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   As of April 2012, oil and gas exploration and production (E&P) companies must disclose to regulators in the state of Colorado the chemicals they use in hydraulic fracturing operations, under a law enacted by the state legislature on December 13. Under the new law, E&P companies operating in Colorado will be required to identify the “fracking” chemicals they use, including proprietary chemicals, and the concentrations in which they’re used, and to provide 48 hours’ notice before pumping the chemicals into the ground. By requiring reporting of the chemical concentrations, the Colorado goes further than similar regulations in Texas. The passage of the Colorado law follows a preliminary finding by the EPA in early December of a possible link between hydraulic fracturing in Pavillion, Wyoming, and local groundwater contamination.