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Clean Water Act discharge permit · NPDES MO0098752

MADISON MINE, Fredericktown, MO: NPDES MO0098752 discharge permit, effluent exceedances, inspections, penalties

MADISON MINE, held by Missouri Mining Investments, LLC, holds NPDES permit MO0098752, which discharges to Tollar Branch. EPA’s file records it issued June 12, 2024 and expiring June 30, 2029. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filedMADISON MINE
Permittee as filedMissouri Mining Investments, LLC
NPDES IDMO0098752
Permit statusEffective
Permit typeIndividual permit
Discharger classMajor discharger
Facility typeNot a publicly owned treatment works
ProgramIndustrial stormwater
IssuedJune 12, 2024
Expiration dateJune 30, 2029
AddressFredericktown, MO 63645
Receiving waterTollar Branch
SubwatershedSaline Creek-Little St Francis River (HUC 080202020102)

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
Nickel, total recoverable7440288June 30, 20265,752% over the limit
Cobalt, total recoverable11317179June 30, 2026174% over the limit
Copper, total recoverable7310173June 30, 20263,825% over the limit
Lead, total recoverable7272124June 30, 20266,127% over the limit
Cadmium, total recoverable76561June 30, 20261,700% over the limit
Solids, total suspended76351June 30, 20261,400% over the limit
Freeboard42725April 30, 2022100% over the limit
Chlorides + Sulfates62618June 30, 202661% over the limit
Zinc, total recoverable716612March 31, 2026100% over the limit
pH8359February 28, 2023
Toxicity [acute], Ceriodaphnia dubia288June 30, 202699,999% over the limit
Solids, settleable0146June 30, 2018150% over the limit
Sulfate [as S]61372September 30, 20099% over the limit
Pass/Fail Static 48Hr Acute Ceriodaphnia dubia062January 31, 2011
Arsenic, total recoverable3120
LC50 Static 48Hr Acute Pimephales promelas070
Flow, in conduit or thru treatment plant660
Cyanide, total [as CN]940
Chloride640
Oxygen demand, chem. [high level] [COD]140
Manganese, total recoverable040
Oil and grease [soxhlet extr.] tot.500
Arsenic, total [as As]200
Toxicity [acute], Pimephales promelas [Fathead Minnow]200
Mercury, total [as Hg]200
Toxicity [chronic], Ceriodaphnia dubia100
Toxicity [chronic], Pimephales promelas [Fathead Minnow]100
Storm water flow100

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
June 4, 2026Reporting Violations - Improper/ Incorrect ReportingST6
June 4, 2026Effluent Violations - Numeric effluent violationST6
July 5, 2022Permit Violations - Violation Specified in CommentST6
July 5, 2022Effluent Violations - Numeric effluent violationST6
July 5, 2022WW Storm Water Construction - Failure to develop any or adequate SWPPP/SWMPST6
April 22, 2022Effluent Violations - Numeric effluent violationST6
April 22, 2022WW Storm Water Construction - Failure to develop any or adequate SWPPP/SWMPST6
February 8, 2022Effluent Violations - Numeric effluent violationST6
February 3, 2022Effluent Violations - Numeric effluent violationST6
February 3, 2022Permit Violations - Violation Specified in CommentST6
October 14, 2021Effluent Violations - Numeric effluent violationST6
May 28, 2021Effluent Violations - Numeric effluent violationST6
March 30, 2021Effluent Violations - Numeric effluent violationST6
November 4, 2019Permit Violations - Violation Specified in CommentST6
November 4, 2019WW SSO - Failure to report violation that may endanger public health 122.41(l)(7)ST6
October 28, 2019Permit Violations - Violation Specified in CommentST6
July 15, 2019WW Storm Water Construction - Failure to develop any or adequate SWPPP/SWMPST6
July 15, 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.

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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 MO0098752 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.