In 5-4 ruling, with Justice Amy Coney Barrett joining liberal wing in dissent, the high court says EPA has the responsibility to provide details for wastewater plant discharge permits.
But in a surprise, court majority agrees to not block federal EPA GHG emissions rule from taking effect as it weighs opponents legal challenge to the mandate.
Justices will rule on arguments against EPA "generic" effluent discharge permitting, but declined to consider landowners' eminent domain challenge on the Mountain Valley gas pipeline.
With new standard vague for 'non-point' source pollutants from pipe spills, treated wastewater and related, dischargers and others struggle to understand U.S. Clean Water Act compiiance.
