Colorado will require energy companies to disclose the concentrations of all chemicals in hydraulic fracturing and also ask drillers to make public some information about ingredients considered trade secrets.


Arkansas, Montana, Texas, and Wyoming all require companies to disclose the chemicals in fracking fluid but not their concentrations, said Matt Watson, senior energy policy manager for the Environmental Defense Fund. Louisiana and New Mexico only require disclosure of some chemicals deemed workplace hazards by the Occupational Safety and Health Administration. Other states, including Michigan and Pennsylvania, have proposed similar regulations.

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