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Clean Water Act discharge permit · NPDES MO0052663

CLARKTON WWTF, Clarkton, MO: NPDES MO0052663 discharge permit, effluent exceedances, inspections, penalties

CLARKTON WWTF, held by City of Clarkton, holds NPDES permit MO0052663, which discharges to Tributary To E. Ditch #1. EPA’s file records it issued June 14, 2022 and expiring June 30, 2027. 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 filedCLARKTON WWTF
Permittee as filedCity of Clarkton
NPDES IDMO0052663
Permit statusEffective
Permit typeIndividual permit
Discharger classMinor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedJune 14, 2022
Expiration dateJune 30, 2027
AddressClarkton, MO 63837
Receiving waterTributary to E. Ditch #1
Receiving water impaired303(D) Listed
SubwatershedDitch No 85-The Floodway (HUC 080202040503)
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
E. coli, colony forming units [CFU]05652May 31, 202299,999% over the limit
E. coli24139October 31, 202599,999% over the limit
BOD, 5-day, 20 deg. C34129February 28, 2026563% over the limit
Solids, total suspended33422March 31, 2026713% over the limit
BOD, 5-day, percent removal12115February 28, 2026493% over the limit
Nitrogen, ammonia total [as N]202814February 28, 2026953% over the limit
Solids, suspended percent removal11914January 31, 2026453% over the limit
Chlorine, total residual066August 31, 2011300% over the limit
Coliform, fecal general066August 31, 201199,999% over the limit
pH291October 31, 2008
Phosphorus, total [as P]4440
Nitrogen, total [as N]0320
Flow, in conduit or thru treatment plant2180
Oil and grease [soxhlet extr.] tot.2160
Nitrogen, Kjeldahl, total [as N]4120
Nitrite + Nitrate total [as N]4120
Toxicity [acute], Ceriodaphnia dubia010
Toxicity [acute], Pimephales promelas [Fathead Minnow]010

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
December 10, 2025Effluent Violations - Numeric effluent violationST6
October 2, 2025Effluent Violations - Numeric effluent violationST6
March 31, 2025Effluent Violations - Numeric effluent violationST6
March 31, 2025Management Practice Violations - No Licensed/Certified OperatorST6
December 30, 2024Effluent Violations - Numeric effluent violationST6
November 27, 2024Permit Violations - Violation Specified in CommentST6
January 26, 2024Effluent Violations - Numeric effluent violationST6
December 27, 2022Effluent Violations - Numeric effluent violationST6
March 28, 2022Effluent Violations - Numeric effluent violationST6
March 31, 2021Effluent Violations - Numeric effluent violationST6
October 9, 2020Effluent Violations - Numeric effluent violationST6
March 21, 2017Effluent Violations - Numeric effluent violationST6

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 MO0052663 for the CLARKTON WWTF in Clarkton, MO, held by City of Clarkton, with a permit status of Effective and a discharger class of 12. The page lists 18 pollutants on file, 12 under a numeric limit, 10 with an effluent exceedance, and 1 pollutant with a violation of any kind.