Clean Water Act discharge permit · NPDES MTG010233

THOMPSON CATTLE COMPANY, Billings, MT: NPDES MTG010233 discharge permit, effluent exceedances, inspections, penalties

Administratively continuedPermit status
MinorDischarger class
0Pollutants under a numeric limit
0Pollutants with an effluent exceedance

THOMPSON CATTLE COMPANY, held by THOMPSON CATTLE CO, holds NPDES permit MTG010233, which discharges to Dry Creek. EPA’s file records it issued October 19, 2021 and expiring October 31, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.

Identity

Facility as filed	THOMPSON CATTLE COMPANY
Permittee as filed	THOMPSON CATTLE CO
NPDES ID	MTG010233
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
Program	Concentrated animal feeding operations
Issued	October 19, 2021
Expiration date	October 31, 2023
Address	Billings, MT 59101
Receiving water	DRY CREEK
Subwatershed	Yellowstone River-Sevenmile Creek (HUC 100700070403)
SIC	0211 – Beef Cattle Feedlots

Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.

Effluent limits and exceedances

10Pollutants on file
0Under a numeric limit
10With 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	Effluent exceedances	Latest exceedance	Largest exceedance, as filed
BOD, 5-day, 20 deg. C	0	4	0
Solids, total suspended	0	4	0
Nitrogen, total [as N]	0	4	0
Nitrogen, ammonia total [as N]	0	4	0
Nitrite + Nitrate total [as N]	0	4	0
Phosphorus, total [as P]	0	4	0
E. coli, MTEC-MF	0	4	0
pH	0	2	0
Duration	0	2	0
Volume, total	0	2	0

EPA’s effluent violation file records no exceedance of a numeric limit for NPDES MTG010233.

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

5Single-event violations

Date	What EPA recorded	Agency
June 11, 2026	WW CAFO - Failure to Maintain Records or Meet Record Keeping Requirements	ST6
June 11, 2026	WW CAFO - Improper Mortality Management	ST6
June 11, 2026	WW CAFO - Management Practice Violations - Failure to Develop or Update NMP	ST6
June 11, 2026	WW CAFO - Best Management Practice Deficiencies	ST6
January 31, 2020	WW CAFO - Best Management Practice Deficiencies	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 MTG010233 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.

This public-records page covers Clean Water Act discharge permit NPDES MTG010233, held by THOMPSON CATTLE COMPANY of Billings, MT, which discharges to DRY CREEK in the Yellowstone River-Sevenmile Creek subwatershed (HUC 100700070403). The permit is listed as administratively continued, with a Minor discharger class, 0 pollutants under a numeric limit, and 0 pollutants with an effluent exceedance, under the Concentrated animal feeding operations program. The permit was issued October 19, 2021, with an expiration date of October 31, 2023.