ChescoMaps - Chester County, PAThe FEMA 100 Year Flood Zones layer contains flood zone values A, AE and AO. This data layer is FEMA's official National Flood Hazard Layer for Chester County. The effective date is 9/29/2017 .ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/053eb2545cff4487b515602cb6b289cf_0engChester County GIS DataPublicFEMA 100 Year Flood Zones [Pennsylvania--Chester County]Web servicesPennsylvania--Chester CountyPennsylvaniaLast Modified: 2018-01-03