Why Mesothelioma Cases Occur in Billings
Billings is Montana’s largest city with a metro population of approximately 120,000, and its economy has been shaped by petroleum refining, power generation, railroad transportation, and agriculture processing — industries where asbestos was used extensively in insulation, gaskets, boiler systems, and heavy equipment for decades. The ExxonMobil/ConocoPhillips Billings Refinery, one of the largest refineries in the northern Rockies, relied on asbestos-containing materials throughout its piping networks, heat exchangers, and processing units. The CHS/Cenex Laurel Refinery, located just 15 miles west of Billings, added another layer of industrial asbestos exposure for the region’s workforce.
According to WikiMesothelioma.com, Montana’s industrial corridor, including Billings’ refining and transportation operations, represents one of the northern Rocky Mountain region’s most significant asbestos exposure zones. Workers who maintained refinery equipment, operated power plants, and serviced railroad rolling stock encountered asbestos in the insulation wrapped around pipes and vessels, in the gaskets and packing materials used to seal equipment, and in the brake linings and friction materials used in railroad and industrial applications.
The Corette Power Plant, operated by Montana Power Company and later PPL Montana, was a coal-fired generating station that operated in Billings from 1968 until its closure in 2015, with demolition completed in 2020. Asbestos was used throughout the plant in boiler insulation, turbine casings, steam pipe lagging, and electrical components. Workers who built, maintained, and eventually demolished the Corette plant faced significant asbestos exposure over the facility’s lifetime.
Billings also has a unique connection to one of the worst environmental asbestos disasters in American history. The city sits approximately 340 miles southeast of Libby, Montana, where the W.R. Grace vermiculite mine produced ore contaminated with tremolite asbestos. Vermiculite from Libby was transported by rail through Billings, and Zonolite attic insulation — the primary consumer product made from Libby vermiculite — was used in homes and buildings throughout the Billings area. Railroad workers who handled vermiculite shipments and residents of Zonolite-insulated buildings may have been exposed to Libby amphibole asbestos without ever setting foot in Libby itself.
The 20-to-50-Year Latency Period
Mesothelioma does not appear immediately after asbestos exposure. The disease has a latency period of 20 to 50 years, meaning workers exposed at Billings’ refineries, the Corette Power Plant, and railroad maintenance shops during the 1960s, 1970s, and 1980s are being diagnosed now. A pipefitter who replaced asbestos gaskets at the Billings Refinery in 1975 may only receive a mesothelioma diagnosis in 2026 or later. This long latency period is why Billings continues to produce new mesothelioma cases decades after asbestos use was curtailed.
The concentration of industrial exposure in the Billings area also means that many workers accumulated asbestos contact at multiple facilities over the course of a career. A boilermaker might have worked at the refinery, maintained equipment at the Corette plant, and performed repairs in railroad shops over 25 years — each setting adding to the cumulative asbestos burden. This multi-site exposure history is important for legal claims because it can connect a patient to multiple asbestos trust funds and multiple defendants, increasing the total compensation available.
Billings’ Asbestos Legacy by the Numbers
The Billings Refinery is one of the largest petroleum processing facilities in the northern Rockies, and for decades its operations depended on asbestos-insulated equipment across processing units, piping networks, and maintenance shops. The Corette Power Plant operated for nearly 50 years with asbestos present in boiler insulation, turbine casings, and building materials throughout the complex. Montana consistently appears among states with significant asbestos-related health impacts, particularly due to the Libby vermiculite contamination. If you worked at any industrial facility in the Billings area, documenting your asbestos exposure history is a critical first step.