D.C. Mun. Regs. tit. 22, r. 22-B3432
Bathing and toilet facilities shall be provided in accordance with the fixtures ratios established for each or both of them in Chapter 6 of the D.C. Housing Code (14 DCMR).
In each community residence facility employing more than three (3) full-time employees (including the Residence Director), toilet and lavatory facilities separate from the rooms used by residents shall be provided.
In each community residence facility with more than thirty (30) residents, when residents have the use of common living or eating space on floors other than floors on which their bedrooms are located, additional toilets and lavatories shall be provided on those floors in the proportion of (1) toilet and lavatory for each thirty (30) residents.
D.C. Mun. Regs. tit. 22, r. 22-B3432