The city next week will be mailing out notices regarding a public hearing on Jan. 10 on proposed increases in water rates. Residential rates are proposed to increase by 7.75 percent for water used, plus an 8.75 percent hike in the fixed meter charge. The City Council, meeting in a workshop session Tuesday night regarding water rates, was told most of the “water commodity” rate increase reflects a pass-through increase from the San Diego County Water Authority, from where the city buys raw water for treatment in its municipal plant.