Clean Water Act discharge permit · NPDES CT0100439
PLAINFIELD VILLAGE STP, Plainfield, CT: NPDES CT0100439 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 28Pollutants under a numeric limit
- 13Pollutants with an effluent exceedance
PLAINFIELD VILLAGE STP holds NPDES permit CT0100439, which discharges to Mill Brook-Quinebaug River. EPA’s file records it issued August 10, 2012 and expiring August 31, 2017. 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 | PLAINFIELD VILLAGE STP |
|---|---|
| Permittee as filed | PLAINFIELD VILLAGE STP |
| NPDES ID | CT0100439 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | August 10, 2012 |
| Expiration date | August 31, 2017 |
| Issuing agency | CT DEP |
| Address | Plainfield, CT 06374 |
| Receiving water | MILL BROOK-QUINEBAUG RIVER |
| Subwatershed | Mill Brook (HUC 011000010702) |
| Program components on file | Biosolids, POTW, Pretreatment |
| SIC | 4952 – Sewerage Systems |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 31Pollutants on file
- 28Under a numeric limit
- 31With a violation of any kind
- 13With 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 |
|---|---|---|---|---|---|
| Copper, total [as Cu] | 0 | 20 | 20 | February 28, 2011 | 375% over the limit |
| BOD, 5-day, 20 deg. C | 3 | 19 | 19 | September 30, 2024 | 638% over the limit |
| E. coli | 2 | 11 | 11 | September 30, 2020 | 4,503% over the limit |
| Nitrogen, ammonia total [as N] | 4 | 10 | 9 | September 30, 2021 | 437% over the limit |
| BOD, 5-day, percent removal | 1 | 10 | 9 | September 30, 2024 | 630% over the limit |
| Phosphorus, total [as P] | 5 | 9 | 9 | August 31, 2022 | 33% over the limit |
| Coliform, fecal general | 2 | 27 | 5 | September 30, 2014 | 4,625% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 5 | 5 | May 31, 2010 | 87,453% over the limit |
| Silver, total [as Ag] | 2 | 4 | 4 | December 31, 2013 | 103% over the limit |
| Solids, suspended percent removal | 1 | 3 | 2 | March 31, 2005 | 20% over the limit |
| Solids, total suspended | 3 | 2 | 2 | August 31, 2015 | 15% over the limit |
| pH | 2 | 2 | 2 | February 29, 2024 | |
| Chlorine, total residual | 2 | 1 | 1 | September 30, 2003 | 6% over the limit |
| Phosphorus, Total [Avg Seasonal Load Cap] | 1 | 7 | 0 | ||
| Cyanide, free [amenable to chlorination] | 0 | 4 | 0 | ||
| NOAEL Static 48Hr Acute D. pulex | 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 | ||
| Arsenic, total [as As] | 0 | 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
- 2Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 15, 2022 | Effluent Violations - Numeric effluent violation | ST6 |
| September 15, 2022 | Management Practice Violations - Improper Operation and Maintenance | 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.