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Clean Water Act discharge permit · NPDES MO0003948

THOMAS HILL - MINING DIVISION, Clifton Hill, MO: NPDES MO0003948 discharge permit, effluent exceedances, inspections, penalties

THOMAS HILL - MINING DIVISION, held by Associated Electric Cooperative, Inc., holds NPDES permit MO0003948, which discharges to Tributary To M. Fk. Little Chariton R.. EPA’s file records it issued July 3, 2019 and expiring June 30, 2021.

THOMAS HILL - MINING DIVISION, Clifton Hill, Missouri: Individual permit MO0003948, held by Associated Electric Cooperative, Inc.; Industrial stormwater; Administratively continued (past its expiration date and still in force until reissued); issued July 3, 2019, term to June 30, 2021; discharges to Tributary to M. Fk. Little Chariton R..

  • Solids, total suspended: 12 limits, 8 violations of any kind, 5 effluent exceedances, latest August 31, 2023, largest 97% over the limit.
  • BOD, 5-day, 20 deg. C: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest February 28, 2006, largest 13% over the limit.
  • Specific conductance: 0 limits, 56 violations of any kind, 0 effluent exceedances.
  • Solids, settleable: 10 limits, 26 violations of any kind, 0 effluent exceedances.
  • Sulfate [as S]: 10 limits, 8 violations of any kind, 0 effluent exceedances.
  • Boron, total recoverable: 10 limits, 8 violations of any kind, 0 effluent exceedances.
  • Iron, total [as Fe]: 0 limits, 5 violations of any kind, 0 effluent exceedances.
  • Manganese, total [as Mn]: 0 limits, 4 violations of any kind, 0 effluent exceedances.
  • Storm water flow: 12 limits, 2 violations of any kind, 0 effluent exceedances.
  • pH: 12 limits, 1 violation of any kind, 0 effluent exceedances.
  • Oxygen demand, chem. [high level] [COD]: 12 limits, 0 violations of any kind, 0 effluent exceedances.
  • Chloride: 10 limits, 0 violations of any kind, 0 effluent exceedances.
  • Chlorides + Sulfates: 10 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.
  • Freeboard: 2 limits, 0 violations of any kind, 0 effluent exceedances.
  • September 19, 2022: Effluent Violations - Numeric effluent violation (ST6).

Missouri holds 210 Industrial stormwater coverages of this permit type in EPA’s file; 150 were issued before MO0003948. Associated Electric Cooperative, Inc. holds 9 permits in Missouri.

Other permits held by Associated Electric Cooperative, Inc.

Coverages issued nearest MO0003948

THOMAS HILL - MINING DIVISION among its neighbors

EPA’s permit file holds 1 discharge permits in the Muncas Creek subwatershed (HUC 102802030404), MO0003948 among them. Its county holds 82, 2 of them major permits; MO0003948 is a minor permit.

Identity

Facility as filedTHOMAS HILL - MINING DIVISION
Permittee as filedAssociated Electric Cooperative, Inc.
NPDES IDMO0003948
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMinor discharger
Facility typeNot a publicly owned treatment works
ProgramIndustrial stormwater
IssuedJuly 3, 2019
Expiration dateJune 30, 2021
AddressClifton Hill, MO 65244
Receiving waterTributary to M. Fk. Little Chariton R.
SubwatershedMuncas Creek (HUC 102802030404)
Other EPA IDs (FRS)RCRA handler MOD053979316; ICIS-AIR source MO0000002917500001

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, total suspended1285August 31, 202397% over the limit
BOD, 5-day, 20 deg. C011February 28, 200613% over the limit
Specific conductance0560
Solids, settleable10260
Sulfate [as S]1080
Boron, total recoverable1080
Iron, total [as Fe]050
Manganese, total [as Mn]040
Storm water flow1220
pH1210
Oxygen demand, chem. [high level] [COD]1200
Chloride1000
Chlorides + Sulfates1000
Oil and grease [soxhlet extr.] tot.200
Freeboard200

Inspections, violations and enforcement

DateWhat EPA recordedAgency
September 19, 2022Effluent Violations - Numeric effluent violationST6

Inspections

EPA’s inspection file holds no inspection for NPDES MO0003948.

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 MO0003948.

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Nearby on the register

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

What this page shows

This page covers Clean Water Act NPDES permit MO0003948 for THOMAS HILL - MINING DIVISION in Clifton Hill, MO, held by Associated Electric Cooperative, Inc., with a status of administratively continued and a Minor discharger class. The record lists 11 pollutants under a numeric limit and 2 pollutants with an effluent exceedance, and it gives the permit's issue date as July 3, 2019 and expiration date as June 30, 2021.