Wildfires in the Pacific Northwest are no longer rare summer events; they're a reliable feature of the annual cycle. Washington's 2023 fire season burned 165,365 acres across 1,884 ignitions, the second-highest number of starts in state record. The Gray and Oregon Road Fires in Spokane County burned 20,902 combined acres, destroyed 400+ homes, and took 2 lives. The 2025 PNW forecast projected elevated fire risk across the Columbia River Basin starting in June and elevated risk across most of Washington and eastern Oregon by July. For homeowners with private wells and aging plumbing, wildfires create a specific water quality problem that's only recently been well-documented: VOCs, volatile organic compounds, contaminating service lines, water meters, and plumbing in and near burned areas.
The Paradise Case
The 2018 Camp Fire that destroyed Paradise, California produced benzene concentrations as high as 2,217 µg/L in service lines, massively exceeding the EPA Maximum Contaminant Level of 5 µg/L for chronic exposure. Paradise has served as the primary case study for understanding how wildfires contaminate drinking water systems.
The Detroit, Oregon Case, Peer-Reviewed Documentation
Oregon's 2020 Labor Day Fires hit Detroit, Oregon hard. Peer-reviewed studies published in AWWA Water Science and ACS ES&T Water documented significant VOC contamination in burned service lines, benzene, toluene, naphthalene, styrene, and other compounds. This was the first comprehensive scientific documentation of the mechanism.
The Mechanism, Where VOCs Come From
Contrary to what many homeowners assume, VOCs rarely enter drinking water through treatment plants or water mains. The contamination is specifically in service lines, meters, and home plumbing, typically PVC, HDPE, or PEX materials. Two primary pathways:
- Smoke drawn into depressurized systems. When a fire destroys a home's plumbing fixtures and leaves open pipes, or when water demand drops during a fire event, smoke and combustion products can be sucked into the distribution system.
- Thermal degradation of plastic pipes. Service line plastics exposed to high heat during a fire degrade chemically, releasing VOCs that then leach into water flowing through the damaged pipes.
This is why "the treatment plant is fine" doesn't mean your home water is safe after a fire.
Post-Fire Water Testing
Washington Department of Health and Oregon Health Authority issue post-fire "Do Not Drink / Do Not Boil" advisories for areas where wildfires have damaged drinking water infrastructure. Boiling does NOT remove VOCs, it can concentrate them through evaporation. Flushing alone is not sufficient if the plastic itself has degraded; replacement of affected service lines may be required.
Treatment That Actually Works
- Granular Activated Carbon (GAC): Up to 99.9% removal of certain VOCs including benzene. The primary technology for residential VOC treatment.
- Reverse Osmosis alone: Only 70–80% removal, VOCs pass through RO membranes to a significant degree. Not adequate as sole barrier.
- Best practice: Combined GAC + RO for drinking water. The GAC stage captures VOCs; the RO captures inorganics and residuals.
Before the Next Fire Season, Prevention Checklist
- Identify your home's service line material (PVC, PEX, copper, galvanized). Plastic lines are most VOC-vulnerable.
- Create a defensible space around your well and service entry.
- Know your water system's emergency contacts and advisory process.
- Baseline-test your water in a non-fire period so a post-fire test has a reference point.
Post-Fire Assessment Services
Water Guys serves communities impacted by fires across eastern Washington and the Spokane region. Post-fire water testing, GAC + RO system design, and coordination with local utilities on service line status. Contact us for an assessment.