Clean Water Act discharge permit · NPDES WAR046509

WALLA WALLA COUNTY, Walla Walla, WA: NPDES WAR046509 discharge permit, effluent exceedances, inspections, penalties

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

WALLA WALLA COUNTY, held by Walla Walla County, holds NPDES permit WAR046509. EPA’s file records it issued July 1, 2019 and expiring July 31, 2024.

WALLA WALLA COUNTY, Walla Walla, Washington: Coverage under a general permit WAR046509, held by Walla Walla County; Small municipal storm sewer systems; Administratively continued (past its expiration date and still in force until reissued); issued July 1, 2019, term to July 31, 2024, by State.

Washington holds 153 Small municipal storm sewer systems coverages of this permit type in EPA’s file; 2 were issued before WAR046509. Walla Walla County holds 4 permits in Washington.

Other permits held by Walla Walla County

PETTYJOHN BRIDGE, Prescott: WAR313223, issued November 18, 2020
SEVEN MILE BRIDGE, Walla Walla: WAR314698, issued November 18, 2020
WALLULA BRIDGE, Walla Walla: WAR315744, issued November 19, 2025

Coverages issued nearest WAR046509

July 1, 2019: PULLMAN CITY, Pullman, WAR046504, held by City of Pullman
July 1, 2019: SPOKANE CITY, Spokane, WAR046505, held by City of Spokane
July 1, 2019: SPOKANE COUNTY, Spokane, WAR046506, held by Spokane County
July 1, 2019: SPOKANE VALLEY CITY, Spokane Valley, WAR046507, held by City of Spokane Valley
July 1, 2019: WALLA WALLA CITY, Walla Walla, WAR046508, held by City Of Walla Walla
July 1, 2019: MOSES LAKE CITY, Moses Lake, WAR046510, held by City of Moses Lake
July 1, 2019: WASHINGTON STATE UNIVERSITY PULLMAN, Pullman, WAR046700, held by Washington State University - Pullman
July 1, 2019: WASHINGTON STATE UNIVERSITY SPOKANE, Spokane, WAR046701, held by Washington State University Health Sciences Spokan
July 1, 2019: WENATCHEE VALLEY COLLEGE, Wenatchee, WAR303571, held by Wenatchee Valley College
July 1, 2019: COLLEGE PLACE CITY, College Place, WAR308236, held by City of College Place

WALLA WALLA COUNTY among its neighbors

EPA’s permit file holds 32 discharge permits in the Lower Mill Creek subwatershed (HUC 170701020204), WAR046509 among them. Its county holds 42, 1 of them major permits; WAR046509 is a minor permit.

Other permits in the Lower Mill Creek subwatershed (HUC 170701020204)

106 STRAWBERRY LANE, Walla Walla: WAR314931, minor permit, permit term to December 31, 2025
2015 ROSE ST TBD, Walla Walla: WAR302821, minor permit, permit term to December 31, 2015
ABADIE STREET MINI STORAGE, Walla Walla: WAR010616, minor permit, permit term to December 31, 2025
BYRNES OIL COMPANY INC, Walla Walla: WAR000011, minor permit, permit term to December 31, 2024
COLLEGE CREEK VILLAGE, Walla Walla: WAR313206, minor permit, permit term to December 31, 2025
HARVEY RANCH ESTATES, Walla Walla: WAR311128, minor permit, permit term to December 31, 2025
HEADQUARTERS BUILDING LANDSCAPING MODIFICATION, Walla Walla: WAR10F06H, minor permit, permit term to February 15, 2022
HERITAGE ROAD ACCESS PROJECT, Walla Walla: WAR302482, minor permit, permit term to December 31, 2015
HOBSON DIVISON MADISON WATER MAIN REPLACEMENT, Walla Walla: WAR315243, minor permit, permit term to December 31, 2030
INTERSTATE CONCRETE WALLA WALLA BATCH PLANT, Walla Walla: WAG507164, minor permit, permit term to March 31, 2026

What the register holds for WALLA WALLA COUNTY: its NPDES ID, its permit type and status, its dates, its address in Walla Walla, Washington. EPA’s effluent violation file and its single-event violation file hold no violation for NPDES WAR046509.

Identity

Facility as filed	WALLA WALLA COUNTY
Permittee as filed	Walla Walla County
NPDES ID	WAR046509
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Program	Small municipal storm sewer systems
Issued	July 1, 2019
Expiration date	July 31, 2024
Issuing agency	State
Address	Walla Walla, WA 99362
Receiving water impaired	303(D) Listed
Subwatershed	Lower Mill Creek (HUC 170701020204)

Effluent limits and exceedances

0Pollutants on file
0Under a numeric limit
0With a violation of any kind
0With an effluent exceedance

EPA’s limits and effluent violation files hold no pollutant row for NPDES WAR046509.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES WAR046509.

Inspections

EPA’s inspection file holds no inspection for NPDES WAR046509.

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 WAR046509.

Watch this permit

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Nearby on the register

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

The Walla Walla County Storm Water Small MS4s permit, NPDES ID WAR046509, is one of 2 Storm Water Small MS4s permits on EPA's NPDES register in Walla Walla County, including this one. It also sits among 32 NPDES permits in the Lower Mill Creek subwatershed, counting this one. The permit lists no pollutants under a numeric limit and no pollutants with an effluent exceedance.