D.C. Mun. Regs. tit. 25-B, § 1909
1909.1 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 food processing operation and does not open directly into the food processing operation.
1909.2 Toilet room doors shall be kept closed except during cleaning and maintenance operations.
SOURCE: Final Rulemaking published at 56 DCR 5245 (July 3, 2009).