Property tax in Lake County is ~ 1.25% of the transfer value. This figure may vary slightly based on the area you are purchasing in so if you want a better estimate contact the Lake County Assessors office at 707-263-2302
There will be a transfer tax that is typically paid by the seller and that rate is based on $1 per $1000 of purchase price.
Sales Tax in Lake County on general merchandise is 8.25%