US lawArizonaRegulationsTitle 18 — Environmental QualityChapter 4 — Department of Environmental Quality - Safe Drinking WaterR18-4-278R18-4-278R18-4-278. ReservedReservedLength: 2 wordsOfficial source Cite as Ariz. Admin. Code § R18-4-278R18-4-278. ReservedPreviousR18-4-277NextR18-4-279