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Data

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These are the compiled tables this site renders from, exported as CSV. Take them, check our figures against them, and use them in your own work. Attribution is appreciated and a link is better.

Compiled 2026-09-03

  • County summary

    counties.csv

    One row per US county: population, EPA radon zone, and counts of NPL sites, federal cleanup sites, TRI facilities, reported release pounds, PFAS-detecting water systems and open fuel-tank releases.

  • Superfund NPL sites

    superfund-npl.csv

    Every site on EPA's National Priorities List with status, hazard score, listing and deletion dates, coordinates and county.

  • PFAS results by water system

    pfas-systems.csv

    One row per public water system in EPA's UCMR5 testing round: population served, source type, whether PFAS was detected, whether it exceeded a final federal limit, and the highest single result in ng/L.

Provenance. Every column derives from a federal release, not from any modelling of ours. The methodology page names each source, its retrieval date and its known limits, and those limits carry into these files unchanged.

Licence. The underlying federal data is public domain. Our compilation, joins and slugs are offered for reuse with attribution to umwelt.com.

Something wrong? A wrong figure here is worth more to us than a polite one. How corrections work