Pollution in Lewis And Clark County, Montana

Lewis And Clark County contains 178 EPA-regulated facilities, 8 of which are currently flagged for significant noncompliance. The county also hosts 2 Superfund sites and 4 TRI chemical reporters. EPA has assessed $5.3M in lifetime penalties and TRI reporters disclosed roughly 19.2k lb of on-site releases. That facility count is well above the Montana state average of 40 per county.

Superfund2NPL sites
TRI Facilities4reporters
EPA Facilities178regulated
Sig. Violators8current SNC

Superfund sites

SiteCityStatus
Upper Tenmile Creek Mining AreaHelenaCleanup underway
East Helena SiteEast HelenaCleanup underway

Largest releasers

FacilityCityOn-site (lb)Status
American ChemetEast Helena14.1kCompliant
U.s. Army National Guard Fort Harrison RangesFort Harrison5.1kCompliant

Significant violators

FacilityCityPenaltiesLast Inspected
City Of Helena WwtpHelena$20.0k2026-01-21
Milford ColonyWolf Creek$0
Boeing HelenaHelena$02023-09-29
Milford ColonyWolf Creek$02025-09-19
Glacier Point SubdivisionHelena$02022-01-13
Bouma Post YardsLincoln$02022-05-24
Elk Creek ColonyAugusta$02025-01-30
Hayfield Estates Ii Lot 25 Jamor Subdivision Wastewater Treatment SystemHelena$02025-11-19