Clean Water Act discharge permit · NPDES CT0003115
MONTVILLE POWER LLC, Uncasville, CT: NPDES CT0003115 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 28Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
MONTVILLE POWER LLC, held by MONTVILLE POWER LLC c/o EASTERN GENERATION LLC, holds NPDES permit CT0003115, which discharges to Thames River. EPA’s file records it issued February 28, 2001 and expiring February 27, 2006. 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 | MONTVILLE POWER LLC |
|---|---|
| Permittee as filed | MONTVILLE POWER LLC c/o EASTERN GENERATION LLC |
| NPDES ID | CT0003115 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | February 28, 2001 |
| Expiration date | February 27, 2006 |
| Issuing agency | CT DEP |
| Address | Uncasville, CT 06382 |
| Receiving water | THAMES RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Thames River-Frontal New London Harbor (HUC 011000030203) |
| Other EPA IDs (FRS) | RCRA handler CTD049181654; ICIS-AIR source CT0000000901100005 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 28Pollutants on file
- 28Under a numeric limit
- 28With a violation of any kind
- 8With 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 rate | 7 | 137 | 132 | August 31, 2016 | 900% over the limit |
| Copper, total [as Cu] | 6 | 18 | 13 | December 31, 2003 | 318% over the limit |
| Nickel, total [as Ni] | 4 | 10 | 7 | December 31, 2023 | 260% over the limit |
| Iron, total [as Fe] | 4 | 8 | 5 | September 30, 2012 | 43% over the limit |
| pH | 32 | 8 | 4 | June 30, 2003 | |
| Solids, total suspended | 15 | 7 | 2 | July 31, 2025 | 28% over the limit |
| Temperature, water deg. fahrenheit | 8 | 2 | 2 | August 31, 2016 | 2% over the limit |
| Flow, maximum during 24 hr period | 7 | 2 | 1 | May 31, 2010 | 17% over the limit |
| Zinc, total [as Zn] | 5 | 7 | 0 | ||
| Oil & Grease | 13 | 6 | 0 | ||
| Lead, total [as Pb] | 6 | 5 | 0 | ||
| Nitrogen, nitrite total [as N] | 4 | 5 | 0 | ||
| Nitrogen, nitrate total [as N] | 4 | 5 | 0 | ||
| Flow | 10 | 4 | 0 | ||
| Vanadium, total [as V] | 4 | 4 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 4 | 0 | ||
| Chlorine, total residual | 11 | 3 | 0 | ||
| Nitrogen, ammonia total [as N] | 4 | 3 | 0 | ||
| Chromium, total [as Cr] | 4 | 3 | 0 | ||
| Flow rate | 7 | 2 | 0 | ||
| Duration of discharge | 5 | 2 | 0 | ||
| LF Pass/Fail Static Renewal 7Day Chronic Americamysis bahia (formerly Mysidopsis bahia) | 4 | 2 | 0 | ||
| LF Pass/Fail Statre 7Day Chronic Cyprinodon Variega | 4 | 2 | 0 | ||
| Hydrazine | 3 | 2 | 0 | ||
| Fluoride, total [as F] | 2 | 2 | 0 | ||
| Aluminum, total [as Al] | 2 | 2 | 0 | ||
| Pass/Fail Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | 2 | 1 | 0 | ||
| Pass/Fail Static 96 Hr Acute Cyprinodon Variega | 2 | 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
- 12Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| June 8, 2026 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| June 8, 2026 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| June 8, 2026 | Reporting Violations - Failure to Notify | ST6 |
| June 8, 2026 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| September 21, 2023 | Effluent Violations - Industrial Spill | ST6 |
| September 21, 2023 | Management Practice Violations - Failure to Maintain Records | ST6 |
| September 21, 2023 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| September 21, 2023 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| September 21, 2023 | Monitoring Violations - Failure to Monitor for Non-Toxicity Requirements | ST6 |
| December 16, 2021 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| May 30, 2018 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| May 30, 2018 | Permit Violations - Violation Specified in Comment | 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 CT0003115 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.