Clean Water Act discharge permit · NPDES WA0023396

MUKILTEO WATER AND WASTEWATER DISTRICT WWTP, Mukilteo, WA: NPDES WA0023396 discharge permit, effluent exceedances, inspections, penalties

EffectivePermit status
MinorDischarger class
0Pollutants under a numeric limit
3Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

MUKILTEO WATER AND WASTEWATER DISTRICT WWTP, held by MUKILTEO WATER & WASTEWATER DISTRICT, holds NPDES permit WA0023396. EPA’s file records it issued October 31, 2018 and expiring November 30, 2023. 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	MUKILTEO WATER AND WASTEWATER DISTRICT WWTP
Permittee as filed	MUKILTEO WATER & WASTEWATER DISTRICT
NPDES ID	WA0023396
Permit status	Effective
Permit type	Individual permit
Discharger class	Minor discharger
Facility type	Publicly owned treatment works
Program	Publicly owned treatment works
Issued	October 31, 2018
Expiration date	November 30, 2023
Issuing agency	State
Address	Mukilteo, WA 98275
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

8Pollutants on file
0Under a numeric limit
8With a violation of any kind
3With 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	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
BOD, 5-day, 20 deg. C	58	10	August 31, 2012	93% over the limit
Solids, total suspended	182	5	September 30, 2009	76% over the limit
pH, minimum	1	1	May 31, 2007
BOD, carbonaceous [5 day, 20 C]	191	0
Flow	49	0
Temperature, water deg. centigrade	47	0
Coliform, fecal general	43	0
pH	42	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 WA0023396.

Inspections

EPA’s inspection file holds no inspection for NPDES WA0023396.

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 WA0023396.

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

Watch this permit

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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 WA0023396 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 WA0023396 held by Mukilteo Water & Wastewater District for its Mukilteo, WA wastewater treatment plant, with the permit listed as Effective and classed as a Minor discharger. The facts list 0 pollutants under a numeric limit and 3 pollutants with an effluent exceedance, alongside 8 pollutants on file.