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Clean Water Act discharge permit · NPDES MO0090654

WILLIAMSVILLE WWTF, Williamsville, MO: NPDES MO0090654 discharge permit, effluent exceedances, inspections, penalties

WILLIAMSVILLE WWTF, held by City of Williamsville, holds NPDES permit MO0090654, which discharges to Tributary To Williams Cr.. EPA’s file records it issued June 14, 2016 and expiring March 31, 2020. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filedWILLIAMSVILLE WWTF
Permittee as filedCity of Williamsville
NPDES IDMO0090654
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMinor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedJune 14, 2016
Expiration dateMarch 31, 2020
AddressWilliamsville, MO 63967
Receiving waterTributary to Williams Cr.
SubwatershedWilliams Creek-Black River (HUC 110100070701)

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
Solids, suspended percent removal14343July 31, 2026567% over the limit
BOD, 5-day, percent removal13939May 31, 2026567% over the limit
Chlorine, total residual02222June 30, 20131,200% over the limit
E. coli21111August 31, 20235,138% over the limit
Coliform, fecal general01111June 30, 20133,800% over the limit
Solids, total suspended233October 31, 2024147% over the limit
pH262June 30, 2015
Oil and grease [soxhlet extr.] tot.222May 31, 202097% over the limit
Nitrogen, ammonia total [as N]411May 31, 202650% over the limit
BOD, 5-day, 20 deg. C211December 31, 200834% over the limit
Flow, in conduit or thru treatment plant200
Toxicity [acute], Ceriodaphnia dubia100
Toxicity [acute], Pimephales promelas [Fathead Minnow]100

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
March 29, 2024Effluent Violations - Numeric effluent violationST6
November 14, 2023Reporting Violations - Improper/ Incorrect ReportingST6
May 21, 2019Permit Violations - Violation Specified in CommentST6

Velarion’s copy of EPA’s ICIS-NPDES files does not yet 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, MO0090654.

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How we handle your data → Privacy

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 MO0090654 there.

Nearby on the register

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