For information on communicable disease investigations and surveillance in your community, please contact the communicable disease program in your county of residence.

Napa County
Napa County Communicable Disease
2751 Napa Valley Corporate Drive, Building B
Napa, CA 94558
Hours: M–F 8 am–12 pm & 1 pm–5 pm
Phone: (707) 253-4231
Website: Napa County CD


Solano County
Solano County Communicable Disease
275 Beck Avenue, MS 5-240
Fairfield, CA 94533
Hours: M–F 8 am–12 pm & 1 pm–5 pm
Phone (general): (707) 784-8001
Phone (for providers): (707) 784-8005
Website: Solano County CD

Yolo County
Yolo County Health and Human Services Agency, Communicable Diseases
137 N Cottonwood Street
Woodland, CA 95695
Hours: M–F 8 am–5 pm
Phone: (530) 666-8645
Website: Yolo County CD

Marin County
Marin County Communicable Disease Prevention and Control
3240 Kerner Boulevard
San Rafael, CA 94901
Hours: M–F 9 am–5 pm
Phone: (415) 473-4163
Website: Marin County CD


Mendocino County
Mendocino County Communicable Disease Unit
HHSA Public Health
1120 South Dora Street
Ukiah, CA 95482
Phone: (707) 472-2717
Website: Mendocino County CD