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Clean Water Act discharge permit · NPDES MO0107174

WALNUT GROVE WWTP, Walnut Grove, MO: NPDES MO0107174 discharge permit, effluent exceedances, inspections, penalties

WALNUT GROVE WWTP, held by City of Walnut Grove, holds NPDES permit MO0107174, which discharges to Tributary To Sugar Creek. EPA’s file records it issued October 26, 2017 and expiring October 31, 2022. 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 filedWALNUT GROVE WWTP
Permittee as filedCity of Walnut Grove
NPDES IDMO0107174
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
IssuedOctober 26, 2017
Expiration dateOctober 31, 2022
AddressWalnut Grove, MO 65770
Receiving waterTributary to Sugar Creek
SubwatershedClear Creek (HUC 102901060205)

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
BOD, 5-day, 20 deg. C29621February 29, 202499,999% over the limit
Coliform, fecal general01818March 31, 200846,900% over the limit
Nitrogen, ammonia total [as N]67511April 30, 20251,170% over the limit
E. coli2673April 30, 2024511% over the limit
Solids, total suspended2792November 30, 201426% over the limit
pH2702May 31, 2019
Oil and grease [soxhlet extr.] tot.2662February 29, 202460% over the limit
Flow, in conduit or thru treatment plant2640
BOD, 5-day, percent removal1320
Solids, suspended percent removal1320
Toxicity [acute], Ceriodaphnia dubia110
Toxicity [acute], Pimephales promelas [Fathead Minnow]110

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
July 8, 2026Reporting Violations - Failure to Submit DMRsST6
March 25, 2025Reporting Violations - Improper/ Incorrect ReportingST6
December 26, 2024Reporting Violations - Failure to Submit DMRsST6
September 25, 2024Effluent Violations - Numeric effluent violationST6
August 2, 2024Reporting Violations - Improper/ Incorrect ReportingST6
November 20, 2023Reporting Violations - Failure to Submit DMRsST6
January 24, 2023Management Practice Violations - No Licensed/Certified OperatorST6
January 24, 2023Permit Violations - Violation Specified in CommentST6
January 24, 2023Reporting Violations - Failure to submit required report (non-DMR non-pretreatment)ST6
January 24, 2023Effluent Violations - Numeric effluent violationST6
January 24, 2023Management Practice Violations - Improper Operation and MaintenanceST6
January 24, 2023Permit Violations - Failure to Submit Timely Permit Renewal ApplicationST6
October 19, 2022Effluent Violations - Numeric effluent violationST6
October 19, 2022Permit Violations - Failure to Submit Timely Permit Renewal ApplicationST6
October 19, 2022Management Practice Violations - No Licensed/Certified OperatorST6
October 19, 2022Management Practice Violations - Improper Operation and MaintenanceST6
October 19, 2022Reporting Violations - Failure to submit required report (non-DMR non-pretreatment)ST6
October 19, 2022Reporting Violations - Improper/ Incorrect ReportingST6
October 19, 2022Permit Violations - Violation Specified in CommentST6
October 5, 2022Effluent Violations - Numeric effluent violationST6
August 25, 2022Management Practice Violations - No Licensed/Certified OperatorST6
August 25, 2022Reporting Violations - Improper/ Incorrect ReportingST6
August 25, 2022Permit Violations - Violation Specified in CommentST6
August 25, 2022Management Practice Violations - Improper Operation and MaintenanceST6
August 25, 2022Effluent Violations - Numeric effluent violationST6
August 25, 2022Permit Violations - Failure to Submit Timely Permit Renewal ApplicationST6
August 25, 2022Reporting Violations - Failure to submit required report (non-DMR non-pretreatment)ST6
July 8, 2021Effluent Violations - Numeric effluent violationST6
January 31, 2019Reporting Violations - Failure to Submit DMRsST6
November 16, 2017Permit Violations - Violation Specified in CommentST6
November 16, 2017Effluent 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 MO0107174 there.

Nearby on the register

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