The National Institute for Occupational Safety and Health (NIOSH) received a request for a health hazard evaluation at a poultry processing plant in Arkansas. The Occupational Safety and Health Administration submitted the request to determine health outcomes of an unintentional chlorine gas release in June 2011. NIOSH investigators visited the plant in June 2011, November 2011, and January 2012. The report includes the authors' findings and recommendations.