D.C. Mun. Regs. tit. 22, r. 22-B3236
Each water supply and distribution system shall conform with the 1995 BOCA International Plumbing Code, District of Columbia Construction Code Supplement, Title 12 DCMR, and all other applicable District laws and regulations.
There shall be no cross-connection between the potable safe water supply and each water supply that is non-potable, or any source of pollution through which a safe supply might become contaminated.
Each sink, bathroom, bathtub, and shower shall have a continuous supply of hot and cold running water.
The temperature of hot water of each fixture that is used by each resident shall be automatically controlled and shall not exceed one-hundred and ten degrees Fahrenheit (110 [degrees] F) nor be less than ninety-five degrees Fahrenheit (95 [degrees] F).
Each water system shall also include a separate or booster supply at higher temperatures for kitchen, dish washing, and laundry uses.
Water pressure shall be at least fifteen (15) pounds per square inch (p.s.i.) on each floor during each period of peak demand.
Each drinking fountain that is accessible to a resident shall be installed in an area that is available for general resident use.
The facility shall establish procedures for the provision of a safe and functional supply of water for emergency use when the normal supply of water is lost.
D.C. Mun. Regs. tit. 22, r. 22-B3236