Regional and County Groundwater Resources Several syntheses of extant information and information derived from directed research on water resources have been prepared in the form of water atlases, county groundwater reports, and regional studies. Six water atlases, prepared in cooperation with the U.S. Geological Survey, cover several counties and contain information on surface water, geology, water levels, potential well yields, water quality, and water use. Two U.S. Geological Survey water resources investigations reports discuss the hydrology, availability, and water quality of various aquifers in western Iowa. The 25 published county groundwater reports are syntheses of hydrogeologic information specific to the county, including the nature of groundwater occurrence, depth to various aquifers, potential well yields, water quality, and recommendations for well construction, water treatment, and well abandonment. In addition there are two water atlases and five water supply bulletins that deal with the groundwater resources of selected counties or areas. Iowa's Municipal Water-Supply Inventory (MWSI) is an active database of information about the water supplies of Iowa's municipalities and rural water supplies.     Key for legend: Central = The water story in central Iowa: GSB Water Atlas 1 (Table of Contents) East Central = Water resources of east-central Iowa: GSB Water Atlas 6 (Table of Contents) North Central = Water resources of north-central Iowa: GSB Water Atlas 7 (Table of Contents) Northeast = Water resources of northeast Iowa: GSB Water Atlas 8 (Table of Contents) South Central = Water resources of south-central Iowa: GSB Water Atlas 5 (Table of Contents) Southeast = Water resources of southeast Iowa: GSB Water Atlas 4 (Table of Contents) Southwest = Availability and quality of water from the alluvial, glacial-drift, and Dakota aquifers and water use in southwest Iowa: USGS Water Resources Investigation Report 91-4156 (Abstract) West Central = Hydrology of the alluvial, buried channel, basal Pleistocene and Dakota aquifer in west-central Iowa: USGS Water Resources Investigation Report 85-4239 (Abstract)   County groundwater reports are available for the following counties: Appanoose, Boone, Dallas, Davis, Des Moines, Grundy, Hamilton, Hardin, Henry, Iowa, Jefferson, Keokuk, Lee, Louisa, Lucas, Madison, Mahaska, Marion, Monroe, Polk, Story, Van Buren, Wapello, Warren, and Washington.   Below is a list of other regional and county groundwater resources publications available from the Geological Survey Bureau that are not shown on the map. Availability of groundwater in Decatur County, Iowa: GSB Water Atlas 2 (Abstract) Availability of groundwater in Wayne County, Iowa: GSB Water Atlas 3 (Abstract) Geology and groundwater resources of Webster County, Iowa: GSB Water Supply Bulletin 4 (Abstract) Geology and groundwater resources of Clayton County, Iowa: GSB Water Supply Bulletin 7 (Abstract) Geology and groundwater resources of Cerro Gordo County, Iowa: GSB Water Supply Bulletin 9 (Abstract) Geology and groundwater resources of Linn County, Iowa: GSB Water Supply Bulletin 10 (Abstract) Geohydrology of Muscatine Island, Muscatine County, Iowa: GSB Water-Supply Bulletin 11 (Abstract) An overview of groundwater quality in the Skunk River Basin: GSB Open File Report 87-3 (Abstract) Iowa's principal aquifers (Iowa Groundwater Association Compendium, October 1990)