NPL Superfund Linear Site Features: EPA Geospatial Data on Contaminated Sites

U.S. EPA Superfund Linear Site Features is a GIS dataset containing lines depicting important features of Superfund sites. The data is managed by regional EPA teams and harvested weekly by the SEGS system to refresh the national dataset. The dataset was last updated on March 22, 2026.

Use Cases

• Modeling linear contamination pathways like plumes or barriers based on geospatial line features.
• Integrating linear site features into broader environmental impact assessments for Superfund sites.
• Supporting regulatory reporting and site management workflows for EPA remedial program managers.

Strengths

• Data is managed by EPA regional teams of geospatial professionals and remedial program managers.
• National dataset is refreshed weekly via the SEGS harvesting system.
• Dataset is specifically designed for important Superfund features best captured as linear features.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Description metadata is limited; actual data quality requires manual inspection after download.

Provenance

Source

U.S. Environmental Protection Agency

Collection Method

Harvested weekly from regional EPA data by the SEGS system.

Time Range

null

Freshness

Last updated 2026-03-22 13:51:08.532402; freshness should be verified.

Geography

United States