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Clean Water Act discharge permit · NPDES MT0020656

HINSDALE COUNTY WATER AND SEWER, Hinsdale, MT: NPDES MT0020656 discharge permit, effluent exceedances, inspections, penalties

HINSDALE COUNTY WATER AND SEWER, held by HINSDALE WATER AND SEWER DISTRICT, holds NPDES permit MT0020656, which discharges to Milk River. EPA’s file records it issued June 19, 2012 and expiring July 31, 2017. 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 filedHINSDALE COUNTY WATER AND SEWER
Permittee as filedHINSDALE WATER AND SEWER DISTRICT
NPDES IDMT0020656
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 19, 2012
Expiration dateJuly 31, 2017
AddressHinsdale, MT 59241
Receiving waterMILK RIVER
Receiving water impaired303(D) Listed
SubwatershedMilk River-Hinsdale (HUC 100500120401)

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
Solids, suspended percent removal14937August 31, 2010567% over the limit
E. coli, MTEC-MF44534June 30, 202517,360% over the limit
BOD, 5-day, percent removal13927February 28, 2021567% over the limit
Coliform, fecal general03327April 30, 20064,471% over the limit
Solids, total suspended56113August 31, 2010463% over the limit
BOD, 5-day, 20 deg. C56012May 31, 201967% over the limit
Nitrite + Nitrate total [as N]23310December 31, 2020158% over the limit
pH3313November 30, 2005
Chlorine, total residual0213September 30, 2005374% over the limit
Phosphorus, total [as P]2320
Nitrogen, total [as N]2290
Flow rate0240
Nitrogen, ammonia total [as N]3200
Temperature, water deg. centigrade3150
Nitrogen, Kjeldahl, total [as N]1140
Hardness, total [as CaCO3]150
Flow rate240
Cadmium, total [as Cd]240
Copper, total [as Cu]240
Zinc, total [as Zn]240
Solids, total dissolved [TDS]030
Oxygen, dissolved [DO]020
Arsenic, total recoverable010
Selenium, total recoverable010
Thallium, total recoverable010
Beryllium, total recoverable [as Be]010
Nickel, total recoverable010
Silver total recoverable010
Zinc, total recoverable010
Cadmium, total recoverable010
Lead, total recoverable010
Chromium, total recoverable010
Copper, total recoverable010
Antimony, total recoverable010
Phenolics, total recoverable010
Mercury, total recoverable010
Cyanide, total recoverable010
Pass/Fail Static 48Hr Acute Ceriodaphnia dubia010
LC50 Static 48Hr Acute Pimephales promelas010
Oil & Grease100

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
August 24, 2023Monitoring Violations - Analysis not ConductedST6
August 24, 2023Management Practice Violations - Failure to Maintain RecordsST6
August 24, 2023Management Practice Violations - Improper Operation and MaintenanceST6
August 24, 2023Reporting Violations - Improper/ Incorrect ReportingST6
July 25, 2019Management Practice Violations - Improper Operation and MaintenanceST6
July 25, 2019Monitoring Violations - Analysis not ConductedST6
July 25, 2019Monitoring Violations - Invalid/Unrepresentative SampleST6
July 25, 2019Reporting Violations - Improper/ Incorrect ReportingST6
July 25, 2019Management Practice Violations - Failure to Maintain RecordsST6

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.

Watch this permit

One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, MT0020656.

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  • One state — $4,990/year
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How we handle your data → Privacy

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 MT0020656 there.

Nearby on the register

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