Notice is hereby given that the State of Nevada revised its approved State primacy program under the Federal Safe Drinking Water Act (SDWA) by adopting regulations that effectuate the Federal Radionuclides Rule. The Environmental Protection Agency (EPA) has determined that Nevada's revision request meets the applicable SDWA program revision requirements and the regulations adopted by Nevada are no less stringent than the corresponding Federal regulations. Therefore, EPA approves this revision to Nevada's approved State primacy program. However, this determination on Nevada's request for approval of a program revision shall take effect in accordance with the procedures described below in the SUPPLEMENTARY INFORMATION section of this notice after the opportunity to request a public hearing.