Climate change threatens drinking water safety worldwide
Extreme weather events driven by climate change — wildfires, floods, and droughts — are contaminating drinking water supplies and straining infrastructure, leaving communities vulnerable to long-term health risks.
Jim Robbins reports for Yale Environment 360.
In short:
- Wildfires can introduce toxic chemicals like benzene into water systems when burning homes and infrastructure damage pipes, as seen in Paradise, California.
- Flooding increases contamination risks by overwhelming water systems, washing pollutants into reservoirs, and damaging treatment facilities, as seen in Asheville, North Carolina.
- Droughts can degrade water quality by concentrating organic materials in reservoirs, leading to toxic byproducts when treated with disinfectants.
Key quote:
"Wastewater systems are not designed for this changing climate. They were designed for an older climate that probably doesn’t exist anymore."
— Sri Vedachalam, water expert
Why this matters:
The reality of climate change is now flowing straight into America’s drinking water. Across the country, water systems designed for a more stable climate are straining under new and intensifying threats. Wildfires, once seasonal disasters, now burn with such intensity that they send contaminants like ash and heavy metals into reservoirs and distribution lines. At the same time, extreme rainfall is overwhelming treatment plants, allowing sewage and industrial pollutants to seep into drinking water supplies.
Public health experts warn that as these disruptions increase, millions of people could face unsafe drinking water. Exposure to contaminants like lead, PFAS chemicals, and bacteria from untreated sewage carries long-term health risks, from cancer to gastrointestinal illness. Rural communities, often dependent on aging wells or small municipal systems, may be the most vulnerable.
Related: Climate impacts on water could raise clean energy costs in the US West
