Clean Water Act discharge permit · NPDES NH0100625

LEAVITT E. MAGRATH WASTEWATER TREATMENT PLAN, Hampton, NH: NPDES NH0100625 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MajorDischarger class
22Pollutants under a numeric limit
15Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

LEAVITT E. MAGRATH WASTEWATER TREATMENT PLAN, held by HAMPTON W W T P, holds NPDES permit NH0100625, which discharges to Tide Mill Creek Via Tributary. EPA’s file records it issued August 28, 2007 and expiring August 31, 2012.

LEAVITT E. MAGRATH WASTEWATER TREATMENT PLAN, Hampton, New Hampshire: Individual permit NH0100625, held by HAMPTON W W T P; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued August 28, 2007, term to August 31, 2012; discharges to TIDE MILL CREEK VIA TRIBUTARY.

Solids, total suspended: 7 limits, 98 violations of any kind, 41 effluent exceedances, latest April 30, 2024, largest 858% over the limit.
Copper, total [as Cu]: 0 limits, 144 violations of any kind, 34 effluent exceedances, latest July 31, 2026, largest 284% over the limit.
Copper, total recoverable: 4 limits, 51 violations of any kind, 29 effluent exceedances, latest October 31, 2005, largest 376% over the limit.
pH: 2 limits, 29 violations of any kind, 27 effluent exceedances, latest March 31, 2026.
Nitrogen, ammonia total [as N]: 5 limits, 31 violations of any kind, 20 effluent exceedances, latest April 30, 2023, largest 632% over the limit.
Chlorine, total residual: 2 limits, 22 violations of any kind, 20 effluent exceedances, latest December 31, 2022, largest 7,977% over the limit.
Noel Statre 7Day Chronic Arbacia: 1 limit, 14 violations of any kind, 13 effluent exceedances, latest March 31, 2023, largest 94% over the limit.
Enterococci: 0 limits, 10 violations of any kind, 10 effluent exceedances, latest July 31, 2026, largest 426% over the limit.
BOD, 5-day, 20 deg. C: 7 limits, 51 violations of any kind, 9 effluent exceedances, latest August 31, 2010, largest 82% over the limit.
Noel Statre 7Day Chronic Menidia: 1 limit, 8 violations of any kind, 7 effluent exceedances, latest September 30, 2017, largest 94% over the limit.
Coliform, fecal general: 2 limits, 24 violations of any kind, 5 effluent exceedances, latest November 30, 2005, largest 99,999% over the limit.
Coliform, total general: 0 limits, 4 violations of any kind, 4 effluent exceedances, latest December 31, 2001, largest 703% over the limit.
Flow, in conduit or thru treatment plant: 2 limits, 4 violations of any kind, 2 effluent exceedances, latest April 30, 2010, largest 37% over the limit.
Coliform, fecal - % samples exceeding limit: 1 limit, 4 violations of any kind, 1 effluent exceedance, latest March 31, 2018, largest 30% over the limit.
LC50 Static 48Hr Acute Menidia: 1 limit, 2 violations of any kind, 1 effluent exceedance, latest September 30, 2003, largest 35% over the limit.
E. coli, thermotol, MF, MTEC: 2 limits, 11 violations of any kind, 0 effluent exceedances.
Cadmium, total recoverable: 1 limit, 4 violations of any kind, 0 effluent exceedances.
Lead, total recoverable: 1 limit, 4 violations of any kind, 0 effluent exceedances.
Chromium, total recoverable: 1 limit, 4 violations of any kind, 0 effluent exceedances.
Nickel, total recoverable: 1 limit, 3 violations of any kind, 0 effluent exceedances.
BOD, 5-day, percent removal: 1 limit, 3 violations of any kind, 0 effluent exceedances.
Aluminum, total recoverable: 1 limit, 2 violations of any kind, 0 effluent exceedances.
Zinc, total recoverable: 1 limit, 1 violation of any kind, 0 effluent exceedances.
Solids, suspended percent removal: 1 limit, 1 violation of any kind, 0 effluent exceedances.
LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia): 1 limit, 1 violation of any kind, 0 effluent exceedances.

June 20, 2026: Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environment (EP6).
March 13, 2026: Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environment (EP6).
February 15, 2025: Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environment (EP6).
January 14, 2024: Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment (EP6).
July 18, 2023: Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment (EP6).
April 24, 2019: Reporting Violations - Improper/ Incorrect Reporting (ST6).

New Hampshire holds 48 Publicly owned treatment works coverages of this permit type in EPA’s file; 29 were issued before NH0100625. HAMPTON W W T P holds 2 permits in New Hampshire.

Other permits held by HAMPTON W W T P

HAMPTON W W T P, Hampton: NHL100625, issued January 1, 2021

Coverages issued nearest NH0100625

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 24, 2007: KEENE WASTEWATER TREATMENT FACILITY, Swanzey, NH0100790, held by KEENE CITY OF
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
September 25, 2008: MANCHESTER CITY OF, Manchester, NH0100447

LEAVITT E. MAGRATH WASTEWATER TREATMENT PLAN among its neighbors

EPA’s permit file holds 30 discharge permits in the Hampton Harbor subwatershed (HUC 010600031005), NH0100625 among them. Its county holds 154, 10 of them major permits; NH0100625 is a major permit.

