Clean Water Act discharge permit · NPDES CT0100242
GROTON WPCF, Groton, CT: NPDES CT0100242 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 26Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
GROTON WPCF, held by GROTON WPCF TOWN OF, holds NPDES permit CT0100242, which discharges to Thames River. EPA’s file records it issued May 15, 2012 and expiring May 31, 2017. 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 | GROTON WPCF |
|---|---|
| Permittee as filed | GROTON WPCF TOWN OF |
| NPDES ID | CT0100242 |
| 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 | May 15, 2012 |
| Expiration date | May 31, 2017 |
| Issuing agency | CT DEP |
| Address | Groton, CT 06340 |
| Receiving water | THAMES RIVER |
| Subwatershed | Stony Brook-Frontal Fishers Island Sound (HUC 011000030303) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 27Pollutants on file
- 26Under a numeric limit
- 27With a violation of any kind
- 9With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 3 | 55 | 52 | June 30, 2026 | 414% over the limit |
| BOD, 5-day, 20 deg. C | 3 | 28 | 25 | April 30, 2026 | 170% over the limit |
| Chlorine, total residual | 2 | 23 | 20 | March 31, 2025 | 108% over the limit |
| Coliform, fecal general | 2 | 21 | 17 | June 30, 2008 | 156% over the limit |
| Enterococci | 2 | 16 | 14 | May 31, 2026 | 99,999% over the limit |
| Solids, suspended percent removal | 1 | 8 | 7 | May 31, 2026 | 173% over the limit |
| BOD, 5-day, percent removal | 1 | 6 | 5 | April 30, 2010 | 93% over the limit |
| pH | 2 | 6 | 4 | January 31, 2010 | |
| Coliform, fecal - % samples exceeding limit | 2 | 4 | 3 | May 31, 2026 | 130% over the limit |
| Flow | 2 | 3 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 2 | 0 | ||
| Arsenic, sludge tot. dry wt [as As] | 1 | 2 | 0 | ||
| Beryllium, sludge, tot. dry wt [as Be] | 1 | 2 | 0 | ||
| Solids, total, percent | 1 | 2 | 0 | ||
| Solids, fixed, % of total solids | 1 | 2 | 0 | ||
| Solids, volatile % of total solids | 1 | 2 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 1 | 2 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 1 | 2 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 1 | 2 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 1 | 2 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 1 | 2 | 0 | ||
| Copper, sludge, total, dry weight [as Cu] | 1 | 2 | 0 | ||
| Cadmium, sludge, total, dry weight [as Cd] | 1 | 2 | 0 | ||
| Flow rate | 0 | 2 | 0 | ||
| NOAEL Static 48Hr Acute D. pulex | 2 | 1 | 0 | ||
| NOAEL Static 48Hr Acute Pimephales promelas | 2 | 1 | 0 | ||
| Phosphorus, total [as P] | 1 | 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
- 5Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 17, 2026 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| June 17, 2026 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| June 26, 2024 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| June 26, 2024 | Monitoring Violations - Analysis not Conducted | ST6 |
| June 26, 2024 | 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 CT0100242 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.