A Water Quality Advisory has been issued for West Kelowna's Lakeview System.
It affects 4,000 connection, or 11,000 customers, including businesses and schools, in Lakeview Heights, Rose Valley, Boucherie Centre, Shannon Woods, Tallus Ridge, Shannon Lake and West Kelowna Business Park.
Residents living in the Westbank, West Kelowna Estates, Pritchard and Sunnyside Water Systems are not affected.
Increased turbidity in the Rose Valley Reservoir and Lakeview Water Supply System prompted the advisory.
"High concentrations of algae have begun breaking down in Rose Valley Reservoir resulting in above normal levels of turbidity," said a news release from the city "The City of West Kelowna has been able to control the algae and siphon and aerate the water for several weeks; but persistent hot, dry weather has caused the algae to grow exponentially, resulting in increased turbidity."
Vulnerable people such as children, the elderly, and those with a compromised immune system should boil water at least for one minute before using.
Last year, the Lakeview Water System was under a water quality advisory that laster 14 weeks.
Construction on a $49.4 multi-barrier treatment plant for the Lakeview System is expected to begin in the spring.