The U.S. Environmental Protection Agency (EPA) has released guidance intended for states, tribes and other authorities on water reuse. Prepared jointly by EPA and the U.S. Agency for International Development, the guidance summarizes existing domestic regulations and identifies water reuse projects outside the United States. It includes 100 global case studies on water reuse as well as information on planning for future water reuse systems, indirect potable reuse and industrial reuse, and disinfection and treatment technologies. According to the guidance, which updates a 2004 version, 30 states and one territory have adopted regulations, and 15 states have guidelines or design standards that govern water reuse.