Clean Water Act discharge permit · NPDES CTP000118
DONCASTERS INC, Groton, CT: NPDES CTP000118 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 18Pollutants under a numeric limit
- 10Pollutants with an effluent exceedance
DONCASTERS INC holds NPDES permit CTP000118, which discharges to Thames River. EPA’s file records it issued December 12, 2011 and expiring December 31, 2016. 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 | DONCASTERS INC |
|---|---|
| Permittee as filed | DONCASTERS INC |
| NPDES ID | CTP000118 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual industrial user permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | December 12, 2011 |
| Expiration date | December 31, 2016 |
| Issuing agency | CT DEP |
| Address | Groton, CT 06340 |
| Receiving water | THAMES RIVER |
| Other EPA IDs (FRS) | RCRA handler CTR000008276; ICIS-AIR source CT0000000901109006 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 23Pollutants on file
- 18Under a numeric limit
- 23With a violation of any kind
- 10With 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 | 6 | 73 | 31 | February 28, 2025 | 356% over the limit |
| Flow, maximum during 24 hr period | 4 | 60 | 8 | September 30, 2025 | 81% over the limit |
| Oil petroleum, total recoverable | 6 | 54 | 6 | July 31, 2023 | 132% over the limit |
| pH | 8 | 92 | 5 | December 31, 2018 | |
| Flow | 2 | 48 | 3 | April 30, 2019 | 463% over the limit |
| Zinc, total [as Zn] | 8 | 72 | 2 | March 31, 2017 | 17% over the limit |
| Silver, total [as Ag] | 8 | 58 | 2 | September 30, 2012 | 29% over the limit |
| Oil & Grease | 0 | 2 | 2 | February 28, 2010 | 1,000% over the limit |
| Copper, total [as Cu] | 8 | 81 | 1 | July 31, 2019 | 9% over the limit |
| pH, minimum | 2 | 18 | 1 | June 30, 2023 | |
| Nickel, total [as Ni] | 8 | 83 | 0 | ||
| Lead, total [as Pb] | 8 | 58 | 0 | ||
| Chromium, total [as Cr] | 8 | 50 | 0 | ||
| Organics, total toxic [TTO] | 4 | 37 | 0 | ||
| pH, maximum | 2 | 19 | 0 | ||
| Cadmium, total [as Cd] | 8 | 18 | 0 | ||
| Cyanide, total [as CN] | 6 | 13 | 0 | ||
| Oxygen demand, chem. [COD], dissolved | 0 | 8 | 0 | ||
| BOD, 5-day, 20 deg. C | 2 | 7 | 0 | ||
| Oxygen demand, chem. [low level] [COD] | 2 | 6 | 0 | ||
| Flow rate | 0 | 6 | 0 | ||
| Chromium, hexavalent [as Cr] | 0 | 2 | 0 | ||
| Duration of discharge | 0 | 2 | 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
- 12Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| March 18, 2026 | Management Practice Violations - Failure to Maintain Records | ST6 |
| March 18, 2026 | Effluent Violations - Numeric effluent violation | ST6 |
| January 9, 2025 | Permit Violations - Violation Specified in Comment | ST6 |
| January 9, 2025 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| January 9, 2025 | Reporting Violations - Failure to Notify | ST6 |
| January 9, 2025 | Management Practice Violations - Failure to Maintain Records | ST6 |
| January 9, 2025 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| March 20, 2024 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| March 20, 2024 | Permit Violations - Violation Specified in Comment | ST6 |
| March 20, 2024 | Reporting Violations - Late Submittal of DMRs | ST6 |
| March 20, 2024 | Effluent Violations - Numeric effluent violation | ST6 |
| March 20, 2024 | Reporting Violations - Failure to Notify | 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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, CTP000118.
Start the watch
- One permit holder — $99/month
- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
How we handle your data → Privacy
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 CTP000118 there.
Nearby on the register
- Discharge permits in Groton
- Every permit record in Groton, A to Z
- Discharge permits in Connecticut
- Every permit record in Connecticut, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.