The Environmental Protection Agency on Wednesday imposed a two-year delay on rules governing wastewater discharge from coal-fired power plants as it begins a review of the requirements.

"Today's final rule resets the clock for certain portions of the agency's effluent guidelines for power plants, providing relief from the existing regulatory deadlines while the agency revisits some of the rule's requirements," said EPA Administrator Scott Pruitt.

The Obama administration imposed the rules in 2015.

The rule postpones the compliance dates for limiting discharges from and implementing pre-treatment standards for coal power plants, including "bottom ash transport water" and flue gas desulfurization wastewater, according to the EPA.