A general overview of the cost of living index for Petaluma, CA is displayed above. In Petaluma, CA, the overall cost of living index is 160, which is 16% higher than the California average and 60% higher than the U.S. average. The following categories are used to calculate the overall cost of living index: goods/services (33%), housing (30%), groceries (13%), utilities (10%), transportation (9%) and health care (5%). From the list, it is clear that the categories of goods/services and housing are responsible for the largest portions of the overall cost of living index. As a general rule, everyday goods and services provide an accurate measure of the general cost of goods in any given city. In the case of Petaluma, CA, the city's goods and services are 17% higher than the California average and 29% higher than the U.S. average.