The availability of ground water will vary with the geology of an area.  Consequently, not all areas in the State of Ohio contain ground water in quantities capable of serving as a public water supply. 

    The most productive areas in the state are the buried valley aquifers, such as the Great Miami Buried Valley Aquifer, in the southwest, south-central, and east-central portions of the state.  Some of the least productive aquifers in the state occur predominantly in southeast Ohio, but also can be found along the eastern shore of Lake Erie and in parts of southwest and south-central Ohio.  The bedrock aquifers in these locations contain a very high percentage of clay minerals.  Formations with high clay content are poor aquifers because they have very few or very small pore spaces for ground water or be stored in or flow through. 
 

Maps

Drastic Map    

Butler Ground Water Resource Map   

The Great Miami Buried Valley Aquifer Map    

Butler Pollution Potential Map

Ohio Ground Water Resources Map    

Source Water Protection Areas

These maps are not to be used for determining regulatory compliance with the provisions of the Wellhead Protection ordinance.  It has been prepared for the purpose of public education and providing general guidance on requirements under the WHPP