For information or questions related to water quality and treatment, consumer protection, hazardous materials, and waste management, please contact the environmental health services in your county of residence.

Napa County
Napa County Environmental Health Division
1195 Third Street, 2^nd Floor
Napa, CA 94559
Phone: (707) 253-4471
Hours: M–F 8 am–12 pm & 1 pm–4 pm
Website: Napa County EH

Solano County
Environmental Health Services, Solano County Department of Resource Management
675 Texas Street, Suite 5500
Fairfield, CA 94533
Office hours: M–F 8 am–12 pm & 1 pm–5 pm
Phone: (707) 784-6765
Website: Solano County EH

Yolo County
Yolo County Environmental Health Division
292 West Beamer Street
Woodland, CA 95695
Office hours: M–F 8 am–12 pm & 1 pm–4 pm
Phone: (530) 666-8646
Website: Yolo County EH

Marin County
Marin County Environmental Health Services
3501 Civic Center Drive, Suite 236
San Rafael, CA 94903
Hours: M–Th 8 am–4 pm
Phone: (415) 473-6907
Website: Marin County EH