As a public water system (PWS), the City of Flagstaff is required under the Safe Drinking Water Act (SDWA) to monitor for potential contaminants — chemical and biological — to ensure that we are providing clean drinking water to citizens. View the 2016 Annual Water Quality Report on drinking water quality summarizing the results of this monitoring. Click for report. Please visit our webpage for additional reports and information: www.Flagstaff.AZ.gov/waterquality