Clean Water Act discharge permit · NPDES MA0100013
AYER W W T P, Ayer, MA: NPDES MA0100013 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 14Pollutants under a numeric limit
- 13Pollutants with an effluent exceedance
AYER W W T P holds NPDES permit MA0100013, which discharges to Nashua River. EPA’s file records it issued March 1, 2006 and expiring February 28, 2011. 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 | AYER W W T P |
|---|---|
| Permittee as filed | AYER W W T P |
| NPDES ID | MA0100013 |
| 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 | March 1, 2006 |
| Expiration date | February 28, 2011 |
| Address | Ayer, MA 01432 |
| Receiving water | NASHUA RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Mulpus Brook-Nashua River (HUC 010700040205) |
| Program components on file | Biosolids, POTW, Pretreatment |
| 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
- 16Pollutants on file
- 14Under a numeric limit
- 14With a violation of any kind
- 13With 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 | 56 | 54 | March 31, 2014 | 99,999% over the limit |
| Phosphorus, total [as P] | 8 | 39 | 37 | April 30, 2023 | 525% over the limit |
| Copper, total recoverable | 0 | 36 | 36 | April 30, 2023 | 257% over the limit |
| Chlorine, total residual | 2 | 32 | 30 | February 28, 2014 | 253,100% over the limit |
| Solids, total suspended | 9 | 57 | 12 | February 28, 2015 | 6,533% over the limit |
| BOD, 5-day, 20 deg. C | 9 | 66 | 9 | February 28, 2015 | 621% over the limit |
| Oxygen, dissolved [DO] | 1 | 9 | 9 | January 31, 2013 | 31% over the limit |
| pH | 2 | 9 | 7 | August 31, 2016 | |
| Copper, total [as Cu] | 2 | 6 | 4 | October 31, 2007 | 41% over the limit |
| NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia | 1 | 5 | 4 | June 30, 2018 | 91% over the limit |
| Flow, in conduit or thru treatment plant | 4 | 14 | 2 | April 30, 2001 | 16% over the limit |
| Aluminum, total recoverable | 0 | 3 | 2 | November 30, 2020 | 408% over the limit |
| BOD, 5-day, percent removal | 1 | 1 | 1 | April 30, 2005 | 8% over the limit |
| LC50 Static 48Hr Acute Ceriodaphnia dubia | 1 | 1 | 0 | ||
| Phosphate, ortho, dissolved [as P] | 2 | 0 | 0 | ||
| Solids, suspended percent removal | 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 MA0100013.
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 MA0100013 there.
Nearby on the register
- Discharge permits in Ayer
- Every permit record in Ayer, 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.