Clean Water Act discharge permit · NPDES MAG580010
MIDDLESEX SCHOOL WWTP, Concord, MA: NPDES MAG580010 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 32Pollutants under a numeric limit
- 11Pollutants with an effluent exceedance
MIDDLESEX SCHOOL WWTP, held by MIDDLESEX SCHOOL W W T P, holds NPDES permit MAG580010, which discharges to Spencer Brook. 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 (September 15, 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 W W T P |
| NPDES ID | MAG580010 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | September 28, 2021 |
| Expiration date | November 30, 2026 |
| Address | Concord, MA 01742 |
| Receiving water | SPENCER BROOK |
| Subwatershed | Elizabeth Brook-Assabet River (HUC 010700050204) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 32Pollutants on file
- 32Under a numeric limit
- 32With 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 |
|---|---|---|---|---|---|
| Copper, suspended [as Cu] | 2 | 80 | 70 | April 30, 2026 | 2,331% over the limit |
| Nitrogen, ammonia total [as N] | 5 | 57 | 39 | May 31, 2026 | 4,990% over the limit |
| Phosphorus, total [as P] | 6 | 39 | 14 | June 30, 2026 | 3,038% over the limit |
| BOD, 5-day, 20 deg. C | 6 | 37 | 7 | September 30, 2024 | 142% over the limit |
| Aluminum, total [as Al] | 4 | 21 | 7 | August 31, 2025 | 176% over the limit |
| LC50 Static 48Hr Acute Ceriodaphnia dubia | 1 | 9 | 7 | September 30, 2025 | 99,999% over the limit |
| NOEL Static 7Day Chronic Ceriodaphnia dubia | 1 | 8 | 6 | March 31, 2025 | 99,999% over the limit |
| Chlorine, total residual | 2 | 14 | 4 | September 30, 2022 | 242% over the limit |
| pH | 3 | 14 | 2 | July 31, 2023 | |
| Solids, total suspended | 6 | 31 | 1 | June 30, 2024 | 19% over the limit |
| BOD, 5-day, percent removal | 1 | 6 | 1 | December 31, 2024 | 23% over the limit |
| Flow, in conduit or thru treatment plant | 3 | 15 | 0 | ||
| Cadmium, total [as Cd] | 4 | 14 | 0 | ||
| E. coli | 2 | 10 | 0 | ||
| Perfluorooctanoic acid (PFOA) | 3 | 6 | 0 | ||
| Perfluoroheptanoic acid (PFHpA) | 3 | 6 | 0 | ||
| Perfluorononanoic acid (PFNA) | 3 | 6 | 0 | ||
| Perfluorodecanoic acid (PFDA) | 3 | 6 | 0 | ||
| Perfluorohexanesulfonic acid (PFHxS) | 3 | 6 | 0 | ||
| Perfluorooctanesulfonic acid (PFOS) | 3 | 6 | 0 | ||
| Nitrogen, total [as N] | 2 | 6 | 0 | ||
| Carbon, tot organic [TOC] | 2 | 6 | 0 | ||
| Solids, suspended percent removal | 1 | 5 | 0 | ||
| Hardness, total [as CaCO3] | 2 | 4 | 0 | ||
| Copper, total [as Cu] | 2 | 4 | 0 | ||
| Lead, total [as Pb] | 2 | 4 | 0 | ||
| Nickel, total [as Ni] | 2 | 4 | 0 | ||
| Zinc, total [as Zn] | 2 | 4 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 4 | 0 | ||
| Temperature, water deg. centigrade | 1 | 3 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 3 | 0 | ||
| Carbon, dissolved organic [as C] | 1 | 3 | 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 MAG580010.
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 MAG580010 there.
Nearby on the register
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- Discharge permits in Massachusetts
- Every permit record in Massachusetts, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.