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Clean Water Act discharge permit · NPDES MT0020044

LEWISTOWN WWTP, Lewistown, MT: NPDES MT0020044 discharge permit, effluent exceedances, inspections, penalties

LEWISTOWN WWTP, held by CITY OF LEWISTOWN, holds NPDES permit MT0020044, which discharges to Big Spring Creek. EPA’s file records it issued February 14, 2001 and expiring February 28, 2006. 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 filedLEWISTOWN WWTP
Permittee as filedCITY OF LEWISTOWN
NPDES IDMT0020044
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMajor discharger
Facility typePublicly owned treatment works
ProgramPublicly owned treatment works
IssuedFebruary 14, 2001
Expiration dateFebruary 28, 2006
Issuing agencyMONTANA DEQ
AddressLewistown, MT 59457
Receiving waterBIG SPRING CREEK
SubwatershedMiddle Big Spring Creek (HUC 100401030706)

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, total suspended43630December 31, 20251,159% over the limit
BOD, 5-day, percent removal11413April 30, 2023230% over the limit
Solids, suspended percent removal198April 30, 2025387% over the limit
Coliform, fecal general354June 30, 2010129% over the limit
BOD, 5-day, 20 deg. C4113June 30, 2010270% over the limit
E. coli, MTEC-MF083September 30, 2024367% over the limit
Phosphorus, total [as P]150
Phenols130
pH220
Nitrogen, ammonia total [as N]120
Nitrogen, Kjeldahl, total [as N]120
Nitrite + Nitrate total [as N]120
Cyanide, total [as CN]120
Temperature, water deg. centigrade020
Flow rate020
Nitrogen, total [as N]020
Arsenic, total [as As]110
Cadmium, total [as Cd]110
Chromium, total [as Cr]110
Copper, total [as Cu]110
Lead, total [as Pb]110
Molybdenum, total [as Mo]110
Nickel, total [as Ni]110
Silver, total [as Ag]110
Zinc, total [as Zn]110
Selenium, total [as Se]110
Mercury, total [as Hg]110
Hardness, total [as CaCO3]010
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
Mercury, total recoverable010
Flow, in conduit or thru treatment plant200
Toxicity [acute], Ceriodaphnia dubia100
Toxicity [acute], Pimephales promelas [Fathead Minnow]100
Oil and grease visual100

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
March 31, 2026Reporting Violations - Improper/ Incorrect ReportingST6
May 16, 2024Management Practice Violations - Improper Operation and MaintenanceST6
February 13, 2024Monitoring Violations - Invalid/Unrepresentative SampleST6
February 13, 2024Effluent Violations - Unapproved BypassST6
February 13, 2024Effluent Violations - Narrative Effluent ViolationST6
February 13, 2024Management Practice Violations - Improper Operation and MaintenanceST6
February 16, 2022Monitoring Violations - Improper Analysis or Lab ErrorST6
February 16, 2022Reporting Violations - Improper/ Incorrect ReportingST6
November 14, 2019Reporting Violations - Improper/ Incorrect ReportingST6
June 20, 2018Reporting Violations - Failure to submit required report (non-DMR non-pretreatment)ST6

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 MT0020044 there.

Nearby on the register

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

What this page shows

This public-records page covers NPDES permit MT0020044 for the LEWISTOWN WWTP, a publicly owned treatment works in Lewistown, MT, held by CITY OF LEWISTOWN and discharging to Big Spring Creek in the Middle Big Spring Creek subwatershed (HUC 100401030706). The permit is listed as administratively continued, is classed as a Major Discharger, and the page reports 45 pollutants on file, 27 of which are under a numeric limit and 6 of which show an effluent exceedance.