D.C. Mun. Regs. tit. 25, r. 25-G402
All procedure areas and instrument cleaning areas shall have floors, walls and ceilings constructed of smooth, nonabsorbent and easily cleanable material. Outer openings shall provide protection against contamination from dust and other contaminants.
All floors, floor coverings, walls, wall coverings, and ceilings shall be designed, constructed, and installed so they are smooth and easily cleanable, except that antislip floor coverings or applications may be used for safety reasons.
All facilities shall have a waiting area that is separate from the body art procedure area, and from the instrument cleaning, sterilization, and storage areas.
The floors in the restrooms and locker rooms that are next to showers or toilets, or any other wet areas, shall be constructed of smooth, durable, nonabsorbent, and easily cleanable material.
Every concrete, tile, ceramic, or vinyl floor installed in bathrooms, restrooms, locker rooms, and toilet rooms, which are next to showers or toilets, shall be covered at the junctures between the floor and the walls.
All material used to cover the junctures shall be fitted snugly to the floor and the walls so that they are water tight and there are no openings large enough to permit the entrance of vermin.
The material used in constructing the walls and ceilings must be joined along their edges so as to leave no open spaces or cracks.
Utility service lines and pipes shall not be unnecessarily exposed.
Exposed utility service lines and pipes shall be installed so they do not obstruct or prevent cleaning of the floors, walls, or ceilings.
Exposed horizontal utility service lines and pipes shall not be installed on the floor.
D.C. Mun. Regs. tit. 25, r. 25-G402