18 CFR §420.44
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Water used exclusively for cooling purposes which is returned to the stream in compliance with the effluent requirements of applicable water quality standards, shall be charged at the non-consumptive use rate except that losses due to in-stream evaporation caused by cooling uses will be charged as consumptive use.