Clean Water Act discharge permit · NPDES CT0101281
STONINGTON BOROUGH WPCF, Stonington, CT: NPDES CT0101281 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 26Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
STONINGTON BOROUGH WPCF, held by STONINGTON-BOROUGH WPCF, holds NPDES permit CT0101281, which discharges to Stonington Harbor. EPA’s file records it issued October 23, 2013 and expiring October 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 | STONINGTON BOROUGH WPCF |
|---|---|
| Permittee as filed | STONINGTON-BOROUGH WPCF |
| NPDES ID | CT0101281 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | October 23, 2013 |
| Expiration date | October 31, 2018 |
| Issuing agency | CT DEP |
| Address | Stonington, CT 06378 |
| Receiving water | STONINGTON HARBOR |
| Subwatershed | Stony Brook-Frontal Fishers Island Sound (HUC 011000030303) |
| Program components on file | Biosolids, 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
- 27Pollutants on file
- 26Under a numeric limit
- 21With a violation of any kind
- 7With 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 |
|---|---|---|---|---|---|
| Coliform, fecal general | 4 | 33 | 33 | May 31, 2024 | 99,999% over the limit |
| Enterococci | 2 | 27 | 27 | May 31, 2026 | 99,999% over the limit |
| Solids, total suspended | 3 | 5 | 5 | December 31, 2014 | 44% over the limit |
| Solids, suspended percent removal | 1 | 5 | 5 | November 30, 2012 | 220% over the limit |
| Carbonaceous oxygen demand, % removal | 1 | 3 | 3 | April 30, 2010 | 127% over the limit |
| Chlorine, total residual | 2 | 2 | 2 | October 31, 2005 | 100% over the limit |
| BOD, carbonaceous [5 day, 5 C] | 3 | 1 | 1 | April 30, 2012 | 49% over the limit |
| Flow, in conduit or thru treatment plant | 0 | 2 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 1 | 0 | ||
| Arsenic, sludge tot. dry wt [as As] | 1 | 1 | 0 | ||
| Beryllium, sludge, tot. dry wt [as Be] | 1 | 1 | 0 | ||
| Solids, total, percent | 1 | 1 | 0 | ||
| Solids, fixed, % of total solids | 1 | 1 | 0 | ||
| Solids, volatile % of total solids | 1 | 1 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 1 | 1 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 1 | 1 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 1 | 1 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 1 | 1 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 1 | 1 | 0 | ||
| Copper, sludge, total, dry weight [as Cu] | 1 | 1 | 0 | ||
| Cadmium, sludge, total, dry weight [as Cd] | 1 | 1 | 0 | ||
| Flow rate | 2 | 0 | 0 | ||
| pH | 2 | 0 | 0 | ||
| NOAEL Static 48Hr Acute D. pulex | 2 | 0 | 0 | ||
| NOAEL Static 48Hr Acute Pimephales promelas | 2 | 0 | 0 | ||
| Phosphorus, total [as P] | 1 | 0 | 0 | ||
| Ultraviolet light dosage | 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
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| November 9, 2021 | WW SSO - Improper Operation and Maintenance | ST6 |
| September 10, 2021 | Management Practice Violations - Improper Operation and Maintenance | 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 CT0101281 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.