Clean Water Act discharge permit · NPDES MTG130011

YELLOWSTONE RIVER HATCHERY, Big Timber, MT: NPDES MTG130011 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
4Pollutants under a numeric limit
0Pollutants with an effluent exceedance
0Inspections on file
0Formal enforcement actions

YELLOWSTONE RIVER HATCHERY, held by MONTANA FISH WILDLIFE AND PARKS, holds NPDES permit MTG130011, which discharges to Yellowstone River. EPA’s file records it issued August 23, 2011 and expiring June 30, 2016.

YELLOWSTONE RIVER HATCHERY, Big Timber, Montana: Coverage under a general permit MTG130011, held by MONTANA FISH WILDLIFE AND PARKS; Administratively continued (past its expiration date and still in force until reissued); issued August 23, 2011, term to June 30, 2016, by MONTANA DEQ; discharges to YELLOWSTONE RIVER.

Flow rate: 2 limits, 10 violations of any kind, 0 effluent exceedances.
Fish feed used: 2 limits, 10 violations of any kind, 0 effluent exceedances.
Solids, total suspended: 1 limit, 5 violations of any kind, 0 effluent exceedances.
Nitrogen, total [as N]: 0 limits, 5 violations of any kind, 0 effluent exceedances.
Nitrogen, Kjeldahl, total [as N]: 0 limits, 5 violations of any kind, 0 effluent exceedances.
Nitrite + Nitrate total [as N]: 0 limits, 5 violations of any kind, 0 effluent exceedances.
Phosphorus, total [as P]: 0 limits, 5 violations of any kind, 0 effluent exceedances.
Polychlorinated biphenyls [PCBs]: 1 limit, 3 violations of any kind, 0 effluent exceedances.

September 10, 2026: Letter of Violation/ Warning Letter (State).
July 10, 2018: Monitoring Violations - Invalid/Unrepresentative Sample (ST6).
July 10, 2018: WW CAFO - Failure to Maintain Records or Meet Record Keeping Requirements (ST6).

Other permits held by MONTANA FISH WILDLIFE AND PARKS

MONTANA FISH WILDLIFE AND PARKS LAKE FIVE 318, Coram: MTB007411
MURRAY SPRINGS FISH HATCHERY, Eureka: MTG130001, issued August 22, 2011
GIANT SPRINGS FISH HATCHERY, Great Falls: MTG130002, issued August 22, 2011
BIG SPRINGS HATCHERY, Lewistown: MTG130003, issued August 22, 2011
BIG SPRINGS TROUT HATCHERY, Lewistown: MTG130004, issued August 22, 2011
BLUEWATER SPRINGS HATCHERY, Bridger: MTG130012, issued August 23, 2011
WASHOE PARK TROUT HATCHERY, Anaconda: MTG130013, issued August 23, 2011
FLATHEAD LAKE SALMON HATCHERY, Somers: MTG130014, issued August 23, 2011
MFWP MILES CITY FISH HATCHERY, Miles City: MTG130015, issued August 23, 2011
FORT PECK MULTI SPECIES FISH HATCHERY, Fort Peck Dredge Cuts Fishing Access Site: MTG130017, issued August 23, 2011

YELLOWSTONE RIVER HATCHERY among its neighbors

EPA’s permit file holds 2 discharge permits in the Yellowstone River-Whitetail Creek subwatershed (HUC 100700021109), MTG130011 among them. Its county holds 33, 0 of them major permits; MTG130011 is a minor permit.

Other permits in the Yellowstone River-Whitetail Creek subwatershed (HUC 100700021109)

BIG TIMBER – TN FTTH PROJECT 2022, Big Timber: MTR109228, minor permit, discharging to YELLOWSTONE RIVER, permit term to December 31, 2022

Identity

Facility as filed	YELLOWSTONE RIVER HATCHERY
Permittee as filed	MONTANA FISH WILDLIFE AND PARKS
NPDES ID	MTG130011
Permit status	Administratively continued (past its expiration date and still in force until reissued)
Permit type	Coverage under a general permit
Discharger class	Minor discharger
Facility type	Not a publicly owned treatment works
Issued	August 23, 2011
Expiration date	June 30, 2016
Issuing agency	MONTANA DEQ
Address	Big Timber, MT 59011
Receiving water	YELLOWSTONE RIVER
Subwatershed	Yellowstone River-Whitetail Creek (HUC 100700021109)

Effluent limits and exceedances

8Pollutants on file
4Under a numeric limit
8With a violation of any kind
0With 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
Flow rate	2	10
Fish feed used	2	10
Solids, total suspended	1	5
Nitrogen, total [as N]	0	5
Nitrogen, Kjeldahl, total [as N]	0	5
Nitrite + Nitrate total [as N]	0	5
Phosphorus, total [as P]	0	5
Polychlorinated biphenyls [PCBs]	1	3

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MTG130011.

Inspections, violations and enforcement

2Single-event violations

Date	What EPA recorded	Agency
July 10, 2018	Monitoring Violations - Invalid/Unrepresentative Sample	ST6
July 10, 2018	WW CAFO - Failure to Maintain Records or Meet Record Keeping Requirements	ST6

Inspections

EPA’s inspection file holds no inspection for NPDES MTG130011.

Formal enforcement and penalties

0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.

Informal enforcement

Date	What EPA recorded	Agency
September 10, 2026	Letter of Violation/ Warning Letter	State

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

This public-records page covers Clean Water Act discharge permit NPDES MTG130011 for YELLOWSTONE RIVER HATCHERY in Big Timber, MT, held by MONTANA FISH WILDLIFE AND PARKS and discharging to the Yellowstone River within the Yellowstone River-Whitetail Creek subwatershed (HUC 100700021109). The permit is listed as administratively continued, with 8 pollutants on file, 4 under a numeric limit, and 0 showing an effluent exceedance.