Other permits in the Hampton Harbor subwatershed (HUC 010600031005)

207 BEACH ROAD, Salisbury: MAR10042C, minor permit, permit term to February 16, 2027
9 GERRISH ROAD, Salisbury: MAR10042P, minor permit, permit term to February 16, 2027
ABF FREIGHT SYSTEM, INC., Salisbury: MANOEJ03S, minor permit, permit term to March 10, 2025
ANDOVER HEALTHCARE, INC., Salisbury: MANOEJ069, minor permit, permit term to February 19, 2026
AQUARION WATER COMPANY - BONNIE LANE - HAMPTON NH, Hampton: 01R10I064, minor permit, permit term to February 16, 2027
BJ'S WHOLESALE CLUB, Seabrook: NHR1001J0, minor permit, permit term to February 16, 2027
BRAZONICS, INC., Hampton: NHNOEJ01S, minor permit, permit term to April 23, 2026
C & J BUS LINES PARKING EXPANSION, Seabrook: NHR1002BM, minor permit, permit term to February 16, 2027
CHICK-FIL-A - SEABROOK, NH, Seabrook: NHR100288, minor permit, permit term to February 16, 2027
COASTAL RIDGE, North Hampton: NHR10025U, minor permit, permit term to February 16, 2027

Identity

Facility as filed	LEAVITT E. MAGRATH WASTEWATER TREATMENT PLAN
Permittee as filed	HAMPTON W W T P
NPDES ID	NH0100625
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 28, 2007
Expiration date	August 31, 2012
Address	Hampton, NH 03842
Receiving water	TIDE MILL CREEK VIA TRIBUTARY
Receiving water impaired	303(D) Listed
Subwatershed	Hampton Harbor (HUC 010600031005)

Effluent limits and exceedances

25Pollutants on file
22Under a numeric limit
25With a violation of any kind
15With 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
Solids, total suspended	7	98	41	April 30, 2024	858% over the limit
Copper, total [as Cu]	0	144	34	July 31, 2026	284% over the limit
Copper, total recoverable	4	51	29	October 31, 2005	376% over the limit
pH	2	29	27	March 31, 2026
Nitrogen, ammonia total [as N]	5	31	20	April 30, 2023	632% over the limit
Chlorine, total residual	2	22	20	December 31, 2022	7,977% over the limit
Noel Statre 7Day Chronic Arbacia	1	14	13	March 31, 2023	94% over the limit
Enterococci	0	10	10	July 31, 2026	426% over the limit
BOD, 5-day, 20 deg. C	7	51	9	August 31, 2010	82% over the limit
Noel Statre 7Day Chronic Menidia	1	8	7	September 30, 2017	94% over the limit
Coliform, fecal general	2	24	5	November 30, 2005	99,999% over the limit
Coliform, total general	0	4	4	December 31, 2001	703% over the limit
Flow, in conduit or thru treatment plant	2	4	2	April 30, 2010	37% over the limit
Coliform, fecal - % samples exceeding limit	1	4	1	March 31, 2018	30% over the limit
LC50 Static 48Hr Acute Menidia	1	2	1	September 30, 2003	35% over the limit
E. coli, thermotol, MF, MTEC	2	11	0
Cadmium, total recoverable	1	4	0
Lead, total recoverable	1	4	0
Chromium, total recoverable	1	4	0
Nickel, total recoverable	1	3	0
BOD, 5-day, percent removal	1	3	0
Aluminum, total recoverable	1	2	0
Zinc, total recoverable	1	1	0
Solids, suspended percent removal	1	1	0
LC50 Static 48Hr Acute Americamysis bahia (formerly Mysidopsis bahia)	1	1	0

Inspections, violations and enforcement

6Single-event violations

Date	What EPA recorded	Agency
June 20, 2026	Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environment	EP6
March 13, 2026	Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environment	EP6
February 15, 2025	Dry-weather SSO discharge to waters of the U.S. that may endanger health or the environment	EP6
January 14, 2024	Wet-weather SSO discharge to waters of the U.S. that may endanger health or the environment	EP6
July 18, 2023	Dry-weather SSO, no discharge to waters of the U.S., that may endanger health or the environment	EP6
April 24, 2019	Reporting Violations - Improper/ Incorrect Reporting	ST6

Inspections

EPA’s inspection file holds no inspection for NPDES NH0100625.

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 NH0100625.

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

The page covers NPDES permit NH0100625 for the Leavitt E. Magrath Wastewater Treatment Plant in Hampton, NH, held by Hampton W W T P, a major discharger listed as administratively continued. It records 22 major discharger class items, 15 pollutants under a numeric limit, and 15 pollutants with an effluent exceedance, with the permit's receiving water as Tide Mill Creek Via Tributary in the Hampton Harbor subwatershed (HUC 010600031005).