Data changelog
This log records material corrections and trust-surface changes we applied after publication. The how-to-report process lives on the editorial & corrections policy. Entries are past-tense and tied to repository commits; nothing is invented to pad the list. This public log starts on 2026-08-08.
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4e38138
Public /corrections alias and identity CiteThis blocks
Added a /corrections redirect to the editorial corrections process, a public /changelog of corroborated changes, and Cite this page blocks on identity and legal pages so readers have a stable citation string and a clear path to report data issues.
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17d7cfb
SDWIS/UCMR5 source reproducibility proof
Made SDWIS and UCMR5 source downloads archive-aware and documented a full rebuild from declared EPA sources, verified on an isolated copy so state-code corrections never overwrite live tribal-primacy records.
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c19b4e1
Sitemap lastmod moved to page-vintage
Static and rankings sitemap entries now advertise per-route page-vintage lastmod values instead of a single empty data-vintage stamp, so crawlers see honest freshness on file-authored surfaces.
Download the SDWIS/UCMR5 state landscape snapshot cited on this page: sdwis-state-landscape.csv (same CSV as /statistics, CC0).