On September 30, 2008, the Environmental Protection Agency (EPA) issued the long-awaited revision to its 2001 Public Health and Safety Standard for the proposed Yucca Mountain deep geologic repository for high-level radioactive waste and spent nuclear fuel. While the issuance of the standard allows the Nuclear<br/>Regulatory Commission (NRC) to issue its final conforming standards and move forward toward a final license decision for the facility, EPA’s standard raises several unprecedented regulatory issues and is likely to be further challenged in court.