Clean Water Act discharge permit · NPDES NHG580018
HENNIKER WASTEWATER TREATMENT FACILITY, Henniker, NH: NPDES NHG580018 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 28Pollutants under a numeric limit
- 3Pollutants with an effluent exceedance
HENNIKER WASTEWATER TREATMENT FACILITY, held by HENNIKER W W T F, holds NPDES permit NHG580018, which discharges to Contoocook River. EPA’s file records it issued December 1, 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 | HENNIKER WASTEWATER TREATMENT FACILITY |
|---|---|
| Permittee as filed | HENNIKER W W T F |
| NPDES ID | NHG580018 |
| Permit status | Effective |
| Permit type | Coverage under a general permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | December 1, 2021 |
| Expiration date | November 30, 2026 |
| Address | Henniker, NH 03242 |
| Receiving water | CONTOOCOOK RIVER |
| Subwatershed | Hopkinton Lake-Contoocook River (HUC 010700030303) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 28Pollutants on file
- 28Under a numeric limit
- 6With a violation of any kind
- 3With 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] | 6 | 36 | 24 | July 31, 2026 | 815% over the limit |
| Phosphorus, total [as P] | 2 | 11 | 9 | July 31, 2026 | 1,209% over the limit |
| E. coli | 2 | 1 | 1 | May 31, 2026 | 1% over the limit |
| Nitrogen, total [as N] | 4 | 20 | 0 | ||
| Flow, in conduit or thru treatment plant | 3 | 6 | 0 | ||
| BOD, 5-day, 20 deg. C | 7 | 1 | 0 | ||
| Solids, total suspended | 7 | 0 | 0 | ||
| pH | 3 | 0 | 0 | ||
| Perfluorooctanoic acid (PFOA) | 3 | 0 | 0 | ||
| Perfluorononanoic acid (PFNA) | 3 | 0 | 0 | ||
| Perfluorohexanesulfonic acid (PFHxS) | 3 | 0 | 0 | ||
| Perfluorooctanesulfonic acid (PFOS) | 3 | 0 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 0 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 0 | 0 | ||
| Nitrite + Nitrate total [as N] | 2 | 0 | 0 | ||
| Carbon, tot organic [TOC] | 2 | 0 | 0 | ||
| Hardness, total [as CaCO3] | 2 | 0 | 0 | ||
| Cadmium, total [as Cd] | 2 | 0 | 0 | ||
| Lead, total [as Pb] | 2 | 0 | 0 | ||
| Nickel, total [as Ni] | 2 | 0 | 0 | ||
| Zinc, total [as Zn] | 2 | 0 | 0 | ||
| Aluminum, total [as Al] | 2 | 0 | 0 | ||
| Temperature, water deg. centigrade | 1 | 0 | 0 | ||
| Carbon, dissolved organic [as C] | 1 | 0 | 0 | ||
| BOD, 5-day, percent removal | 1 | 0 | 0 | ||
| Solids, suspended percent removal | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES NHG580018.
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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Start the watch
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- One state — $4,990/year
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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 NHG580018 there.
Nearby on the register
- Discharge permits in Henniker
- Every permit record in Henniker, 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 September 15, 2026.