D.C. Mun. Regs. tit. 25-B, § 1304
1304.1 A nondrinking water or nonpotable water supply may be used only if its use is approved by the Department.
1304.2 Nondrinking water may be used for purposes unrelated to food processing including, but not limited to, air conditioning, nonfood equipment cooling, fire protection, irrigation, plant and equipment cleanup, and other sanitary purposes.
SOURCE: Final Rulemaking published at 56 DCR 5245 (July 3, 2009).