This polygon dataset represents impervious surface in Fairfax County. This dataset also includes areas that drain to Fairfax County. This includes port
Areas of radon potential within Fairfax County. These areas were developed by short-term test results from a study conducted by the Fairfax County Health Department during the winters of 1986-87 and
30-year housing unit forecasts at a parcel level within Fairfax County developed on the VALID_TO date in the attribute table. For methodology and a data dictionary please view the <a target='_blank
