Clean Water Act discharge permit · NPDES MAG580033
COHASSET W W T P, Cohasset, MA: NPDES MAG580033 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 28Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
COHASSET W W T P, held by Cohasset W W T P, holds NPDES permit MAG580033. EPA’s file records it issued September 28, 2021 and expiring November 30, 2026. 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 | COHASSET W W T P |
|---|---|
| Permittee as filed | Cohasset W W T P |
| NPDES ID | MAG580033 |
| 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 | September 28, 2021 |
| Expiration date | November 30, 2026 |
| Address | Cohasset, MA 02025 |
| Subwatershed | Bound Brook-Frontal The Gulf (HUC 010900020103) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 28Pollutants on file
- 28Under a numeric limit
- 13With a violation of any kind
- 9With 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 |
|---|---|---|---|---|---|
| Coliform, fecal general | 2 | 34 | 32 | July 31, 2026 | 547,914% over the limit |
| BOD, 5-day, 20 deg. C | 6 | 12 | 6 | July 31, 2026 | 450% over the limit |
| Solids, total suspended | 6 | 12 | 6 | July 31, 2026 | 720% over the limit |
| Enterococci | 2 | 6 | 4 | July 31, 2026 | 476,769% over the limit |
| BOD, 5-day, percent removal | 1 | 5 | 4 | July 31, 2026 | 493% over the limit |
| Solids, suspended percent removal | 1 | 4 | 3 | July 31, 2026 | 260% over the limit |
| Nitrogen, total [as N] | 6 | 12 | 2 | July 31, 2026 | 240% over the limit |
| LC50 Static 48Hr Acute Menidia | 1 | 2 | 2 | June 30, 2026 | 99,999% over the limit |
| LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | 1 | 1 | 1 | June 30, 2026 | 99,999% over the limit |
| Flow, in conduit or thru treatment plant | 3 | 3 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 3 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 3 | 0 | ||
| pH | 3 | 2 | 0 | ||
| Perfluorooctanoic acid (PFOA) | 3 | 0 | 0 | ||
| Perfluoroheptanoic acid (PFHpA) | 3 | 0 | 0 | ||
| Perfluorononanoic acid (PFNA) | 3 | 0 | 0 | ||
| Perfluorodecanoic acid (PFDA) | 3 | 0 | 0 | ||
| Perfluorohexanesulfonic acid (PFHxS) | 3 | 0 | 0 | ||
| Perfluorooctanesulfonic acid (PFOS) | 3 | 0 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 0 | 0 | ||
| Carbon, tot organic [TOC] | 2 | 0 | 0 | ||
| Cadmium, total [as Cd] | 2 | 0 | 0 | ||
| Copper, total [as Cu] | 2 | 0 | 0 | ||
| Lead, total [as Pb] | 2 | 0 | 0 | ||
| Nickel, total [as Ni] | 2 | 0 | 0 | ||
| Zinc, total [as Zn] | 2 | 0 | 0 | ||
| Temperature, water deg. centigrade | 1 | 0 | 0 | ||
| Salinity | 1 | 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 MAG580033.
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
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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 MAG580033 there.
Nearby on the register
- Discharge permits in Cohasset
- Every permit record in Cohasset, A to Z
- Discharge permits in Massachusetts
- Every permit record in Massachusetts, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.