 | 3 | 3 | November 30, 1992 | 148% over the limit |
| Solids, suspended percent removal | 1 | 2 | 2 | June 30, 1989 | 127% over the limit |
| Flow, in conduit or thru treatment plant | 0 | 1 | 1 | March 31, 2001 | 3% over the limit |
| Phosphorus, Total [Avg Seasonal Load Cap] | 0 | 1 | 1 | October 31, 2021 | 442% over the limit |
| Oxygen demand, ultimate | 0 | 9 | 0 | ||
| NOAEL Static 48Hr Acute D. pulex | 2 | 1 | 0 | ||
| NOAEL Static 48Hr Acute Pimephales promelas | 2 | 1 | 0 | ||
| Selenium, total [as Se] | 0 | 1 | 0 | ||
| Flow rate | 2 | 0 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 0 | 0 | ||
| Arsenic, sludge tot. dry wt [as As] | 1 | 0 | 0 | ||
| Beryllium, sludge, tot. dry wt [as Be] | 1 | 0 | 0 | ||
| Solids, total, percent | 1 | 0 | 0 | ||
| Solids, fixed, % of total solids | 1 | 0 | 0 | ||
| Solids, volatile % of total solids | 1 | 0 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 1 | 0 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 1 | 0 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 1 | 0 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 1 | 0 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 1 | 0 | 0 | ||
| Copper, sludge, total, dry weight [as Cu] | 1 | 0 | 0 | ||
| Cadmium, sludge, total, dry weight [as Cd] | 1 | 0 | 0 | ||
| BOD, 5-day, percent removal | 1 | 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
- 1Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 30, 2020 | Monitoring Violations - Failure to Monitor for Toxicity Requirements | 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.
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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 CT0100145 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.