US lawArizonaRegulationsTitle 18 — Environmental QualityChapter 4 — Department of Environmental Quality - Safe Drinking WaterR18-4-257R18-4-257R18-4-257. ReservedReservedLength: 2 wordsOfficial source Cite as Ariz. Admin. Code § R18-4-257R18-4-257. ReservedPreviousR18-4-256NextR18-4-258