CDPHE Enviroscreen data for Jefferson County. 

Source: https://www.cohealthmaps.dphe.state.co.us/arcgis/rest/services/ENVIROSCREEN/Colorado_EnviroScreen_v1/MapServer/0
Data source: https://data-cdphe.opendata.arcgis.com/datasets/CDPHE::colorado-enviroscreen-v1-blockgroup/about
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