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Each refresh is published as a dated release with its own record counts and content hashes. Cite the release version and the figure stays checkable after the next refresh.
Release 2026.08.21
103,483 records across 16 datasets
Nelson Environmental Remediation Ltd. (2026). North American contamination dataset compilation, release 2026.08.21. Retrieved from https://nelsonremediation.com/data/releases/2026.08.21.
What changed
EPA UCMR 5 drinking water results3,452 to 3,453 records (+1)
Water Quality Portal PFAS monitoring stations6,256 to 6,256 records
EPA SEMS Superfund sites with PFAS records475 to 476 records (+1)
DoD PFAS assessment installations352 to 353 records (+1)
Federal Contaminated Sites Inventory PFAS sites97 to 98 records (+1)
AFFF overlap layer (derived)410 to 410 records
EPA open leaking underground storage tank releases65,892 to 65,894 records (+2)
LUST release and closure totals by state51 to 51 records
LUST release totals by county3,142 to 3,142 records
LUST closure cohorts by state51 to 51 records
Texas closure detail40 to 40 records
Federal Contaminated Sites Inventory petroleum sites8,020 to 8,021 records (+1)
Canadian petroleum closure cohorts by province13 to 13 records
Canada Energy Regulator pipeline incidents1,500 to 1,500 records
Military and defence contaminated sites9,839 to 9,840 records (+1)
Military site project dossiers3,885 to 3,885 records
Release 2026.08.16
103,475 records across 16 datasets
Nelson Environmental Remediation Ltd. (2026). North American contamination dataset compilation, release 2026.08.16. Retrieved from https://nelsonremediation.com/data/releases/2026.08.16.
What changed
First published release of the compilation. Later releases list every dataset that moved.
Dataset compilation copyright 2026 Nelson Environmental Remediation Ltd. All rights reserved. Source attribution required. Reuse, republication, redistribution or model training on this compilation must credit Nelson Environmental Remediation Ltd. and link to nelsonremediation.com.