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Clean Water Act discharge permit · NPDES OR0020761

HERMISTON STP, Hermiston, OR: NPDES OR0020761 discharge permit, effluent exceedances, inspections, penalties

HERMISTON STP, held by HERMISTON, CITY OF, holds NPDES permit OR0020761, which discharges to Umatilla River (Rm 5.2). EPA’s file records it issued September 1, 2016 and expiring July 31, 2021. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filedHERMISTON STP
Permittee as filedHERMISTON, CITY OF
NPDES IDOR0020761
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMajor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedSeptember 1, 2016
Expiration dateJuly 31, 2021
AddressHermiston, OR 97838
Receiving waterUMATILLA RIVER (RM 5.2)
SubwatershedHermiston Ditch-Umatilla River (HUC 170701031305)

Cited to the EPA ICIS-NPDES permit file (ECHO 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
Turbidity0420
BOD, 5-day, 20 deg. C32300
Solids, total suspended32280
E. coli12280
Flow, in conduit or thru treatment plant10250
pH8240
Chlorine, total residual5230
Alkalinity, total [as CaCO3]3180
Temperature, water deg. centigrade5100
Chlorine usage3100
Nitrogen, ammonia total [as N]880
BOD, 5-day, percent removal450
Solids, suspended percent removal450
Temperature, water deg. fahrenheit040
Excess thermal load200
Report due [yrmoda]200

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES OR0020761.

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

DateWhat EPA recordedAgency
February 6, 2026Permit Violations - Unapproved OperationST6
March 15, 2023Reporting Violations - Failure to NotifyST6
June 21, 2022Monitoring Violations - Failure to Monitor for Non-Toxicity RequirementsST6
October 22, 2021Reporting Violations - Failure to submit required report (non-DMR non-pretreatment)ST6
March 11, 2021WW SSO - Discharge to WatersST6

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.

Watch this permit

One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, OR0020761.

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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 OR0020761 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.