Clean Water Act discharge permit · NPDES NH0100790

KEENE WASTEWATER TREATMENT FACILITY, Swanzey, NH: NPDES NH0100790 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
23Pollutants under a numeric limit
19Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

KEENE WASTEWATER TREATMENT FACILITY, held by KEENE CITY OF, holds NPDES permit NH0100790, which discharges to Ashuelot River. EPA’s file records it issued August 24, 2007 and expiring August 31, 2012.

KEENE WASTEWATER TREATMENT FACILITY, Swanzey, New Hampshire: Individual permit NH0100790, held by KEENE CITY OF; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued August 24, 2007, term to August 31, 2012; discharges to ASHUELOT RIVER.

Copper, total [as Cu]: 0 limits, 202 violations of any kind, 196 effluent exceedances, latest September 30, 2005, largest 912% over the limit.
Lead, total [as Pb]: 4 limits, 108 violations of any kind, 104 effluent exceedances, latest January 31, 2004, largest 4,270% over the limit.
E. coli, thermotol, MF, MTEC: 2 limits, 86 violations of any kind, 78 effluent exceedances, latest September 30, 2015, largest 99,999% over the limit.
Zinc, total [as Zn]: 4 limits, 72 violations of any kind, 67 effluent exceedances, latest January 31, 2013, largest 74% over the limit.
Copper, total recoverable: 4 limits, 58 violations of any kind, 57 effluent exceedances, latest October 31, 2014, largest 239% over the limit.
Nitrogen, ammonia total [as N]: 7 limits, 71 violations of any kind, 50 effluent exceedances, latest October 31, 2017, largest 99,999% over the limit.
Solids, total suspended: 7 limits, 58 violations of any kind, 35 effluent exceedances, latest May 31, 2012, largest 99,999% over the limit.
pH: 2 limits, 28 violations of any kind, 24 effluent exceedances, latest January 31, 2026.
Solids, suspended percent removal: 1 limit, 25 violations of any kind, 21 effluent exceedances, latest October 31, 2007, largest 95% over the limit.
BOD, 5-day, percent removal: 1 limit, 25 violations of any kind, 20 effluent exceedances, latest October 31, 2007, largest 95% over the limit.
Phosphorus, total [as P]: 14 limits, 14 violations of any kind, 10 effluent exceedances, latest May 31, 2012, largest 1,115% over the limit.
BOD, carbonaceous [5 day, 20 C]: 7 limits, 38 violations of any kind, 7 effluent exceedances, latest October 31, 2005, largest 99,999% over the limit.
Oxygen, dissolved [DO]: 1 limit, 10 violations of any kind, 7 effluent exceedances, latest April 30, 2007, largest 44% over the limit.
Aluminum, total recoverable: 2 limits, 8 violations of any kind, 5 effluent exceedances, latest January 31, 2026, largest 63% over the limit.
NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia: 1 limit, 10 violations of any kind, 4 effluent exceedances, latest September 30, 2007, largest 87% over the limit.
LC50 Static 48Hr Acute Ceriodaphnia dubia: 1 limit, 8 violations of any kind, 3 effluent exceedances, latest June 30, 2005, largest 88% over the limit.
Flow, in conduit or thru treatment plant: 2 limits, 4 violations of any kind, 2 effluent exceedances, latest October 31, 2005, largest 99,999% over the limit.
Noel Statre 7Day Chronic Pimephales: 1 limit, 5 violations of any kind, 1 effluent exceedance, latest March 31, 1996, largest 99,999% over the limit.
NOEL Static 7Day Chronic Ceriodaphnia dubia: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest September 30, 2024, largest 75% over the limit.
LC50 Static 48Hr Acute Pimephales promelas: 1 limit, 8 violations of any kind, 0 effluent exceedances.
BOD, 5-day, 20 deg. C: 0 limits, 4 violations of any kind, 0 effluent exceedances.
E. coli: 0 limits, 1 violation of any kind, 0 effluent exceedances.
Phosphate, ortho, dissolved [as P]: 2 limits, 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.
Cadmium, 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.

November 3, 2026: Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
August 12, 2026: Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
July 24, 2026: Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
November 4, 2025: Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
September 20, 2025: Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
December 16, 2024: Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
July 19, 2024: Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment (EP6).
June 17, 2024: Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
April 15, 2024: Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
June 8, 2023: Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).
March 20, 2023: Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment (EP6).
December 26, 2022: Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment (EP6).
October 31, 2022: Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment (EP6).

New Hampshire holds 48 Publicly owned treatment works coverages of this permit type in EPA’s file; 28 were issued before NH0100790. KEENE CITY OF holds 2 permits in New Hampshire.

Other permits held by KEENE CITY OF

KEENE CITY OF, Swanzey: NHL100790, issued January 1, 2021

Coverages issued nearest NH0100790

February 21, 2007: SUNAPEE W W T F, Sunapee, NH0100544
February 27, 2007: PETERBOROUGH WASTEWATER TREATMENT PLANT, Peterborough, NH0100650, held by PETERBOROUGH TOWN OF
April 10, 2007: PORTSMOUTH CITY OF, Portsmouth, NH0100234, held by PORTSMOUTH-PIERCE CITY OF
April 18, 2007: NEWPORT WASTEWATER TREATMENT FACILITY, Newport, NH0100200, held by NEWPORT TOWN OF
May 1, 2007: HILLSBOROUGH WWTF, Hillsborough, NH0100111, held by HILLSBOROUGH MTP
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
September 28, 2007: HINSDALE WWTP, Hinsdale, NH0100382, held by HINSDALE TOWN OF
October 30, 2007: WALLIS SANDS STATE PARK, Rye, NH0020966

KEENE WASTEWATER TREATMENT FACILITY among its neighbors

EPA’s permit file holds 21 discharge permits in the Ash Swamp Brook-Ashuelot River subwatershed (HUC 010802010301), NH0100790 among them. Its county holds 45, 2 of them major permits; NH0100790 is a major permit.

