Clean Water Act discharge permit · NPDES MA0102466
MIDDLESEX SCHOOL WWTP, Concord, MA: NPDES MA0102466 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 15Pollutants under a numeric limit
- 16Pollutants with an effluent exceedance
MIDDLESEX SCHOOL WWTP holds NPDES permit MA0102466, which discharges to Spencer Brook To Assabet R. EPA’s file records it issued March 3, 2005 and expiring April 30, 2010. 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 | MIDDLESEX SCHOOL WWTP |
|---|---|
| Permittee as filed | MIDDLESEX SCHOOL WWTP |
| NPDES ID | MA0102466 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | March 3, 2005 |
| Expiration date | April 30, 2010 |
| Address | Concord, MA 01742 |
| Receiving water | SPENCER BROOK TO ASSABET R |
| Subwatershed | Elizabeth Brook-Assabet River (HUC 010700050204) |
| 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
- 18Pollutants on file
- 15Under a numeric limit
- 18With a violation of any kind
- 16With 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] | 1 | 117 | 113 | March 31, 2022 | 1,790% over the limit |
| Chlorine, total residual | 2 | 92 | 80 | February 28, 2019 | 3,233% over the limit |
| pH | 2 | 63 | 55 | August 31, 2021 | |
| Phosphorus, total [as P] | 4 | 63 | 54 | October 31, 2018 | 1,150% over the limit |
| BOD, 5-day, 20 deg. C | 7 | 80 | 47 | March 31, 2022 | 1,600% over the limit |
| Solids, total suspended | 7 | 57 | 26 | June 30, 2015 | 172% over the limit |
| Nitrogen, ammonia total [as N] | 4 | 35 | 25 | September 30, 2017 | 2,800% over the limit |
| Aluminum, total [as Al] | 0 | 23 | 21 | July 31, 2018 | 291% over the limit |
| Coliform, fecal general | 2 | 23 | 16 | May 31, 2005 | 100% over the limit |
| Oxygen, dissolved [DO] | 2 | 14 | 10 | July 31, 2021 | 18% over the limit |
| Solids, settleable | 0 | 12 | 4 | March 31, 2004 | 6,567% over the limit |
| BOD, 5-day, percent removal | 1 | 9 | 4 | November 30, 2015 | 560% over the limit |
| Flow, in conduit or thru treatment plant | 2 | 14 | 3 | September 30, 2007 | 32,171,054% over the limit |
| Solids, suspended percent removal | 1 | 7 | 2 | May 31, 2006 | 560% over the limit |
| NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia | 1 | 6 | 2 | March 31, 2021 | 100% over the limit |
| E. coli, colony forming units [CFU] | 0 | 4 | 2 | January 31, 2019 | 88% over the limit |
| Phosphate, ortho [as PO4] | 2 | 4 | 0 | ||
| LC50 Static 48Hr Acute Ceriodaphnia dubia | 1 | 4 | 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 MA0102466.
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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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 MA0102466 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 October 14, 2026.