NPDES CT0100455 · Clean Water Act
PLAINVILLE WPCF, Plainville, CT: NPDES CT0100455 discharge permit, effluent exceedances, inspections, penalties
PLAINVILLE WPCF, Plainville, Connecticut: Individual permit CT0100455; Publicly owned treatment works; Administratively continued; issued July 10, 2015, term to July 31, 2020, by CT DEP; discharges to PEQABUCK RIVER.
- Nitrogen, ammonia total [as N]: 14 limits, 56 violations of any kind, 44 effluent exceedances, latest August 31, 2025, largest 437% over the limit.
- Solids, total suspended: 5 limits, 50 violations of any kind, 31 effluent exceedances, latest March 31, 2025, largest 1,071% over the limit.
- BOD, 5-day, 20 deg. C: 5 limits, 41 violations of any kind, 24 effluent exceedances, latest March 31, 2025, largest 900% over the limit.
- Phosphorus, total [as P]: 4 limits, 35 violations of any kind, 24 effluent exceedances, latest October 31, 2025, largest 13,287% over the limit.
- Solids, suspended percent removal: 1 limit, 25 violations of any kind, 22 effluent exceedances, latest March 31, 2025, largest 534% over the limit.
- Oxygen demand, ultimate: 2 limits, 24 violations of any kind, 19 effluent exceedances, latest September 30, 2020, largest 239% over the limit.
- BOD, 5-day, percent removal: 1 limit, 19 violations of any kind, 16 effluent exceedances, latest March 31, 2025, largest 897% over the limit.
- E. coli: 2 limits, 14 violations of any kind, 11 effluent exceedances, latest July 31, 2023, largest 99,999% over the limit.
- Coliform, fecal general: 2 limits, 15 violations of any kind, 10 effluent exceedances, latest May 31, 2015, largest 99,999% over the limit.
- Oxygen, dissolved [DO]: 1 limit, 8 violations of any kind, 4 effluent exceedances, latest December 31, 2023, largest 42% over the limit.
- Phosphorus, Total [Avg Seasonal Load Cap]: 1 limit, 13 violations of any kind, 2 effluent exceedances, latest August 31, 2024, largest 57% over the limit.
- Ultraviolet light intensity: 0 limits, 6 violations of any kind, 2 effluent exceedances, latest May 31, 2025, largest 100% over the limit.
- NOAEL Static 48Hr Acute D. pulex: 2 limits, 3 violations of any kind, 2 effluent exceedances, latest January 31, 2023, largest 7% over the limit.
- Flow, in conduit or thru treatment plant: 0 limits, 2 violations of any kind, 2 effluent exceedances, latest March 31, 2011, largest 9% over the limit.
- Flow rate: 2 limits, 11 violations of any kind.
- pH: 2 limits, 7 violations of any kind.
- BOD, carbonaceous [5 day, 5 C]: 0 limits, 4 violations of any kind.
- Chlorine, total residual: 2 limits, 3 violations of any kind.
- Nitrogen, nitrite total [as N]: 2 limits, 1 violation of any kind.
- Nitrogen, nitrate total [as N]: 2 limits, 1 violation of any kind.
- Cyanide, total [as CN]: 2 limits, 1 violation of any kind.
- Cyanide, free [amenable to chlorination]: 2 limits, 1 violation of any kind.
- Arsenic, total [as As]: 2 limits, 1 violation of any kind.
- Beryllium, total [as Be]: 2 limits, 1 violation of any kind.
- Cadmium, total [as Cd]: 2 limits, 1 violation of any kind.
- Chromium, hexavalent [as Cr]: 2 limits, 1 violation of any kind.
- Chromium, total [as Cr]: 2 limits, 1 violation of any kind.
- Copper, total [as Cu]: 2 limits, 1 violation of any kind.
- Iron, total [as Fe]: 2 limits, 1 violation of any kind.
- Lead, total [as Pb]: 2 limits, 1 violation of any kind.
- Thallium, total [as Tl]: 2 limits, 1 violation of any kind.
- Nickel, total [as Ni]: 2 limits, 1 violation of any kind.
- Silver, total [as Ag]: 2 limits, 1 violation of any kind.
- Zinc, total [as Zn]: 2 limits, 1 violation of any kind.
- Antimony, total [as Sb]: 2 limits, 1 violation of any kind.
- Aluminum, total [as Al]: 2 limits, 1 violation of any kind.
- Selenium, total [as Se]: 2 limits, 1 violation of any kind.
- Phenols: 2 limits, 1 violation of any kind.
- Mercury, total [as Hg]: 2 limits, 1 violation of any kind.
- NOAEL Static 48Hr Acute Pimephales promelas: 2 limits, 1 violation of any kind.
- Polychlorinated biphenyls [PCBs]: 1 limit, 1 violation of any kind.
- Arsenic, sludge tot. dry wt [as As]: 1 limit, 1 violation of any kind.
- Beryllium, sludge, tot. dry wt [as Be]: 1 limit, 1 violation of any kind.
