This indicator measures the number of Basin-Boundary drinking water systems for which health authorities (Interior Health and Northern Health) had issued a drinking water advisory as of June 10, 2015. Drinking water advisories (“Water Quality Advisories” or “Boil Water Notices”) are issued by health authorities when there is concern over the safety of the water supply. For this report, June 10 was selected as a sample date because of its correlation with spring freshet, which tends to affect turbidity (cloudiness) in surface water sources, potentially challenging the effectiveness of water treatment systems (Emelko, Silins, Bladon & Stone, 2011). The list of active water quality advisories was gathered from Interior Health’s Water Notifications database. At the time of research, no water notifications were active for the portion of our region served by Northern Health.