The U.S. Environmental Protection Agency (EPA) announced that it is extending the public comment period for 30 days on its advanced notice of proposed rulemaking (ANPR) for the hydraulic fracturing chemicals and mixtures rule. The ANPR was published on May 19, and comments were originally due on August 18; however the notice extends the deadline for public comments until September 18. EPA is seeking public comment on how it can obtain information on chemical substances and mixtures used in hydraulic fracturing, and whether it should implement a regulatory (under TSCA sec. 8(a) and/or 8(d)) and/or voluntary method to obtain this information. EPA is also seeking comment on ways to minimize reporting burdens and avoid duplication of state and other federal agency reporting requirements, while maximizing the data available for EPA risk characterizations.