Clean Water Act discharge permit · NPDES MA0101150
MERRIMAC W W T P, Merrimac, MA: NPDES MA0101150 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 10Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
MERRIMAC W W T P holds NPDES permit MA0101150, which discharges to Merrimack River. EPA’s file records it issued October 30, 2006 and expiring December 31, 2011. 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 | MERRIMAC W W T P |
|---|---|
| Permittee as filed | MERRIMAC W W T P |
| NPDES ID | MA0101150 |
| 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 | October 30, 2006 |
| Expiration date | December 31, 2011 |
| Address | Merrimac, MA 01860 |
| Receiving water | MERRIMACK RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | East Meadow River-Merrimack River (HUC 010700061404) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 21Pollutants on file
- 10Under a numeric limit
- 20With 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 |
|---|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 7 | 35 | 24 | August 31, 2002 | 627% over the limit |
| Solids, total suspended | 7 | 26 | 17 | October 31, 2004 | 340% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 16 | 13 | September 30, 2006 | 40% over the limit |
| Coliform, fecal general | 2 | 17 | 9 | May 31, 2002 | 367% over the limit |
| Solids, suspended percent removal | 1 | 10 | 7 | May 31, 2004 | 202% over the limit |
| pH | 2 | 10 | 4 | May 31, 2015 | |
| Chlorine, total residual | 0 | 12 | 3 | April 30, 2003 | 42,900% over the limit |
| BOD, 5-day, percent removal | 1 | 4 | 2 | November 30, 1999 | 12% over the limit |
| Arsenic total, dry weight, sludge | 0 | 4 | 1 | March 31, 1998 | 33% over the limit |
| LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia) | 1 | 4 | 0 | ||
| Selenium, sludge, total, dry weight [as Se] | 0 | 4 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 0 | 4 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 0 | 4 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 0 | 4 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 0 | 4 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 0 | 4 | 0 | ||
| Copper, sludge, total, dry weight [as Cu] | 0 | 4 | 0 | ||
| Cadmium, sludge, total, dry weight [as Cd] | 0 | 4 | 0 | ||
| LC50 Static 48Hr Acute Menidia | 0 | 3 | 0 | ||
| E. coli, thermotol, MF, MTEC | 1 | 1 | 0 | ||
| Flow, total | 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 MA0101150.
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, MA0101150.
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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 MA0101150 there.
Nearby on the register
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- Every permit record in Merrimac, A to Z
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- Every permit record in Massachusetts, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.