The 2022 Edition of the Recommended Standards for Water Works, commonly referred to as the 10 States Standards are policies that act as guidelines for the design, review and approval of plans and specifications for public wastewater collection and treatment facilities in Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, New York, Ohio, Ontario, Pennsylvania, and Wisconsin.
Every five years, the committee reviews and revises these standards to address recent or upcoming regulations and/or new technologies. The updated 2022 version of the Recommended Standards for Water Works section 5.8.1.d.9 has improved its language to allow water treatment plants to contain their chlorine gas instead of neutralizing it.
