The San Diego County Water Authority board of directors on Thursday voted to raise rates 6.4 percent for untreated water and 5.9 percent for treated water in 2017.

The water authority cited increasing expenses for imported water and the need to pass on higher costs for water from the desalination plant in Carlsbad. The water authority, which delivers water to 24 local agencies and districts that distribute to customers, also cited the impact of state-mandated conservation on its budget.