EPA Expands Chemical Vapor Testing in Downtown Billings
Owners of 81 downtown buildings will see new EPA testing for chemical vapors from a historic contamination site.
Updated on Oct. 29, 2026 in Home Cleaning
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The Environmental Protection Agency has identified 81 additional buildings in downtown Billings for chemical vapor testing. This initiative follows the agency’s ongoing investigation into a decades-old PCE and TCE contamination plume extending from 715 Central Avenue.
Why it matters
Chemical vapors from the historic Superfund site continue to pose potential infiltration risks to properties in the downtown area. Mitigation efforts are critical as these volatile organic compounds can enter homes through cracks in foundation floors or utility conduits.
The EPA is expanding testing to 81 buildings after previously announcing mitigation plans for 400 homes. These efforts address a plume originating from a site where 3,600 tons of dirt were excavated 20 years ago.
The players
Environmental Protection Agency
The federal agency tasked with protecting human health and the environment through the management of Superfund sites and hazardous waste cleanup.
Moss Mansion
A historic property in downtown Billings now included in the latest round of environmental vapor testing.
The details
Contaminated groundwater carries PCE and TCE chemicals beneath structures, allowing vapors to rise and enter indoor spaces. To measure these gases, contractors drill small holes through basement floor slabs and install ports that collect air samples. This process allows the EPA to determine if internal vapor concentrations exceed safety thresholds.
Timeline
20 years ago: Initial excavation of 3,600 tons of contaminated soil occurred at 715 Central Avenue.
June 2026: The EPA announced plans to install mitigation systems in 400 homes.
November 2026: The EPA returns to the area with a mobile laboratory to measure vapor levels.
2028: The agency anticipates the issuance of a formal cleanup document.
The Home Front
The EPA’s expansion of vapor testing marks an ongoing phase in the long-term remediation of the Billings Superfund site. This process follows standard regulatory protocols for managing subsurface contamination that threatens residential and commercial air quality.
Residents in downtown Billings should monitor official communications from the EPA regarding access for vapor testing at their properties. If you own an older home in the affected zone, consult with a licensed professional to inspect your foundation for cracks or gaps where utility conduits enter the basement.
The takeaway
Ongoing environmental testing remains a standard requirement for properties situated near historic industrial contamination sites. Keep records of any testing results or mitigation system installations provided by environmental contractors for your home history file.
Further reading
For guidance on maintaining indoor air quality, visit the Home Cleaning section.
Source note: This article includes information reported by Q2 News (KTVQ).
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