EPA-regulated facilities in Jefferson County, MT

There are 295 EPA-regulated facilities inside Jefferson County, Montana. The most common kinds are water discharge (194), drinking water systems (57), hazardous waste (27). 1 is currently in significant noncompliance, the EPA's designation for the most serious or persistent violations, and 24 have a violation on record.

Open the map of Jefferson County

295facilities in the county

1in significant noncompliance

24with a violation on record

$0in penalties, last 5 years

By category

Category	Facilities
Hazardous waste	27
Small quantity generators	11
Chemical (RMP/TRI)	6
Superfund	11
Air emissions	13
Major sources	2
Minor sources	1
Water discharge	194
Minor permits	157
Drinking water systems	57
Greenhouse gas reporters	2

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.

STONEY BROOK VILLAGE CONDOS 20 STONEY BROOK DR, CLANCY, MT, 59634 Significant noncompliance

Superfund sites

BOULAWAY S23, T06 N, R03, ELKHORN, MT, 59632
ELKHORN MINING DISTRICT TOWNSHIP 006N/003W, BOULDER, MT, 59632
ELKHORN CREEK TAILINGS ELKHORN RD., ELKHORN, MT, 59632
ELKHORN QUEEN (22-027) 006N/003W SECTION 34, ELKHORN, MT, 56932
TACOMA (22-284) 006N/003W SECTION 34, BOULDER, MT, 59634
CARMODY S14, T06 N, R03 W, BOULDER, MT, 59632
UNION ELKHORN S11, T06 N, R03 W, ELKHORN, MT, 56932
C&D MINE S11, T06 N, R03 W, ACRES 20.56, C & D LODE MS 1620, BOULDER, MT, 59632
IRON MINE S02, T06 N, R03 W, BOULDER, MT, 59632
SKYLINE S08, T06 N, R02 W, ELKHORN, MT, 59632

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.