Montana has 18 Superfund sites: 1.4% of the US total of 1,316. That ranks #23 by count and #3 per person (1.58 per 100,000 residents) of 51.
Source: EPA National Priorities List, September 2026. Every National Priorities List site in the 50 states and DC, at the EPA’s coordinates. Sites in the territories are left out.
Licence: U.S. government data: no copyright, free to reuse
Local blogs, news sites, parks pages: embed the live interactive map with one snippet. Attribution stays on, that's the whole deal.
<iframe src="https://get-instamaps.com/embed/rankings/superfund-sites/montana" width="100%" height="440" style="border:2px solid #111" loading="lazy" title="Montana superfund sites map — InstaMaps"></iframe>Anaconda Co. Smelter · Libby Ground Water Contamination · Milltown Reservoir Sediments · Silver Bow Creek/Butte Area · East Helena Site · Idaho Pole Co. · Mouat Industries · Montana Pole and Treating · Basin Mining Area · Upper Tenmile Creek Mining Area · Lockwood Solvent Ground Water Plume · Barker Hughesville Mining District
"Montana has 18 Superfund sites, #23 in the US by count and #3 per person (EPA National Priorities List, September 2026, mapped by InstaMaps)." Free to quote with a link to this page. Population: US Census 2024 estimates.