All data sourced directly from official government databases. Nothing is estimated, interpolated, or inferred. Every result links to its primary source.
PFASData.com aggregates data from five federal sources, each with different update frequencies and coverage.
Enforcement and Compliance History Online. Covers over 1 million regulated facilities — drinking water systems, industrial discharge sites, and Superfund locations. The backbone of our water system lookups.
echo.epa.gov ↗Integrates data from the Toxics Release Inventory (TRI), Safe Drinking Water Information System (SDWIS), and Superfund records. Over 200 PFAS compounds now tracked in TRI.
epa.gov/enviro ↗The Fifth Unregulated Contaminant Monitoring Rule. Requires testing of 29 PFAS compounds across all public water systems serving 3,300+. The most comprehensive PFAS drinking water dataset ever collected.
UCMR 5 Data Finder ↗A multi-agency portal (EPA + USGS + state agencies) covering surface water and groundwater sampling. Supports geo-based queries by county and watershed. Useful for non-drinking-water exposure pathways.
waterqualitydata.us ↗EPA bulk downloads covering 12 data categories: discharge monitoring, spills, federal sites, greenhouse gas data, industry sectors, production data, and more. Used for historical analysis.
PFAS Metadata ↗States like NJ, CA, and MI maintain PFAS databases with richer local data not captured in federal systems. Integration is ongoing. Minnesota's PRISM product reporting data will be a major addition.
Understanding where data is missing is as important as the data itself.
An estimated 43 million Americans rely on private wells. Federal monitoring programs cover only public water systems — private wells are almost entirely absent from these datasets. If you're on a well, the only way to know is to test.
Most results in federal databases are 1–3 years old. Many water providers have since taken action to reduce PFAS. This data shows past conditions, not necessarily today's treatment levels.
Systems serving fewer than 3,300 people were not required to test under UCMR 5. This creates a significant blind spot in rural and semi-rural communities where PFAS contamination from nearby sources may be present.
Several states maintain PFAS databases with richer local data not reflected in federal systems. Integration is ongoing and uneven. We flag this clearly for states where we know better local data exists.
The EPA finalized MCLs for six PFAS in April 2024 but has since signaled revisions for four of them. Health thresholds on this site will update as regulations change — we track this in our Active PFAS Data dashboard.
Food, food packaging, consumer products, and indoor air are significant exposure sources not covered here. This site focuses on water and soil data where federal monitoring exists. See Water Data for household exposure information.