Clean Water Act discharge permit · NPDES WA0020168

ZILLAH POTW, Zillah, WA: NPDES WA0020168 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
16Pollutants under a numeric limit
2Pollutants with an effluent exceedance

ZILLAH POTW, held by City of Zillah, holds NPDES permit WA0020168. EPA’s file records it issued September 26, 2017 and expiring October 31, 2022. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	ZILLAH POTW
Permittee as filed	City of Zillah
NPDES ID	WA0020168
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	September 26, 2017
Expiration date	October 31, 2022
Issuing agency	State
Address	Zillah, WA 98953
Subwatershed	Town of Zillah-Yakima River (HUC 170300030503)
Program components on file	POTW, Pretreatment
SIC	4952 – Sewerage Systems

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.

Effluent limits and exceedances

16Pollutants on file
16Under a numeric limit
9With a violation of any kind
2With 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	6	35	5	March 31, 2011	33% over the limit
Flow	2	12	2	June 30, 2009	2,029% over the limit
BOD, 5-day, 20 deg. C	6	30	0
Nitrogen, ammonia total [as N]	4	30	0
Temperature, water deg. centigrade	2	10	0
Oxygen, dissolved [DO]	2	10	0
pH	2	10	0
Coliform, fecal general	2	10	0
BOD, percent removal [total]	1	2	0
Oil and grease, hexane extr method	1	0	0
Nitrogen, Kjeldahl, total [as N]	1	0	0
Nitrite + Nitrate total [as N]	1	0	0
Phosphorus, total [as P]	1	0	0
Hardness, total [as CaCO3]	1	0	0
Solids, total dissolved	1	0	0
Solids, suspended percent removal	1	0	0

Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.

Inspections, violations and enforcement

0Single-event violations

EPA’s single-event violation file, as loaded, holds no violation for NPDES WA0020168.

Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.

Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.

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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID WA0020168 there.

Nearby on the register

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

This public-records page covers the Clean Water Act discharge permit NPDES WA0020168 for ZILLAH POTW in Zillah, WA, held by City of Zillah, which is listed as administratively continued and a minor discharger, with an issuance date of September 26, 2017 and an expiration date of October 31, 2022. The page lists 16 pollutants on file, 2 pollutants under a numeric limit, and 2 pollutants with an effluent exceedance, with the facility sitting in the Town of Zillah-Yakima River subwatershed (HUC 170300030503).