D.C. Mun. Regs. tit. 21, § 1154
1154.1 All ground waters shall be classified as Class G1 until enough information that warrants a different classification is provided to or obtained by the Director and evaluated.
SOURCE: Final Rulemaking published at 40 DCR 4203, 4205 (July 2, 1993); renumbered by Final Rulemaking published at 41 DCR 1075 (March 4, 1994).