Clean Water Act discharge permit · NPDES MTX000244

TOWN OF WEST YELLOWSTONE WASTEWATER TREATMENT PLANT, West Yellowstone, MT: NPDES MTX000244 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
15Pollutants under a numeric limit
1Pollutants with an effluent exceedance

TOWN OF WEST YELLOWSTONE WASTEWATER TREATMENT PLANT, held by TOWN OF WEST YELLOWSTONE, holds NPDES permit MTX000244, which discharges to Ground Water. EPA’s file records it issued July 1, 2018 and expiring June 30, 2023. 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 filed	TOWN OF WEST YELLOWSTONE WASTEWATER TREATMENT PLANT
Permittee as filed	TOWN OF WEST YELLOWSTONE
NPDES ID	MTX000244
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	State-issued individual permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	July 1, 2018
Expiration date	June 30, 2023
Address	West Yellowstone, MT 59758
Receiving water	GROUND WATER
Subwatershed	Lower South Fork Madison River (HUC 100200070205)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

15Pollutants on file
15Under a numeric limit
11With a violation of any kind
1With an effluent exceedance

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 measure	Limits	Violations, any kind	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
Nitrogen, total [as N]	7	13	2	September 30, 2025	6% over the limit
Flow rate	2	22	0
Solids, total suspended	6	7	0
Nitrite + Nitrate total [as N]	8	5	0
Specific conductance	5	4	0
Nitrogen, ammonia total [as N]	8	2	0
Nitrogen, Kjeldahl, total [as N]	8	2	0
Chloride [as Cl]	5	2	0
BOD, 5-day, 20 deg. C	2	2	0
Phosphorus, total [as P]	2	2	0
Solids, total dissolved [TDS]	2	2	0
Temperature, water deg. centigrade	6	0	0
pH	3	0	0
E. coli, MTEC-MF	3	0	0
Water level at sample collection time	3	0	0

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

2Single-event violations

Date	What EPA recorded	Agency
June 15, 2022	Management Practice Violations - Improper Operation and Maintenance	ST6
June 15, 2022	Reporting Violations - Improper/ Incorrect Reporting	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.

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, MTX000244.

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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 MTX000244 there.

Nearby on the register

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

This public-records page covers Clean Water Act discharge permit NPDES MTX000244, held by the Town of West Yellowstone for its wastewater treatment plant in West Yellowstone, MT, which discharges to ground water. The permit is administratively continued, with a minor discharger class, 15 pollutants under a numeric limit, and 1 pollutant with an effluent exceedance. The permit was issued July 1, 2018 and was listed with an expiration date of June 30, 2023, with status as of September 15, 2026.