D.C. Mun. Regs. tit. 25-D, § 708
708.1 A toilet room located on the premises shall be completely enclosed and provided with a tight-fitting and self-closing door, except that this requirement does not apply to a toilet room that is located outside a massage establishment or health spa facility.
708.2 Toilet room doors shall be kept closed except during cleaning and maintenance operations.
Source: Final Rulemaking published at 56 DCR 7975 (October 9, 2009).