D.C. Mun. Regs. tit. 25-C, § 6413
6413.1 Potable water shall be used to supply water to all pools and shall meet the requirements of the applicable provisions of 40 C.F.R. Part 141 - National Primary Drinking Water Regulations, and the District of Columbia drinking water quality standards.
SOURCE: Final Rulemaking published at 55 DCR 012845 (December 26, 2008).