Facing its largest seasonal algal bloom in 20 years, the Sweetwater Authority may need to buy water to address the problem. At its May 28 board meeting, the South Bay agency agreed to increase its budget for the year in case it must purchase more water to dilute the water supply. The agency says doing so would help mitigate changes to the water’s taste and odor caused by the algae. … For the past six months Sweetwater has been grappling with a number of pollutants in its main reservoir and has been using its water surplus to dilute the problem. Earlier this year, the authority transferred water to the Sweetwater Reservoir from Loveland Reservoir to lower levels of chemicals, known as PFAS, detected in the water. Now, in what they say is a separate issue, the agency would either use purchased water to dilute the algal bloom, or may also sell the purchased water to customers rather than diluting its own.