D.C. Mun. Regs. tit. 25-C, § 6430
6430.1 A plumbing system and hoses conveying water shall be designed, constructed, installed and repaired with approved materials according to the ICC International Plumbing Code/2000 as amended by the D.C. Plumbing Code Supplement/ 2003 (Title 12F of the District of Columbia Municipal Regulations), and subsequent amendments, hereinafter referred to as the "Plumbing Code".
6430.2 A plumbing fixture such as a handwashing facility, toilet, or urinal shall be easily cleanable. N
SOURCE: Final Rulemaking published at 55 DCR 012845 (December 26, 2008).