Clean Water Act discharge permit · NPDES NH0100129
HOOKSETT WASTEWATER TREATMENT FACILITY, Hooksett, NH: NPDES NH0100129 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 19Pollutants under a numeric limit
- 8Pollutants with an effluent exceedance
HOOKSETT WASTEWATER TREATMENT FACILITY, held by HOOKSETT W W T F, holds NPDES permit NH0100129, which discharges to Merrimack River. EPA’s file records it issued September 6, 2007 and expiring August 31, 2012. 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 | HOOKSETT WASTEWATER TREATMENT FACILITY |
|---|---|
| Permittee as filed | HOOKSETT W W T F |
| NPDES ID | NH0100129 |
| 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 | September 6, 2007 |
| Expiration date | August 31, 2012 |
| Address | Hooksett, NH 03106 |
| Receiving water | MERRIMACK RIVER |
| Subwatershed | Browns Brook-Merrimack River (HUC 010700060802) |
| Program components on file | Biosolids, POTW, Pretreatment |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
| Other EPA IDs (FRS) | ICIS-AIR source NH0000003301390546 |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download; cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 22Pollutants on file
- 19Under a numeric limit
- 12With a violation of any kind
- 8With 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 | 86 | 81 | July 31, 2023 | 380% over the limit |
| E. coli, thermotol, MF, MTEC | 2 | 21 | 21 | September 30, 2013 | 99,999% over the limit |
| Solids, total suspended | 7 | 20 | 20 | July 31, 2023 | 172% over the limit |
| pH | 2 | 19 | 19 | June 30, 2018 | |
| E. coli, colony forming units [CFU] | 0 | 17 | 17 | March 31, 2025 | 99,999% over the limit |
| Chlorine, total residual | 2 | 13 | 12 | July 31, 2022 | 63% over the limit |
| BOD, 5-day, percent removal | 1 | 8 | 8 | March 31, 2023 | 93% over the limit |
| Solids, suspended percent removal | 1 | 2 | 2 | March 31, 2023 | 133% over the limit |
| Arsenic, total recoverable | 0 | 2 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 1 | 0 | ||
| Aluminum, total recoverable | 1 | 1 | 0 | ||
| Phosphorus, total [as P] | 0 | 1 | 0 | ||
| Nitrogen, ammonia total [as N] | 1 | 0 | 0 | ||
| Hardness, total [as CaCO3] | 1 | 0 | 0 | ||
| Nickel, total recoverable | 1 | 0 | 0 | ||
| Zinc, total recoverable | 1 | 0 | 0 | ||
| Cadmium, total recoverable | 1 | 0 | 0 | ||
| Lead, total recoverable | 1 | 0 | 0 | ||
| Chromium, total recoverable | 1 | 0 | 0 | ||
| Copper, total recoverable | 1 | 0 | 0 | ||
| LC50 Static 48Hr Acute Ceriodaphnia dubia | 1 | 0 | 0 | ||
| LC50 Static 48Hr Acute Pimephales promelas | 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
- 5Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| January 25, 2024 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| December 18, 2023 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | EP6 |
| July 16, 2023 | Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment | EP6 |
| May 5, 2022 | Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment | EP6 |
| February 13, 2020 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
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, NH0100129.
Start the watch
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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 NH0100129 there.
Nearby on the register
- Discharge permits in Hooksett
- Every permit record in Hooksett, A to Z
- Discharge permits in New Hampshire
- Every permit record in New Hampshire, A to Z
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.