CDC, through an initial grant from the National Swimming Pool Foundation, is working with public health and industry representatives across the United States to prevent drowning, injuries, and the spread of recreational water illnesses at public swimming pools and spas by building a Model Aquatic Health Code (MAHC). The MAHC will be a guidance document that can help local and state authorities make swimming and other water activities healthier and safer. The MAHC will serve as a model and guide for local and state agencies needing to update or implement swimming pool and spa code, rules, regulations, guidance, law, or standards governing the design, construction, operation, and maintenance of swimming pools, spas, hot tubs, and other treated or disinfected aquatic facilities.