Clean Water Act discharge permit · NPDES CT0101273
NEW CANAAN STP, New Canaan, CT: NPDES CT0101273 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 44Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
NEW CANAAN STP holds NPDES permit CT0101273, which discharges to Five Mile River. EPA’s file records it issued September 29, 2015 and expiring September 30, 2020. 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 | NEW CANAAN STP |
|---|---|
| Permittee as filed | NEW CANAAN STP |
| NPDES ID | CT0101273 |
| 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 | September 29, 2015 |
| Expiration date | September 30, 2020 |
| Issuing agency | CT DEP |
| Address | New Canaan, CT 06840 |
| Receiving water | FIVE MILE RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Fivemile River (HUC 011000060404) |
| Program components on file | POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 50Pollutants on file
- 44Under a numeric limit
- 18With a violation of any kind
- 4With 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 |
|---|---|---|---|---|---|
| Zinc, total [as Zn] | 5 | 111 | 94 | March 31, 2024 | 70% over the limit |
| Copper, total [as Cu] | 4 | 24 | 20 | January 31, 2015 | 700% over the limit |
| Flow, in conduit or thru treatment plant | 0 | 6 | 4 | March 31, 2011 | 29% over the limit |
| Nitrogen, ammonia total [as N] | 8 | 12 | 2 | August 31, 2006 | 50% over the limit |
| BOD, 5-day, 20 deg. C | 7 | 8 | 0 | ||
| Solids, total suspended | 7 | 8 | 0 | ||
| pH | 2 | 8 | 0 | ||
| Nitrogen, total [as N] | 0 | 8 | 0 | ||
| Nitrogen, nitrite total [as N] | 2 | 6 | 0 | ||
| Nitrogen, nitrate total [as N] | 2 | 6 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 0 | 6 | 0 | ||
| Temperature, water deg. fahrenheit | 0 | 4 | 0 | ||
| Coliform, fecal general | 0 | 4 | 0 | ||
| Phosphorus, total [as P] | 4 | 2 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 2 | 0 | ||
| BOD, 5-day, percent removal | 1 | 2 | 0 | ||
| Solids, suspended percent removal | 1 | 2 | 0 | ||
| Phosphorous, in total orthophosphate | 0 | 2 | 0 | ||
| Arsenic, total [as As] | 3 | 0 | 0 | ||
| Beryllium, total [as Be] | 3 | 0 | 0 | ||
| Flow rate | 2 | 0 | 0 | ||
| Cyanide, total [as CN] | 2 | 0 | 0 | ||
| Cyanide, free [amenable to chlorination] | 2 | 0 | 0 | ||
| Cadmium, total [as Cd] | 2 | 0 | 0 | ||
| Chromium, hexavalent [as Cr] | 2 | 0 | 0 | ||
| Chromium, total [as Cr] | 2 | 0 | 0 | ||
| Iron, total [as Fe] | 2 | 0 | 0 | ||
| Lead, total [as Pb] | 2 | 0 | 0 | ||
| Thallium, total [as Tl] | 2 | 0 | 0 | ||
| Nickel, total [as Ni] | 2 | 0 | 0 | ||
| Silver, total [as Ag] | 2 | 0 | 0 | ||
| Antimony, total [as Sb] | 2 | 0 | 0 | ||
| Aluminum, total [as Al] | 2 | 0 | 0 | ||
| Selenium, total [as Se] | 2 | 0 | 0 | ||
| Phenols | 2 | 0 | 0 | ||
| Chlorine, total residual | 2 | 0 | 0 | ||
| E. coli | 2 | 0 | 0 | ||
| Mercury, total [as Hg] | 2 | 0 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 0 | 0 | ||
| Phosphorus, Total [Avg Seasonal Load Cap] | 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 |
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 |
|---|---|---|
| March 25, 2022 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| December 18, 2019 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| December 18, 2019 | Monitoring Violations - Improper Analysis or Lab Error | 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 CT0101273 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.