The San Diego County Water Authority Board of Directors on Thursday adopted rate increases of 6.4 percent for untreated water and 5.9 percent for treated water in 2017, near the low end of projections and similar to the increases adopted by the Board of Directors for 2016.

Rates adopted by the board are primarily driven by higher costs from the Metropolitan Water District of Southern California, though they also incorporate higher costs for drought-proof water supplies from the Claude “Bud” Lewis Carlsbad Desalination Plant. They also were impacted by state-mandated reductions in water use that decreased sales more than earlier projections.