The public is welcome to drop off water samples and ticks for testing at the locations below. A completed requisition and form of payment must be provided at the time of submission.

Laboratory (Solano County)
Napa-Solano-Yolo-Marin County Public Health Laboratory
2201 Courage Drive, MS 9-200
Fairfield, CA 94533
Hours: M–F 8 am–12 pm & 1 pm–4:45 pm
Phone: (707) 784-4410
Fax: (707) 423-1979

Napa County
Napa County Environmental Health
2751 Napa Valley Corporate Drive
Napa, CA 94558
Drop-off hours: M, W, Th, F 8 am–10:30 am & T 8 am–9 am
Phone: (707) 253-4270

Yolo County
Yolo County Environmental Health
292 W. Beamer St
Woodland, CA 95695
Drop-off hours: M–F 8 am–3 pm
Phone: (530) 666-8646

Marin County*
*Please no tick drop-offs. All ticks should be mailed directly to the laboratory*
Marin Health and Wellness Campus
3240 Kerner Boulevard
San Rafael, CA 94901
Drop-off hours: M–F 9 am–12 pm & 1 pm–1:30 pm 
Phone: (415) 473-4163