Clean Water Act discharge permit · NPDES MAG580039
CHARLTON W W T P, Charlton, MA: NPDES MAG580039 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 30Pollutants under a numeric limit
- 11Pollutants with an effluent exceedance
CHARLTON W W T P, held by CHARLTON WASTEWATER TREATMENT FACILITY, holds NPDES permit MAG580039, which discharges to Quinebaug River - Cady Brook. EPA’s file records it issued December 1, 2021 and expiring November 30, 2026. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | CHARLTON W W T P |
|---|---|
| Permittee as filed | CHARLTON WASTEWATER TREATMENT FACILITY |
| NPDES ID | MAG580039 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | December 1, 2021 |
| Expiration date | November 30, 2026 |
| Address | Charlton, MA 01509 |
| Receiving water | QUINEBAUG RIVER - CADY BROOK |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Cady Brook-Quinebaug River (HUC 011000010104) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 30Pollutants on file
- 30Under a numeric limit
- 26With a violation of any kind
- 11With 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 |
|---|---|---|---|---|---|
| Solids, total suspended | 11 | 25 | 25 | July 31, 2026 | 434% over the limit |
| E. coli | 2 | 22 | 22 | July 31, 2026 | 99,999% over the limit |
| Nitrogen, ammonia total [as N] | 7 | 17 | 11 | July 31, 2026 | 1,104% over the limit |
| Phosphorus, total [as P] | 4 | 10 | 9 | July 31, 2026 | 1,255% over the limit |
| Copper, total [as Cu] | 4 | 13 | 7 | July 31, 2026 | 123% over the limit |
| pH | 3 | 9 | 6 | July 31, 2026 | |
| Solids, suspended percent removal | 1 | 3 | 3 | February 28, 2026 | 567% over the limit |
| NOEC Static Renewal 7Day Chronic Ceriodaphnia dubia | 1 | 5 | 2 | June 30, 2025 | 89% over the limit |
| LC50 Static 48Hr Acute Ceriodaphnia dubia | 1 | 5 | 2 | June 30, 2025 | 85% over the limit |
| BOD, 5-day, 20 deg. C | 11 | 2 | 2 | April 30, 2026 | 21% over the limit |
| BOD, 5-day, percent removal | 1 | 1 | 1 | August 31, 2025 | 567% over the limit |
| Perfluorooctanoic acid (PFOA) | 3 | 9 | 0 | ||
| Perfluoroheptanoic acid (PFHpA) | 3 | 9 | 0 | ||
| Perfluorononanoic acid (PFNA) | 3 | 9 | 0 | ||
| Perfluorodecanoic acid (PFDA) | 3 | 9 | 0 | ||
| Perfluorohexanesulfonic acid (PFHxS) | 3 | 9 | 0 | ||
| Perfluorooctanesulfonic acid (PFOS) | 3 | 9 | 0 | ||
| Cadmium, total [as Cd] | 4 | 8 | 0 | ||
| Lead, total [as Pb] | 4 | 6 | 0 | ||
| Zinc, total [as Zn] | 4 | 6 | 0 | ||
| Aluminum, total [as Al] | 4 | 6 | 0 | ||
| Carbon, tot organic [TOC] | 2 | 6 | 0 | ||
| Hardness, total [as CaCO3] | 2 | 6 | 0 | ||
| Nickel, total [as Ni] | 2 | 6 | 0 | ||
| Temperature, water deg. centigrade | 1 | 3 | 0 | ||
| Carbon, dissolved organic [as C] | 1 | 3 | 0 | ||
| Nitrogen, total [as N] | 4 | 0 | 0 | ||
| Flow, in conduit or thru treatment plant | 3 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 0 | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES MAG580039.
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, MAG580039.
Start the watch
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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 MAG580039 there.
Nearby on the register
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- Every permit record in Massachusetts, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.