Clean Water Act discharge permit · NPDES NH0100382

HINSDALE WWTP, Hinsdale, NH: NPDES NH0100382 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
20Pollutants under a numeric limit
6Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

HINSDALE WWTP, held by HINSDALE TOWN OF, holds NPDES permit NH0100382, which discharges to Ashuelot River. EPA’s file records it issued September 28, 2007 and expiring November 30, 2012.

HINSDALE WWTP, Hinsdale, New Hampshire: Individual permit NH0100382, held by HINSDALE TOWN OF; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued September 28, 2007, term to November 30, 2012; discharges to ASHUELOT RIVER.

BOD, 5-day, 20 deg. C: 7 limits, 38 violations of any kind, 29 effluent exceedances, latest June 30, 2011, largest 81% over the limit.
BOD, 5-day, percent removal: 1 limit, 25 violations of any kind, 22 effluent exceedances, latest February 29, 2020, largest 157% over the limit.
Solids, suspended percent removal: 1 limit, 13 violations of any kind, 13 effluent exceedances, latest March 31, 2011, largest 175% over the limit.
Solids, total suspended: 7 limits, 10 violations of any kind, 9 effluent exceedances, latest March 31, 2008, largest 187% over the limit.
E. coli, thermotol, MF, MTEC: 2 limits, 8 violations of any kind, 6 effluent exceedances, latest December 31, 2020, largest 99,999% over the limit.
pH: 2 limits, 1 violation of any kind, 1 effluent exceedance, latest November 30, 2002.
Nitrogen, total [as N]: 0 limits, 4 violations of any kind, 0 effluent exceedances.
Flow, in conduit or thru treatment plant: 2 limits, 2 violations of any kind, 0 effluent exceedances.
Nitrogen, ammonia total [as N]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Phosphorus, total [as P]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Hardness, total [as CaCO3]: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Nickel, total recoverable: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Zinc, total recoverable: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Aluminum, total recoverable: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Cadmium, total recoverable: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Lead, total recoverable: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Chromium, total recoverable: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Copper, total recoverable: 1 limit, 0 violations of any kind, 0 effluent exceedances.
Chlorine, total residual: 1 limit, 0 violations of any kind, 0 effluent exceedances.
LC50 Static 48Hr Acute Ceriodaphnia dubia: 1 limit, 0 violations of any kind, 0 effluent exceedances.
LC50 Static 48Hr Acute Pimephales promelas: 1 limit, 0 violations of any kind, 0 effluent exceedances.

New Hampshire holds 48 Publicly owned treatment works coverages of this permit type in EPA’s file; 32 were issued before NH0100382. HINSDALE TOWN OF holds 2 permits in New Hampshire.

Other permits held by HINSDALE TOWN OF

HINSDALE TOWN OF, Hinsdale: NHL100382, issued January 1, 2021

Coverages issued nearest NH0100382

May 1, 2007: HILLSBOROUGH WWTF, Hillsborough, NH0100111, held by HILLSBOROUGH MTP
August 24, 2007: KEENE WASTEWATER TREATMENT FACILITY, Swanzey, NH0100790, held by KEENE CITY OF
August 28, 2007: LEAVITT E. MAGRATH WASTEWATER TREATMENT PLAN, Hampton, NH0100625, held by HAMPTON W W T P
September 6, 2007: HOOKSETT WASTEWATER TREATMENT FACILITY, Hooksett, NH0100129, held by HOOKSETT W W T F
September 25, 2007: MERRIMACK WASTE WATER TREATMENT PLANT, Merrimack, NH0100161, held by MERRIMACK W W T F
October 30, 2007: WALLIS SANDS STATE PARK, Rye, NH0020966
September 25, 2008: MANCHESTER CITY OF, Manchester, NH0100447
November 5, 2008: LANCASTER LAGOON W W T F, Lancaster, NH0100145, held by LANCASTER W W T F
September 2, 2009: LITTLETON TOWN OF, Littleton, NH0100153
June 1, 2010: STAR ISLAND WASTEWATER TREATMENT FACILITY, Rye, NH0101028, held by STAR ISLAND TREATMENT FACILITY

HINSDALE WWTP among its neighbors

EPA’s permit file holds 4 discharge permits in the Ashuelot River subwatershed (HUC 010802010403), NH0100382 among them. Its county holds 45, 2 of them major permits; NH0100382 is a major permit.

Other permits in the Ashuelot River subwatershed (HUC 010802010403)

HINSDALE TOWN OF, Hinsdale: NHL100382, minor permit, permit term to December 31, 2025
HINSDALE WWTP, Hinsdale: NHG580016, minor permit, discharging to ASHUELOT RIVER, permit term to November 30, 2026
WINCHESTER WASTEWATER TREATMENT PLANT - DEWATERING, Winchester: NHG070040, minor permit, discharging to Ashuelot River, permit term to September 30, 2013

Identity

Facility as filed	HINSDALE WWTP
Permittee as filed	HINSDALE TOWN OF
NPDES ID	NH0100382
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 28, 2007
Expiration date	November 30, 2012
Address	Hinsdale, NH 03451
Receiving water	ASHUELOT RIVER
Receiving water impaired	303(D) Listed
Subwatershed	Ashuelot River (HUC 010802010403)

Effluent limits and exceedances

21Pollutants on file
20Under a numeric limit
8With a violation of any kind
6With 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	38	29	June 30, 2011	81% over the limit
BOD, 5-day, percent removal	1	25	22	February 29, 2020	157% over the limit
Solids, suspended percent removal	1	13	13	March 31, 2011	175% over the limit
Solids, total suspended	7	10	9	March 31, 2008	187% over the limit
E. coli, thermotol, MF, MTEC	2	8	6	December 31, 2020	99,999% over the limit
pH	2	1	1	November 30, 2002
Nitrogen, total [as N]	0	4	0
Flow, in conduit or thru treatment plant	2	2	0
Nitrogen, ammonia total [as N]	1	0	0
Phosphorus, total [as P]	1	0	0
Hardness, total [as CaCO3]	1	0	0
Nickel, total recoverable	1	0	0
Zinc, total recoverable	1	0	0
Aluminum, 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
Chlorine, total residual	1	0	0
LC50 Static 48Hr Acute Ceriodaphnia dubia	1	0	0
LC50 Static 48Hr Acute Pimephales promelas	1	0	0

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES NH0100382.

Inspections

EPA’s inspection file holds no inspection for NPDES NH0100382.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES NH0100382.

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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.

This public-records page covers Clean Water Act discharge permit NPDES NH0100382 for the HINSDALE WWTP in Hinsdale, NH, held by HINSDALE TOWN OF and discharging to the ASHUELOT RIVER within the Ashuelot River subwatershed (HUC 010802010403). The permit is listed as administratively continued, with a Major discharger class, 20 pollutants under a numeric limit, and 6 pollutants with an effluent exceedance.