Other permits in the Ash Swamp Brook-Ashuelot River subwatershed (HUC 010802010301)

2021 D108 TRANSMISSION LINE STRUCTURE REPLACEMENT PROJECT, Keene: NHR1001B3, minor permit, permit term to February 15, 2022
2022 T198 TRANSMISSION LINE STRUCTURE REPLACEMENT PROJECT, Keene: NHR1001ET, minor permit, permit term to February 15, 2022
603 OPTX, LLC, Keene: NHNOEJ04V, minor permit, permit term to October 16, 2030
AMETEK PRECITECH, INC., Keene: NHNOEJ03X, minor permit, permit term to January 24, 2029
C&S AVIATION SERVICES, Keene: NHR053066, minor permit, permit term to June 3, 2020
CORNING NETOPTIX, INC, Keene: NHNOE3309, minor permit, permit term to August 24, 2026
EVERSOURCE NORTH KEENE SUBSTATION, Keene: NHR1001QK, minor permit, permit term to February 16, 2027
FAIRFIELD KIA OF KEENE, Keene: 01R10I05E, minor permit, permit term to February 16, 2027
G.S. PRECISION, Keene: NHNOEJ01J, minor permit, permit term to November 23, 2025
ICU MEDICAL - KEENE, Keene, Nh: NHNOEJ043, minor permit, permit term to July 2, 2029

Identity

Facility as filed	KEENE WASTEWATER TREATMENT FACILITY
Permittee as filed	KEENE CITY OF
NPDES ID	NH0100790
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	August 24, 2007
Expiration date	August 31, 2012
Address	Swanzey, NH 03431
Receiving water	ASHUELOT RIVER
Receiving water impaired	303(D) Listed
Subwatershed	Ash Swamp Brook-Ashuelot River (HUC 010802010301)
Program components on file	POTW, Pretreatment
SIC	4952 – Sewerage Systems

Effluent limits and exceedances

27Pollutants on file
23Under a numeric limit
22With a violation of any kind
19With 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]	0	202	196	September 30, 2005	912% over the limit
Lead, total [as Pb]	4	108	104	January 31, 2004	4,270% over the limit
E. coli, thermotol, MF, MTEC	2	86	78	September 30, 2015	99,999% over the limit
Zinc, total [as Zn]	4	72	67	January 31, 2013	74% over the limit
Copper, total recoverable	4	58	57	October 31, 2014	239% over the limit
Nitrogen, ammonia total [as N]	7	71	50	October 31, 2017	99,999% over the limit
Solids, total suspended	7	58	35	May 31, 2012	99,999% over the limit
pH	2	28	24	January 31, 2026
Solids, suspended percent removal	1	25	21	October 31, 2007	95% over the limit
BOD, 5-day, percent removal	1	25	20	October 31, 2007	95% over the limit
Phosphorus, total [as P]	14	14	10	May 31, 2012	1,115% over the limit
BOD, carbonaceous [5 day, 20 C]	7	38	7	October 31, 2005	99,999% over the limit
Oxygen, dissolved [DO]	1	10	7	April 30, 2007	44% over the limit
Aluminum, total recoverable	2	8	5	January 31, 2026	63% over the limit
NOEL Static Renewal 7Day Chronic Ceriodaphnia dubia	1	10	4	September 30, 2007	87% over the limit
LC50 Static 48Hr Acute Ceriodaphnia dubia	1	8	3	June 30, 2005	88% over the limit
Flow, in conduit or thru treatment plant	2	4	2	October 31, 2005	99,999% over the limit
Noel Statre 7Day Chronic Pimephales	1	5	1	March 31, 1996	99,999% over the limit
NOEL Static 7Day Chronic Ceriodaphnia dubia	0	1	1	September 30, 2024	75% over the limit
LC50 Static 48Hr Acute Pimephales promelas	1	8	0
BOD, 5-day, 20 deg. C	0	4	0
E. coli	0	1	0
Phosphate, ortho, dissolved [as P]	2	0	0
Hardness, total [as CaCO3]	1	0	0
Nickel, total recoverable	1	0	0
Cadmium, total recoverable	1	0	0
Chromium, total recoverable	1	0	0

Inspections, violations and enforcement

13Single-event violations

Date	What EPA recorded	Agency
November 3, 2026	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
August 12, 2026	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
July 24, 2026	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
November 4, 2025	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
September 20, 2025	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
December 16, 2024	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
July 19, 2024	Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment	EP6
June 17, 2024	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
April 15, 2024	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
June 8, 2023	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6
March 20, 2023	Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment	EP6
December 26, 2022	Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment	EP6
October 31, 2022	Dry-weather SSO, no discharge to waters of the U.S., not permit compliant, no endangerment	EP6

Inspections

EPA’s inspection file holds no inspection for NPDES NH0100790.

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 NH0100790.

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Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

This public-records page covers the Clean Water Act NPDES discharge permit NH0100790 for the KEENE WASTEWATER TREATMENT FACILITY in Swanzey, NH, held by KEENE CITY OF and discharging to the ASHUELOT RIVER, with its permit status listed as administratively continued. The page lists 23 as the discharger class and 19 as the number of pollutants under a numeric limit, along with 19 pollutants showing an effluent exceedance.