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EPA-regulated facilities in Lewis and Clark County, MT

There are 1,213 EPA-regulated facilities inside Lewis and Clark County, Montana. The most common kinds are water discharge (781), hazardous waste (248), drinking water systems (152). 8 are currently in significant noncompliance, the EPA's designation for the most serious or persistent violations, and 40 have a violation on record. Penalties over the last five years total $5.3M across 3 sites.

Open the map of Lewis and Clark County

1,213facilities in the county
8in significant noncompliance
40with a violation on record
$5.3Min penalties, last 5 years

By category

CategoryFacilities
Hazardous waste248
Large quantity generators1
Small quantity generators106
Chemical (RMP/TRI)11
Superfund16
Air emissions50
Major sources1
Synthetic minor sources2
Minor sources11
Water discharge781
Major permits2
Minor permits655
Drinking water systems152
Greenhouse gas reporters2
Scrap yards8
Recycling centers1

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.

Largest penalties

Penalties assessed over the last five years.

Superfund sites

Towns in Lewis and Clark County

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.