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Clean Water Act discharge permit · NPDES MO0023132

THAYER WWTP, Thayer, MO: NPDES MO0023132 discharge permit, effluent exceedances, inspections, penalties

THAYER WWTP, held by City of Thayer, holds NPDES permit MO0023132, which discharges to Warm Fk. Spring R.. EPA’s file records it issued September 5, 2018 and expiring September 30, 2022.

THAYER WWTP, Thayer, Missouri: Individual permit MO0023132, held by City of Thayer; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued September 5, 2018, term to September 30, 2022; discharges to Warm Fk. Spring R..

  • Chlorine, total residual: 0 limits, 8 violations of any kind, 8 effluent exceedances, latest July 31, 2008, largest 216% over the limit.
  • E. coli: 2 limits, 3 violations of any kind, 3 effluent exceedances, latest April 30, 2026, largest 284% over the limit.
  • Solids, total suspended: 2 limits, 2 violations of any kind, 2 effluent exceedances, latest May 31, 2008, largest 107% over the limit.
  • Solids, suspended percent removal: 1 limit, 2 violations of any kind, 2 effluent exceedances, latest June 30, 2021, largest 120% over the limit.
  • BOD, 5-day, 20 deg. C: 2 limits, 1 violation of any kind, 1 effluent exceedance, latest May 31, 2008, largest 72% over the limit.
  • pH: 2 limits, 1 violation of any kind, 1 effluent exceedance, latest February 28, 2017.
  • Nitrogen, total [as N]: 4 limits, 0 violations of any kind, 0 effluent exceedances.
  • Phosphorus, total [as P]: 4 limits, 0 violations of any kind, 0 effluent exceedances.
  • Oil and grease [soxhlet extr.] tot.: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Nitrogen, ammonia total [as N]: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • Flow, in conduit or thru treatment plant: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • BOD, 5-day, percent removal: 1 limit, 0 violations of any kind, 0 effluent exceedances.
  • November 16, 2023: Reporting Violations - Failure to Submit DMRs (ST6).
  • December 28, 2017: Permit Violations - Violation Specified in Comment (ST6).

Missouri holds 756 Publicly owned treatment works coverages of this permit type in EPA’s file; 434 were issued before MO0023132. City of Thayer holds 2 permits in Missouri.

Other permits held by City of Thayer

Coverages issued nearest MO0023132

THAYER WWTP among its neighbors

EPA’s permit file holds 6 discharge permits in the Trace Creek-Spring River subwatershed (HUC 110100100205), MO0023132 among them. Its county holds 32, 0 of them major permits; MO0023132 is a minor permit.

Other permits in the Trace Creek-Spring River subwatershed (HUC 110100100205)

Identity

Facility as filedTHAYER WWTP
Permittee as filedCity of Thayer
NPDES IDMO0023132
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
IssuedSeptember 5, 2018
Expiration dateSeptember 30, 2022
AddressThayer, MO 65791
Receiving waterWarm Fk. Spring R.
SubwatershedTrace Creek-Spring River (HUC 110100100205)

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
Chlorine, total residual088July 31, 2008216% over the limit
E. coli233April 30, 2026284% over the limit
Solids, total suspended222May 31, 2008107% over the limit
Solids, suspended percent removal122June 30, 2021120% over the limit
BOD, 5-day, 20 deg. C211May 31, 200872% over the limit
pH211February 28, 2017
Nitrogen, total [as N]400
Phosphorus, total [as P]400
Oil and grease [soxhlet extr.] tot.200
Nitrogen, ammonia total [as N]200
Flow, in conduit or thru treatment plant200
BOD, 5-day, percent removal100

Inspections, violations and enforcement

DateWhat EPA recordedAgency
November 16, 2023Reporting Violations - Failure to Submit DMRsST6
December 28, 2017Permit Violations - Violation Specified in CommentST6

Inspections

EPA’s inspection file holds no inspection for NPDES MO0023132.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

EPA’s informal enforcement file holds no action for NPDES MO0023132.

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Nearby on the register

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

What this page shows

This public-records page covers NPDES permit MO0023132 for the THAYER WWTP in Thayer, MO, held by City of Thayer, which discharges to Warm Fk. Spring R. The page lists 12 pollutants on file, 11 under a numeric limit, and 6 with an effluent exceedance.