Global Scale of Drinking Water PFAS Contamination
PFAS contamination of drinking water is a worldwide problem. A 2020 analysis of PFAS in global drinking water estimated that hundreds of millions of people are exposed to PFAS-contaminated drinking water exceeding health advisory values. The problem is concentrated in industrialized regions with dense manufacturing, military activity, and urban water infrastructure, but reaches even remote areas through atmospheric deposition and long-range transport.
The European Environment Agency’s monitoring data identifies contaminated water systems across EU member states, with the highest concentrations in Italy (particularly the Veneto region), Germany (Rhine valley manufacturing areas), and Netherlands (near Dordrecht). U.S. Environmental Protection Agency monitoring under UCMR5 has identified thousands of public water systems with detectable PFAS, confirming that the problem is widespread across the U.S.
Global Hotspots
The Veneto region of Italy — where PFAS manufacturing by Miteni (formerly 3M subsidiary) contaminated the Agno-Fratta-Gorzone river basin — represents one of the world’s most severely affected areas, with hundreds of thousands of people exposed to highly contaminated water for decades. Legal proceedings against Miteni executives resulted in criminal convictions for environmental disaster.
In the U.S., communities surrounding military bases — including those near Peterson SFB (Colorado), Wright-Patterson AFB (Ohio), and Joint Base Cape Cod (Massachusetts) — rank among the highest PFAS-contaminated drinking water areas. Communities in PFAS manufacturing regions (Parkersburg WV; Decatur AL; Cottage Grove MN) have documented some of the highest historical human exposure levels.
Trends and Future Monitoring
Global PFAS monitoring is improving rapidly as analytical costs decrease and regulatory requirements expand testing programs. The introduction of EPA Method 533, which detects short-chain PFAS missed by earlier methods, is revealing contamination previously undetected in water systems that appeared compliant under older testing protocols.
International harmonization of monitoring methods, through organizations like ISO and WHO, will enable more consistent global data comparison. The World Health Organization is developing PFAS guidelines for drinking water that will provide a framework for countries without domestic standards. These global efforts will better characterize the worldwide burden of PFAS-contaminated drinking water.