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Clean Water Act discharge permit · NPDES MO0127175

MATTHEWS WWTF, Matthews, MO: NPDES MO0127175 discharge permit, effluent exceedances, inspections, penalties

MATTHEWS WWTF, held by CITY OF MATTHEWS, holds NPDES permit MO0127175, which discharges to Tributary To Ditch #104. EPA’s file records it issued August 30, 2017 and expiring March 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 filedMATTHEWS WWTF
Permittee as filedCITY OF MATTHEWS
NPDES IDMO0127175
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
IssuedAugust 30, 2017
Expiration dateMarch 31, 2021
AddressMatthews, MO 63867
Receiving waterTributary to Ditch #104
SubwatershedTown of North Llibourn (HUC 080202040605)

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
Nitrogen, ammonia total [as N]45248August 31, 20251,133% over the limit
BOD, 5-day, 20 deg. C22620December 31, 2022271% over the limit
Solids, suspended percent removal11210September 30, 2024567% over the limit
Solids, total suspended2148May 31, 202493% over the limit
BOD, 5-day, percent removal1108April 30, 2024567% over the limit
pH262August 31, 2025
Oil and grease [soxhlet extr.] tot.242July 31, 2023103% over the limit
Phosphorus, total [as P]240
Nitrogen, Kjeldahl, total [as N]040
Nitrite + Nitrate total [as N]040
Flow, in conduit or thru treatment plant220
E. coli020
Nitrogen, total [as N]200
E. coli, colony forming units [CFU]200
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
December 10, 2025Effluent Violations - Numeric effluent violationST6
January 13, 2025Effluent Violations - Numeric effluent violationST6
January 13, 2025WW Storm Water Construction - Failure to develop any or adequate SWPPP/SWMPST6
December 30, 2024Effluent Violations - Numeric effluent violationST6
June 28, 2024Effluent Violations - Numeric effluent violationST6
November 16, 2023Reporting Violations - Failure to Submit DMRsST6
September 29, 2021Effluent Violations - Numeric effluent violationST6
September 24, 2019Effluent Violations - Numeric effluent violationST6
July 9, 2019Effluent 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.

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, MO0127175.

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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 MO0127175 there.

Nearby on the register

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