* [http://fracfocus.org/ FracFocus], sponsored by the Interstate Oil and Gas Compact Commission and the Ground Water Protection Council, lists chemicals used in over 94,000 wells.
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* [http://fracfocus.org/ FracFocus], sponsored by the Interstate Oil and Gas Compact Commission and the Ground Water Protection Council, lists chemicals used in over 100,000 wells.
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* Baker Hughes, world’s third largest hydraulic fracturing service provider, has since 2014 provides a complete, public list of chemicals in its hydraulic fracturing fluids.