The official tool is hosted at https://screeningtool.geoplatform.gov
This source.coop repository provides access to this data as PMTiles and geoparquet. PMTiles provides static vector tiles enabling many popular client-side libraries to quickly and easily render interactive maps involving very large vector datasets. The Geoparquet format is optimized for cloud-based (i.e. streaming) analysis workflows without the need to download and store the data.
See map.py for soruce code