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Clean Water Act discharge permit · NPDES MO0129852

MOSCOW MILLS CROOKED CREEK WWTP, Moscow Mills, MO: NPDES MO0129852 discharge permit, effluent exceedances, inspections, penalties

MOSCOW MILLS CROOKED CREEK WWTP, held by City of Moscow MIlls, holds NPDES permit MO0129852, which discharges to Crooked Cr.. EPA’s file records it issued June 26, 2014 and expiring December 31, 2018. 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 filedMOSCOW MILLS CROOKED CREEK WWTP
Permittee as filedCity of Moscow MIlls
NPDES IDMO0129852
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
IssuedJune 26, 2014
Expiration dateDecember 31, 2018
AddressMoscow Mills, MO 63362
Receiving waterCrooked Cr.
SubwatershedCrooked Creek (HUC 071100080402)

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]214189May 31, 20251,264% over the limit
Solids, total suspended311140April 30, 202516,733% over the limit
BOD, 5-day, 20 deg. C310235April 30, 2025200% over the limit
pH25010September 30, 2025
Oxygen, dissolved [DO]2438May 31, 200960% over the limit
Coliform, fecal general0168September 30, 201319,900% over the limit
BOD, 5-day, percent removal098January 31, 2021567% over the limit
E. coli097September 30, 2025745% over the limit
Solids, suspended percent removal087January 31, 2024507% over the limit
E. coli, colony forming units [CFU]2235October 31, 2018534% over the limit
Oil and grease [soxhlet extr.] tot.2344July 31, 2018193% over the limit
Copper, total recoverable2102December 31, 202227% over the limit
Flow, in conduit or thru treatment plant2300
Hardness, total [as CaCO3]280
Nickel, total recoverable280
Phosphorus, total [as P]260
Turbidity050
Nitrogen, Kjeldahl, total [as N]040
Nitrite + Nitrate total [as N]040
Nitrogen, total [as N]220
Zinc, total recoverable220
Toxicity [acute], Ceriodaphnia dubia120
Toxicity [acute], Pimephales promelas [Fathead Minnow]120

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 5, 2025Effluent Violations - Numeric effluent violationST6
June 12, 2024Reporting Violations - Improper/ Incorrect ReportingST6
June 12, 2024Management Practice Violations - Improper Operation and MaintenanceST6
April 3, 2024Effluent Violations - Numeric effluent violationST6
October 11, 2019Permit Violations - Violation Specified in CommentST6
August 12, 2019Permit Violations - Violation Specified in CommentST6
August 12, 2019Effluent Violations - Numeric effluent violationST6
August 12, 2019Reporting Violations - Improper/ Incorrect ReportingST6
July 6, 2017Reporting Violations - Improper/ Incorrect ReportingST6

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 September 15, 2026.

What this page shows

This public-records page covers the NPDES MO0129852 discharge permit for the Moscow Mills Crooked Creek WWTP in Moscow Mills, MO, held by City of Moscow MIlls, which discharges to Crooked Cr. The permit is listed as administratively continued, with a Minor discharger class, and the file shows 16 pollutants under a numeric limit and 12 pollutants with an effluent exceedance, with the status and dates as they stood on September 15, 2026, according to EPA's permit file.