The U.S. Environmental Protection Agency (EPA) is inviting small businesses, governments, and not-for-profit organizations to participate as small entity representatives (SERs) for a small business advocacy review (SBAR) Panel. This panel will focus on the agency's development of a rule that proposes to regulate the amount of perchlorate, a potentially harmful chemical, in drinking water. Federal law requires agencies to establish an SBAR Panel for rules that may have a significant economic impact on a substantial number of small entities.