D.C. Mun. Regs. tit. 25-G, § 505
505.1 Plumbing fixtures such as handwashing sinks, toilets, and urinals shall be cleaned as often as necessary to keep them clean and well-maintained.
505.2 All body art establishments shall be equipped with toilet facilities, which include a water closet and handwashing sinks, including hot and cold running water, hand cleaning liquid or powder, and a paper towel dispenser or equivalent hand drying equipment.
505.3 Each body art establishment used for tattoo or body piercing shall contain a mop sink and a hand sink with hot and cold running water, antibacterial soap and single-use towels in dispensers.
505.4 All restrooms shall be kept in sanitary condition and good repair.
SOURCE: Final Rulemaking published at 64 DCR 13496 (December 29, 2017).