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Clean Water Act discharge permit · NPDES MO0099465

ST CLAIR WWTF, St. Clair, MO: NPDES MO0099465 discharge permit, effluent exceedances, inspections, penalties

ST CLAIR WWTF, held by City of St Clair, holds NPDES permit MO0099465, which discharges to Tributary To Happy Sock Creek. EPA’s file records it issued February 1, 2021 and expiring March 31, 2025. 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 filedST CLAIR WWTF
Permittee as filedCity of St Clair
NPDES IDMO0099465
Permit statusEffective
Permit typeIndividual permit
Discharger classMajor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedFebruary 1, 2021
Expiration dateMarch 31, 2025
AddressSt. Clair, MO 63077
Receiving waterTributary to Happy Sock Creek
SubwatershedRoth Creek-Bourbeuse River (HUC 071401030404)
Program components on fileBiosolids, POTW, 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
Ammonia [as N] + unionized ammonia016117September 30, 20091,016% over the limit
Copper, total recoverable2437September 30, 201986,264% over the limit
Nitrogen, ammonia total [as N]20137July 31, 2026358% over the limit
Oil and grease [soxhlet extr.] tot.2106April 30, 2024130% over the limit
Arsenic, total recoverable2415December 31, 200932,122% over the limit
BOD, 5-day, percent removal143December 31, 2025567% over the limit
E. coli433July 31, 20264,638% over the limit
Cadmium, total recoverable0402December 31, 200544,344% over the limit
Mercury, total recoverable0402December 31, 200525,432% over the limit
Zinc, total recoverable2382December 31, 20055,191% over the limit
Lead, total recoverable2382December 31, 200536,742% over the limit
Nickel, total recoverable0382December 31, 200510,658% over the limit
Silver total recoverable0382December 31, 200588,789% over the limit
Chromium, total recoverable0382December 31, 200572,122% over the limit
BOD, 5-day, 20 deg. C362December 31, 202529% over the limit
Solids, suspended percent removal132January 31, 2025567% over the limit
pH2480
Cyanide, free [amenable to chlorination]0380
Nitrogen, Kjeldahl, total [as N]460
Nitrite + Nitrate total [as N]460
Phosphorus, total [as P]460
Flow, in conduit or thru treatment plant240
Toxicity [acute], Ceriodaphnia dubia240
Toxicity [acute], Pimephales promelas [Fathead Minnow]240
Solids, total suspended330
Di[2-ethylhexyl] phthalate [DEHP]220
Toxicity [chronic], Ceriodaphnia dubia010
Toxicity [chronic], Pimephales promelas [Fathead Minnow]010
Pass/Fail Static 48Hr Acute Ceriodaphnia dubia010
LC50 Static 48Hr Acute Pimephales promelas010
Hardness, total [as CaCO3]200
Chromium, hexavalent dissolved [as Cr]200

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 13, 2026Effluent Violations - Numeric effluent violationST6
February 13, 2026Pretreatment - Failure to Develop/Enforce StandardsST6
July 25, 2025Permit Violations - Violation Specified in CommentST6
July 25, 2025Reporting Violations - Failure to submit required report (non-DMR non-pretreatment)ST6
July 25, 2025Effluent Violations - Numeric effluent violationST6
March 20, 2025Effluent Violations - Numeric effluent violationST6
July 21, 2021Permit Violations - Violation Specified in CommentST6
July 21, 2021Reporting Violations - Improper/ Incorrect ReportingST6
July 21, 2021Reporting Violations - Failure to submit required report (non-DMR non-pretreatment)ST6
July 9, 2021Reporting Violations - Improper/ Incorrect ReportingST6
July 9, 2021Permit Violations - Violation Specified in CommentST6
February 19, 2020Effluent Violations - Numeric effluent violationST6
October 11, 2019Pretreatment - Failure to Develop/Enforce StandardsST6
May 23, 2017Pretreatment - Failure to Develop/Enforce StandardsST6

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 the NPDES MO0099465 Clean Water Act discharge permit for the ST CLAIR WWTF in St. Clair, MO, held by City of St Clair, which discharges to Tributary To Happy Sock Creek within the Roth Creek-Bourbeuse River subwatershed (HUC 071401030404). The permit is listed as Effective and classed as a Major Discharger, with 21 pollutants under a numeric limit, 16 pollutants with an effluent exceedance, and 32 pollutants on file. The permit was issued February 1, 2021 and expires March 31, 2025, with status as of October 14, 2026.