Drinking Water: Call the State Department of Health Services, Drinking Water Field Operations. The phone number for their Santa Rosa office is 707-576-2145.
Creeks/Rivers Water: Call the California Regional Water Quality Control Board. The phone number for their North Coast Region office in Santa Rosa is 707-576-2220.
Private Well Water: Call the Sonoma County Permit and Resource Management Department at 707-565-1900.