The Nevada County Agriculture Department can identify a tick to determine
If it is the specie that can carry Lyme's disease. Carefully extract the tick, including the head, and place in a ziploc bag with a moist cotton ball. Partial ticks are difficult to id with any certainty.
The Placer County Public Health Laboratory can test ticks for Lyme disease. To test a tick, please contact the Placer County Laboratory at (530) 889-7205.
Tick FAQ by CDPH.pdf