A plumbing system and hoses conveying water shall be constructed and repaired with approved materials according to the ICC International Plumbing Code/2000 as amended by the D.C. Plumbing Code Supplement/ 2003 (Title 12F of the District of Columbia Municipal Regulations), and subsequent amendments, hereinafter referred to as the "Plumbing Code".
A water filter shall be made of safe materials.
D.C. Mun. Regs. tit. 25, r. 25-B1400