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Policy and rules

Who sets the rules and what they cover. 2 items.

Policy and rulesWho manages groundwater in Sonoma CountyThree basins have approved groundwater sustainability plans: Sonoma Valley, Petaluma Valley and Santa Rosa Plain. Each has its own local agency.Updated Oct 11, 2026

Policy and rulesWho makes the water rules in Sonoma CountyState boards set drinking water and pollution rules. The county handles wells, septic and graywater permits. Your own utility handles your tap and your bill.