Clean Water Act discharge permit · NPDES CTR050144
U.S. NAVAL SUBMARINE BASE NEW LONDON (SUBASENLON), Groton, CT: NPDES CTR050144 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 33Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
U.S. NAVAL SUBMARINE BASE NEW LONDON (SUBASENLON), held by UNITED STATES NAVAL SUBMARINE BASE NEW LONDON, holds NPDES permit CTR050144. EPA’s file records it issued July 20, 2026 and expiring September 30, 2030. 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.
What the register holds for U.S. NAVAL SUBMARINE BASE NEW LONDON (SUBASENLON): its NPDES ID, its permit type and status, its dates, its address in Groton, Connecticut, and 33 pollutants under a numeric limit. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES CTR050144.
Identity
| Facility as filed | U.S. NAVAL SUBMARINE BASE NEW LONDON (SUBASENLON) |
|---|---|
| Permittee as filed | UNITED STATES NAVAL SUBMARINE BASE NEW LONDON |
| NPDES ID | CTR050144 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Federal facility |
| Program | Industrial stormwater |
| Issued | July 20, 2026 |
| Expiration date | September 30, 2030 |
| Issuing agency | CT DEEP |
| Address | Groton, CT 06340 |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Thames River-Frontal New London Harbor (HUC 011000030203) |
| Other EPA IDs (FRS) | RCRA handler CT4170022020; ICIS-AIR source CT0000000901100628 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 33Pollutants on file
- 33Under a numeric limit
- 0With a violation of any kind
- 0With 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 |
|---|---|---|---|---|---|
| pH | 24 | 0 | 0 | ||
| Solids, total suspended | 12 | 0 | 0 | ||
| Oil & Grease | 12 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 12 | 0 | 0 | ||
| Phosphorous, total recoverable | 12 | 0 | 0 | ||
| Zinc, total recoverable | 12 | 0 | 0 | ||
| Lead, total recoverable | 12 | 0 | 0 | ||
| Copper, total recoverable | 12 | 0 | 0 | ||
| Nitrogen, nitrate total [as NO3] | 12 | 0 | 0 | ||
| Chemical Oxygen Demand [COD] | 12 | 0 | 0 | ||
| Conductivity | 6 | 0 | 0 | ||
| Hardness, total [as CaCO3] | 6 | 0 | 0 | ||
| Iron, total recoverable | 6 | 0 | 0 | ||
| Aluminum, total recoverable | 6 | 0 | 0 | ||
| Acenaphthylene | 6 | 0 | 0 | ||
| Acenaphthene | 6 | 0 | 0 | ||
| Anthracene | 6 | 0 | 0 | ||
| Benzo[b]fluoranthene | 6 | 0 | 0 | ||
| Benzo[k]fluoranthene | 6 | 0 | 0 | ||
| Benzo[a]pyrene | 6 | 0 | 0 | ||
| Chrysene | 6 | 0 | 0 | ||
| Fluoranthene | 6 | 0 | 0 | ||
| Fluorene | 6 | 0 | 0 | ||
| Indeno[1,2,3-cd]pyrene | 6 | 0 | 0 | ||
| Phenanthrene | 6 | 0 | 0 | ||
| Pyrene | 6 | 0 | 0 | ||
| Benzo[ghi]perylene | 6 | 0 | 0 | ||
| Benzo[a]anthracene | 6 | 0 | 0 | ||
| Dibenz[a,h]anthracene | 6 | 0 | 0 | ||
| Naphthalene | 6 | 0 | 0 | ||
| LC50 Static 48Hr Acute D. Pulex | 6 | 0 | 0 | ||
| NOAEL Static 48Hr Acute D. pulex | 6 | 0 | 0 | ||
| %Surv Static 48Hr Acute Daphnia Pulex | 6 | 0 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES CTR050144.
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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES CTR050144.
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, CTR050144.
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 CTR050144 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.