Clean Water Act discharge permit · NPDES CT0100455
PLAINVILLE WPCF, Plainville, CT: NPDES CT0100455 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 50Pollutants under a numeric limit
- 14Pollutants with an effluent exceedance
PLAINVILLE WPCF holds NPDES permit CT0100455, which discharges to Peqabuck River. EPA’s file records it issued July 10, 2015 and expiring July 31, 2020. 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 | PLAINVILLE WPCF |
|---|---|
| Permittee as filed | PLAINVILLE WPCF |
| NPDES ID | CT0100455 |
| 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 | July 10, 2015 |
| Expiration date | July 31, 2020 |
| Issuing agency | CT DEP |
| Address | Plainville, CT 06062 |
| Receiving water | PEQABUCK RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Pequabuck River (HUC 010802070404) |
| Program components on file | Biosolids, POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | ICIS-AIR source CT0000000900309157 |
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
- 53Pollutants on file
- 50Under a numeric limit
- 53With a violation of any kind
- 14With 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 |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 14 | 56 | 44 | August 31, 2025 | 437% over the limit |
| Solids, total suspended | 5 | 50 | 31 | March 31, 2025 | 1,071% over the limit |
| BOD, 5-day, 20 deg. C | 5 | 41 | 24 | March 31, 2025 | 900% over the limit |
| Phosphorus, total [as P] | 4 | 35 | 24 | October 31, 2025 | 13,287% over the limit |
| Solids, suspended percent removal | 1 | 25 | 22 | March 31, 2025 | 534% over the limit |
| Oxygen demand, ultimate | 2 | 24 | 19 | September 30, 2020 | 239% over the limit |
| BOD, 5-day, percent removal | 1 | 19 | 16 | March 31, 2025 | 897% over the limit |
| E. coli | 2 | 14 | 11 | July 31, 2023 | 99,999% over the limit |
| Coliform, fecal general | 2 | 15 | 10 | May 31, 2015 | 99,999% over the limit |
| Oxygen, dissolved [DO] | 1 | 8 | 4 | December 31, 2023 | 42% over the limit |
| Phosphorus, Total [Avg Seasonal Load Cap] | 1 | 13 | 2 | August 31, 2024 | 57% over the limit |
| Ultraviolet light intensity | 0 | 6 | 2 | May 31, 2025 | 100% over the limit |
| NOAEL Static 48Hr Acute D. pulex | 2 | 3 | 2 | January 31, 2023 | 7% over the limit |
| Flow, in conduit or thru treatment plant | 0 | 2 | 2 | March 31, 2011 | 9% over the limit |
| Flow rate | 2 | 11 | 0 | ||
| pH | 2 | 7 | 0 | ||
| BOD, carbonaceous [5 day, 5 C] | 0 | 4 | 0 | ||
| Chlorine, total residual | 2 | 3 | 0 | ||
| Nitrogen, nitrite total [as N] | 2 | 1 | 0 | ||
| Nitrogen, nitrate total [as N] | 2 | 1 | 0 | ||
| Cyanide, total [as CN] | 2 | 1 | 0 | ||
| Cyanide, free [amenable to chlorination] | 2 | 1 | 0 | ||
| Arsenic, total [as As] | 2 | 1 | 0 | ||
| Beryllium, total [as Be] | 2 | 1 | 0 | ||
| Cadmium, total [as Cd] | 2 | 1 | 0 | ||
| Chromium, hexavalent [as Cr] | 2 | 1 | 0 | ||
| Chromium, total [as Cr] | 2 | 1 | 0 | ||
| Copper, total [as Cu] | 2 | 1 | 0 | ||
| Iron, total [as Fe] | 2 | 1 | 0 | ||
| Lead, total [as Pb] | 2 | 1 | 0 | ||
| Thallium, total [as Tl] | 2 | 1 | 0 | ||
| Nickel, total [as Ni] | 2 | 1 | 0 | ||
| Silver, total [as Ag] | 2 | 1 | 0 | ||
| Zinc, total [as Zn] | 2 | 1 | 0 | ||
| Antimony, total [as Sb] | 2 | 1 | 0 | ||
| Aluminum, total [as Al] | 2 | 1 | 0 | ||
| Selenium, total [as Se] | 2 | 1 | 0 | ||
| Phenols | 2 | 1 | 0 | ||
| Mercury, total [as Hg] | 2 | 1 | 0 | ||
| NOAEL Static 48Hr Acute Pimephales promelas | 2 | 1 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 1 | 0 | ||
| Arsenic, sludge tot. dry wt [as As] | 1 | 1 | 0 | ||
| Beryllium, sludge, tot. dry wt [as Be] | 1 | 1 | 0 | ||
| Solids, total, percent | 1 | 1 | 0 | ||
| Solids, fixed, % of total solids | 1 | 1 | 0 | ||
| Solids, volatile % of total solids | 1 | 1 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 1 | 1 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 1 | 1 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 1 | 1 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 1 | 1 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 1 | 1 | 0 | ||
| Copper, sludge, total, dry weight [as Cu] | 1 | 1 | 0 | ||
| Cadmium, sludge, total, dry weight [as Cd] | 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
- 11Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| August 5, 2026 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| February 9, 2023 | Reporting Violations - Failure to Notify | ST6 |
| February 9, 2023 | Monitoring Violations - Analysis not Conducted | ST6 |
| February 9, 2023 | Monitoring Violations - Frequency of Sampling Violation | ST6 |
| January 31, 2022 | Effluent Violations - Numeric effluent violation | ST6 |
| January 31, 2022 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| January 31, 2022 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| July 1, 2021 | Monitoring Violations - Analysis not Conducted | ST6 |
| July 1, 2021 | Monitoring Violations - Frequency of Sampling Violation | ST6 |
| February 28, 2018 | Reporting Violations - Failure to submit required report (non-DMR non-pretreatment) | ST6 |
| February 28, 2018 | Monitoring Violations - Invalid/Unrepresentative Sample | 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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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.