- Solids, total, percent: 1 limit, 1 violation of any kind.
- Solids, fixed, % of total solids: 1 limit, 1 violation of any kind.
- Solids, volatile % of total solids: 1 limit, 1 violation of any kind.
- Zinc, sludge, total, dry weight [as Zn]: 1 limit, 1 violation of any kind.
- Lead, sludge, total, dry weight [as Pb]: 1 limit, 1 violation of any kind.
- Nickel, sludge, total, dry weight [as Ni]: 1 limit, 1 violation of any kind.
- Mercury, sludge, total, dry weight [as Hg]: 1 limit, 1 violation of any kind.
- Chromium, sludge, total, dry weight [as Cr]: 1 limit, 1 violation of any kind.
- Copper, sludge, total, dry weight [as Cu]: 1 limit, 1 violation of any kind.
- Cadmium, sludge, total, dry weight [as Cd]: 1 limit, 1 violation of any kind.
- August 5, 2026: Management Practice Violations - Improper Operation and Maintenance (ST6).
- August 5, 2026: Evaluation (S).
- March 4, 2026: Notice of Violation (State).
- 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).
Connecticut holds 84 Publicly owned treatment works coverages of this permit type in EPA’s file; 65 were issued before CT0100455.
Coverages issued nearest CT0100455
- 2014-09-23: LEDYARD WPC AUTHORITY, Ledyard: CT0101681, held by LEDYARD WATER POLLUTION
- 2014-10-30: DANBURY WPCF, Danbury: CT0100145
- 2014-11-17: ROCKY HILL WPCF, Rocky Hill: CT0100480
- 2015-05-01: STRATFORD WPCF, Stratford: CT0101036
- 2015-05-11: CITY OF TORRINGTON, Torrington: CT0100579, held by TORRINGTON WPCF
- 2015-08-18: NORFOLK SEWER DISTRICT, Norfolk: CT0101231
- 2015-09-04: SEYMOUR WPCF, TOWN OF, Seymour: CT0100501
- 2015-09-04: SHELTON, CITY OF, Shelton: CT0100714
- 2015-09-17: SALISBURY, TOWN OF, Salisbury: CT0100498
- 2015-09-28: MANCHESTER WPCF, Manchester: CT0100293, held by TOWN OF MANCHESTER
PLAINVILLE WPCF among its neighbors
12 discharge permits are in the Pequabuck River subwatershed (HUC 010802070404); CT0100455 is one. Its county: 209, 18 major; CT0100455 is major permit.
Other permits in the Pequabuck River subwatershed (HUC 010802070404)
- BRISTOL, Bristol: CTL100374, minor, term to 2025-12-31
- BRISTOL WATER RECLAMATION FACILITY, Bristol: CT0100374, major, term to 2018-06-30
- CT SPRING & STAMPING CORP, Farmington: CTRSW0012, minor, term to 2025-03-01
- FIRST STUDENT, INC. #11930, Bristol: CTR050188, minor, term to 2030-09-30
- J. F. FREDERICK TOOL COMPANY, INC., Farmington: CTGSI2585, minor, term to 2021-09-30
- PLAINVILLE WPCF, Plainville: CTL100455, minor, term to 2025-12-31
- PLYMOUTH WPCF, Pequabuck: CT0100463, major, term to 2011-01-31
- PLYMOUTH WPCF, Pequabuck: CTL100463, minor, term to 2025-12-31
- ROSS AUTO PARTS, Bristol: CTR050060, minor, term to 2030-09-30
- STANLEY ACCESS TECHNOLOGIES, Farmington: CTR050383, minor, term to 2030-09-30
Identity
| Facility | PLAINVILLE WPCF |
|---|---|
| Permittee | PLAINVILLE WPCF |
| NPDES ID | CT0100455 |
| Status | Administratively continued |
| Type | Individual permit |
| Class | Major |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | July 10, 2015 |
| Expires | July 31, 2020 |
| 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 |
NPDES CT0100455: effluent limits and exceedances
PLAINVILLE WPCF (NPDES CT0100455): 53 pollutants on file, 50 limited; 53 with a violation of any kind, 14 with an exceedance.
| Pollutant | Limits | Violations | Exceedances | Latest | Largest, 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 |
NPDES CT0100455: inspections, violations and enforcement
NPDES CT0100455: 11 single-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 |
NPDES CT0100455: 1 inspection
| Date | What EPA recorded | Agency |
|---|---|---|
| August 5, 2026 | Evaluation | S |
NPDES CT0100455: 1 informal enforcement action
| Date | What EPA recorded | Agency |
|---|---|---|
| March 4, 2026 | Notice of Violation | State |
NPDES CT0100455 (PLAINVILLE WPCF): no formal enforcement action on file.
Watch NPDES CT0100455
NPDES CT0100455: one email when its EPA record changes — $99/month.
Permits near NPDES CT0100455
NPDES CT0100455: 53 pollutant rows, 13 dated events; ICIS-NPDES download, loaded October 14, 2026.