Colorado approves nation's most comprehensive frack fluid disclosure rule

Colorado today adopted the nation's toughest rule requiring oil and gas drillers to disclose all the chemicals used in the fracking fluids they pump down wells.

"The level of detail required in this rule is much greater than other states require," said Mike Freeman, an attorney for the environmental law group Earthjustice.

The Colorado Oil and Gas Commission unanimously adopted the rule after last-minute negotiations among environmental groups, industry and state regulators.

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