Rankings
The lists that
make the data legible.
Ranked lists built from the same source data behind every report on this site. Each ranking publishes its methodology — no "best-of" without sourcing.
Policy RankingPublished May 21, 2026
The 14 States That Actually Require Schools to Test for Lead
Of the 50 U.S. states, only 14 have written into law that K-12 schools must test their drinking water for lead. The other 36 leave it to district discretion.
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Contaminant RankingPublished May 21, 2026
10 States With the Most Documented PFAS Contamination Sources
PFAS is everywhere — but in these 10 states, the contamination has been traced to specific, identifiable industrial or military sites.
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Why ranked lists? Most people don't read methodology pages, but they will scan a ranked list and look up where their state lands. Each ranking here links back to the same source data the reports use — transparency is the entire point.