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Clean Water Act discharge permit · NPDES WA0029548

SNOHOMISH STP, Snohomish, WA: NPDES WA0029548 discharge permit, effluent exceedances, inspections, penalties

SNOHOMISH STP, held by City of Snohomish, holds NPDES permit WA0029548. EPA’s file records it issued May 21, 2018 and expiring June 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 filedSNOHOMISH STP
Permittee as filedCity of Snohomish
NPDES IDWA0029548
Permit statusEffective
Permit typeIndividual permit
Discharger classMinor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedMay 21, 2018
Expiration dateJune 30, 2023
Issuing agencyState
AddressSnohomish, WA 98290
Receiving water impaired303(D) Listed
SubwatershedSnohomish River-Frontal Possession Sound (HUC 171100110203)
Program components on filePOTW, Pretreatment
SIC4952 – 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

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
BOD, carbonaceous [5 day, 20 C]019314October 31, 2012173% over the limit
Nitrogen, ammonia total [as N]01813August 31, 2010387% over the limit
Solids, total suspended01567December 31, 202380% over the limit
Chlorine, total residual0556December 31, 20123,919% over the limit
Coliform, fecal general0516November 30, 2008233% over the limit
Solids, suspended percent removal075January 31, 201647% over the limit
Carbonaceous oxygen demand, % removal042December 31, 200755% over the limit
pH, minimum011November 30, 2010
Rainfall duration01700
Duration of discharge01700
Rainfall01000
Volume, total01000
Flow0920
Temperature, water deg. centigrade0480
pH0380
Oxygen, dissolved [DO]0140
Phosphorus, dissolved reactive [drp as P]0100
Nitrogen, Kjeldahl, total [as N]080
Phosphorus, total [as P]080
Nitrite + Nitrate total [as N]040
BOD, 5-day, 20 deg. C030

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

EPA’s single-event violation file, as loaded, holds no violation for NPDES WA0029548.

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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Nearby on the register

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

What this page shows

This public-records page covers NPDES permit WA0029548 for SNOHOMISH STP in Snohomish, WA, held by City of Snohomish, with a permit status of Effective and a Minor Discharger class. The facts list 21 pollutants on file, 8 pollutants under a numeric limit, 8 pollutants with an effluent exceedance, and 21 with a violation of any kind.