NPDES WA0020940 · Clean Water Act

OMAK POTW, Omak, WA: NPDES WA0020940 discharge permit, effluent exceedances, inspections, penalties

OMAK POTW, Omak, Washington: Individual permit WA0020940, held by City of Omak; Publicly owned treatment works; Administratively continued; issued December 27, 2015, term to December 31, 2020, by State; Sewage Treatment Facilities.

BOD, percent removal [total]: 0 limits, 24 violations of any kind.

May 19, 2026: Evaluation (S).

Washington holds 238 Publicly owned treatment works coverages of this permit type in EPA’s file; 130 were issued before WA0020940. City of Omak holds 2 permits in Washington.

Other permits held by City of Omak

OMAK SEWER SYSTEM IMPROVEMENTS, Omak: WAR125546, issued 2020-11-18

Coverages issued nearest WA0020940

2015-11-13: PORT TOWNSEND STP, Port Townsend: WA0037052, held by City of Port Townsend
2015-11-17: ROCHE HARBOR RESORT WWTP, Friday Harbor: WA0021822, held by Roche Harbor Utilities
2015-11-30: TAYLOR BAY STP, Longbranch: WA0037656, held by Taylor Bay Beach Club Inc.
2015-12-11: EASTSOUND ORCAS VILLAGE WWTP, Orcas: WA0030911, held by EASTSOUND SEWER & WATER DISTRICT
2015-12-18: LA CENTER STP, La Center: WA0023230, held by City of La Center
2016-01-07: PORT ANGELES STP, Port Angeles: WA0023973, held by City of Port Angeles
2016-01-12: BREWSTER POTW, Brewster: WA0021008, held by City of Brewster
2016-01-26: ROSALIA STP, Rosalia: WA0044687, held by Town of Rosalia
2016-03-14: ASOTIN COUNTY PUD, Clarkston: WA0021113, held by City of Clarkston
2016-03-30: SEATTLE CSO, Seattle: WA0031682, held by CITY OF SEATTLE PUBLIC UTILITIES

OMAK POTW among its neighbors

12 discharge permits are in the Swipkin Canyon-Okanogan River subwatershed (HUC 170200060411); WA0020940 is one. Its county: 57, 0 major; WA0020940 is minor permit.

Other permits in the Swipkin Canyon-Okanogan River subwatershed (HUC 170200060411)

CHIEF JOSEPH FISH HATCHERY - OMAK, Omak: WAG130024, minor, term to 2021-07-31
FREELS SAND & GRAVEL LLC, Omak: WAG505199, minor, term to 2026-03-31
GRANITE CONSTRUCTION ENGH ROAD, Omak: WAG505204, minor, term to 2026-03-31
JULIA MALEY PARK WELL DRILLING, Omak: WAR302394, minor, term to 2015-12-31
OKANOGAN COUNTY COURTHOUSE, Okanogan: WAR302299, minor, term to 2015-12-31
OKANOGAN IRRIGATION DISTRICT, Okanogan: WAG994269, minor, term to 2017-06-14
OKANOGAN VALLEY CONCRETE INC, Okanogan: WAG505021, minor, term to 2026-03-31
OMAK POTW, Omak: WAL020940, minor, term to 2025-12-31
OMAK SEWER SYSTEM IMPROVEMENTS, Omak: WAR125546, minor, term to 2025-12-31
UNITED PARCEL SERVICE, INC., East Omak: WANOEIA00, minor, term to 2027-02-17

Identity

Facility	OMAK POTW
Permittee	City of Omak
NPDES ID	WA0020940
Status	Administratively continued
Type	Individual permit
Class	Minor
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	December 27, 2015
Expires	December 31, 2020
Agency	State
Address	Omak, WA 98841
Receiving water impaired	303(D) Listed
Subwatershed	Swipkin Canyon-Okanogan River (HUC 170200060411)
Program components on file	POTW, Pretreatment
NAICS	221320 – Sewage Treatment Facilities
SIC	4952 – Sewerage Systems
Other EPA IDs (FRS)	RCRA handler WAD097254569

NPDES WA0020940: effluent limits and exceedances

OMAK POTW (NPDES WA0020940): 1 pollutants on file, 0 limited; 1 with a violation of any kind, 0 with an exceedance.

How exceedances are counted.

Pollutant	Limits	Violations	Exceedances	Latest	Largest, as filed
BOD, percent removal [total]	0	24	0

NPDES WA0020940: inspections, violations and enforcement

NPDES WA0020940: 1 inspection

Date	What EPA recorded	Agency
May 19, 2026	Evaluation	S

NPDES WA0020940 (OMAK POTW): no single-event violation, formal enforcement action and informal enforcement action on file.

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NPDES WA0020940: one email when its EPA record changes — $99/month.

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Permits near NPDES WA0020940

NPDES WA0020940: 1 pollutant rows, 1 dated events; ICIS-NPDES download, loaded October 14, 2026.