D.C. Mun. Regs. tit. 25-D, § 603
603.1 Water from a public water system or potable water shall meet the requirements of the applicable provisions of 40 CFR Part 141 – National Primary Drinking Water Regulations, and District of Columbia drinking water quality standards.
603.2 Potable water shall be used for drinking and sanitizing of equipment, furniture, devices, or fixtures.
Source: Final Rulemaking published at 56 DCR 7975 (October 9, 2009).