EPA-regulated facilities in Big Horn County, WY

There are 332 EPA-regulated facilities inside Big Horn County, Wyoming. The most common kinds are water discharge (166), hazardous waste (95), air emissions (50). 2 are currently in significant noncompliance, the EPA's designation for the most serious or persistent violations, and 23 have a violation on record.

Open the map of Big Horn County

332facilities in the county

2in significant noncompliance

23with a violation on record

$0in penalties, last 5 years

By category

Category	Facilities
Hazardous waste	95
Small quantity generators	44
Transporters	2
Chemical (RMP/TRI)	11
Superfund	3
Air emissions	50
Major sources	5
Synthetic minor sources	3
Minor sources	7
Water discharge	166
Major permits	1
Minor permits	120
Drinking water systems	26
Greenhouse gas reporters	4

A facility enrolled in several programs counts once in the total and once in each of its categories.

In significant noncompliance

The EPA's designation for its most serious or persistent violations, as of the latest data.

HOMESTEAD FIELD DISPOSAL (UNKNOWN ADDRESS), (UNKNOWN CITY), WY, 00000 Significant noncompliance
GREYBULL WASTEWATER LAGOON OFFSTREAM RIVER, GREYBULL, WY, 82426 Significant noncompliance

Superfund sites

BLM-SOUTH BIGHORN COUNTY LANDFILL OFF OF US 20, GREYBULL, WY, 82410
BASIN SCHOOL CHEMICALS 911 W. B STREET, BASIN, WY, 82410
COWBOY TIMBER TREATING 91 HWY 31, MANDERSON, WY, 82432

Bordering counties

Reading these numbers

These are regulatory records, not measurements of pollution. Most facilities appear because they hold a permit or file reports, and most of them are compliant; a listing is not a claim that a facility has polluted anything. Compliance status and penalties are the EPA's own determinations in data retrieved Oct 9, 2026. The Data page explains where each record comes from and how it can mislead.