Clean Water Act discharge permit · NPDES CT0030333
THAMES SHIPYARD NORTH,NEW LONO, New London, CT: NPDES CT0030333 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 10Pollutants under a numeric limit
- 1Pollutants with an effluent exceedance
THAMES SHIPYARD NORTH,NEW LONO, held by The Thames Shipyard & Repair Company, holds NPDES permit CT0030333, which discharges to Thames River. EPA’s file records it issued May 24, 2019 and expiring May 31, 2024. 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 | THAMES SHIPYARD NORTH,NEW LONO |
|---|---|
| Permittee as filed | The Thames Shipyard & Repair Company |
| NPDES ID | CT0030333 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | May 24, 2019 |
| Expiration date | May 31, 2024 |
| Issuing agency | CT DEP |
| Address | New London, CT 06320 |
| Receiving water | THAMES RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Thames River-Frontal New London Harbor (HUC 011000030203) |
| NAICS | 811310 – Commercial & Industrial Machinery & Equipment [except Automotive & Electronic] Repair & Maintenance |
| SIC | 3731 – Ship Building And Repairing |
| Other EPA IDs (FRS) | RCRA handler CTR000007203; ICIS-AIR source CT0000000901105039 |
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
- 25Pollutants on file
- 10Under a numeric limit
- 24With a violation of any kind
- 1With 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 |
|---|---|---|---|---|---|
| Flow, maximum during 24 hr period | 2 | 2 | 2 | June 30, 2016 | 31,573,974% over the limit |
| pH | 8 | 4 | 0 | ||
| Zinc, total [as Zn] | 8 | 4 | 0 | ||
| Copper, total [as Cu] | 8 | 3 | 0 | ||
| Solids, total suspended | 2 | 3 | 0 | ||
| Iron, total [as Fe] | 2 | 3 | 0 | ||
| LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | 2 | 3 | 0 | ||
| LC50 Static 48Hr Acute Menidia | 2 | 3 | 0 | ||
| Nitrogen, total [as N] | 0 | 3 | 0 | ||
| Nitrogen, nitrite total [as N] | 0 | 3 | 0 | ||
| Nitrogen, nitrate total [as N] | 0 | 3 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 0 | 3 | 0 | ||
| Temperature, water deg. fahrenheit | 0 | 2 | 0 | ||
| Oxygen, dissolved [DO] | 0 | 2 | 0 | ||
| Alkalinity, total [as CaCO3] | 0 | 2 | 0 | ||
| Salinity | 0 | 2 | 0 | ||
| Nitrogen, ammonia total [as N] | 0 | 2 | 0 | ||
| Hardness, total [as CaCO3] | 0 | 2 | 0 | ||
| Copper, dissolved [as Cu] | 0 | 2 | 0 | ||
| Zinc, dissolved [as Zn] | 0 | 2 | 0 | ||
| Chlorine, total residual | 0 | 2 | 0 | ||
| Specific Conductance | 0 | 2 | 0 | ||
| Date of Sample Collection | 0 | 2 | 0 | ||
| Sulfate, total [as SO4] | 2 | 1 | 0 | ||
| Floating solids, waste or visible foam-visual | 2 | 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
- 9Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| July 9, 2026 | Management Practice Violations - Failure to Maintain Records | ST6 |
| July 9, 2026 | Effluent Violations - Narrative Effluent Violation | ST6 |
| July 9, 2026 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| October 27, 2023 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| October 27, 2023 | Management Practice Violations - Failure to Maintain Records | ST6 |
| September 29, 2021 | Permit Violations - Discharge Without a Valid Permit | ST6 |
| September 29, 2021 | Management Practice Violations - Failure to Maintain Records | ST6 |
| September 29, 2021 | Monitoring Violations - Failure to Monitor for Toxicity Requirements | ST6 |
| September 29, 2021 | Reporting Violations - Improper/ Incorrect Reporting | 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 CT0030333 there.
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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.