EPA Tests Billings Buildings for Chemical Vapors

Air sampling inside properties checks for PCE and TCE vapors linked to a former dry cleaner site on Central Avenue.

Updated on Nov. 7, 2026 in Home Cleaning

EPA Tests Billings Buildings for Chemical Vapors

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Do you trust local and federal officials to protect your community from underground chemical contamination?

The EPA is testing air inside buildings across Billings for PCE and TCE vapors that may be moving up from contaminated groundwater. The testing targets hundreds of private and commercial properties, one by one.

Why it matters

The chemicals are invisible and can move from groundwater into buildings, so residents and business owners need to know whether their properties are affected. Testing separates the presence of the chemicals from levels that pose health concerns.

Testing equipment detects PCE and TCE at part-per-trillion levels, well below EPA health benchmarks. The source contamination at 715 Central Ave. was a former dry cleaner, where the EPA excavated 3,600 tons of dirt about two decades ago; it is not yet known how many properties will show vapor intrusion.

The players

Environmental Protection Agency (EPA)

The federal agency leading the cleanup and vapor testing at the Billings Superfund contamination site.

The details

EPA crews pull air samples from inside buildings and analyze them in real time. Chlorinated solvents can vaporize and move through preferential pathways, and where vapors need to be controlled, mitigation systems can be installed.

About two decades ago: EPA dug 3,600 tons of contaminated dirt at 715 Central Ave.
November 6, 2026: EPA continued air testing of Billings buildings for PCE and TCE.

Home Cleaning Context

Legacy dry cleaning solvents like PCE have been tied to Superfund cleanups under CERCLA, where indoor vapor intrusion is a recognized exposure route. Homeowners in affected areas may face mitigation systems similar to those installed under EPA sub-slab vapor extraction programs.

Billings residents whose properties are tested may learn whether their building has vapor intrusion. Buildings may be automatically eligible for a sub-slab vapor extraction mitigation system depending on location within the site.

The takeaway

Residents in Billings should watch for EPA contact about indoor air testing and understand that invisible vapors can be present even when no odor is detected. Testing is the only reliable way to confirm whether a building is affected.