Clean Water Act discharge permit · NPDES MA0100480
MARLBOROUGH WESTERLY W W T F, Marlborough, MA: NPDES MA0100480 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 19Pollutants under a numeric limit
- 19Pollutants with an effluent exceedance
MARLBOROUGH WESTERLY W W T F, held by MARLBOROUGH WESTERLY W W T P, holds NPDES permit MA0100480, which discharges to Assabet River. EPA’s file records it issued May 26, 2005 and expiring June 30, 2010. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | MARLBOROUGH WESTERLY W W T F |
|---|---|
| Permittee as filed | MARLBOROUGH WESTERLY W W T P |
| NPDES ID | MA0100480 |
| 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 | May 26, 2005 |
| Expiration date | June 30, 2010 |
| Address | Marlborough, MA 01752 |
| Receiving water | ASSABET RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Otter River (HUC 010802020201) |
| Other EPA IDs (FRS) | RCRA handler MAR000562843 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 25Pollutants on file
- 19Under a numeric limit
- 23With a violation of any kind
- 19With 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] | 4 | 47 | 46 | October 31, 2024 | 261% over the limit |
| Aluminum, total [as Al] | 2 | 33 | 33 | April 30, 2011 | 671% over the limit |
| pH | 4 | 32 | 31 | December 31, 2022 | |
| Solids, total suspended | 12 | 31 | 30 | June 30, 2024 | 202% over the limit |
| Phosphorus, total [as P] | 24 | 30 | 30 | June 30, 2023 | 700% over the limit |
| Coliform, fecal general | 2 | 24 | 24 | September 30, 2015 | 99,999% over the limit |
| Nitrogen, ammonia total [as N] | 7 | 18 | 17 | February 28, 2011 | 580% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 14 | 11 | 11 | June 30, 2024 | 70% over the limit |
| E. coli | 0 | 11 | 11 | April 30, 2026 | 140% over the limit |
| NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia | 1 | 10 | 9 | March 31, 2020 | 99,999% over the limit |
| Noel Statre 7Day Chronic Pimephales | 1 | 9 | 7 | June 30, 2011 | 99,999% over the limit |
| BOD, 5-day, 20 deg. C | 13 | 3 | 3 | March 31, 2001 | 490% over the limit |
| LC50 Static 48Hr Acute Ceriodaphnia dubia | 1 | 3 | 2 | March 31, 2008 | 29% over the limit |
| BOD, 5-day, percent removal | 1 | 2 | 2 | March 31, 2010 | 27% over the limit |
| Chlorine, total residual | 2 | 9 | 1 | March 31, 2010 | 213% over the limit |
| LC50 Static 48Hr Acute Pimephales promelas | 1 | 2 | 1 | March 31, 2004 | 30% over the limit |
| NOEL Static 7Day Chronic Ceriodaphnia dubia | 0 | 2 | 1 | June 30, 2023 | 99,999% over the limit |
| Flow, in conduit or thru treatment plant | 3 | 1 | 1 | March 31, 2001 | 11% over the limit |
| Solids, suspended percent removal | 1 | 1 | 1 | March 31, 2010 | 47% over the limit |
| Carbon, tot organic [TOC] | 0 | 1 | 0 | ||
| Hardness, total [as CaCO3] | 0 | 1 | 0 | ||
| Cadmium, total [as Cd] | 0 | 1 | 0 | ||
| Nickel, total [as Ni] | 0 | 1 | 0 | ||
| Phosphate, ortho, dissolved [as P] | 4 | 0 | 0 | ||
| Oxygen, dissolved [DO] | 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 MA0100480.
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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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 MA0100480 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 15, 2026.