Public Health - Always Working for a Safer and Healthier Washington Washington State Department of Health Division of Environmental HealthOffice of Drinking Water Source Water Protection WAC  Groundwater WAC 246-290-135 (2&3)  Sanitary control area  Susceptibility assessment  Wellhead protection areas (time of travel zones)  Contaminant inventory  Notification to contaminant source owner/operators, regulatory agencies, and emergency responders  Contingency plan  Update every two years 12
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