An overview of the general cost of living index for Prosser, WA is displayed above for your reference. Residents in Prosser, WA enjoy a cost of living index of 92. This index is 21% lower than the Washington average, and 8% lower than the national average. The following categories are used when determining the cost of living index for any given city: health care (5%), transportation (9%), utilities (10%), groceries (13%), housing (30%), and goods/services (33%). Clearly, housing and goods/services make up the majority of the formula for calculating the cost of living index. Because of this, the general cost of living for any given area can be estimated by looking at the cost of everyday goods in that area. For those living in Prosser, WA, the average cost of goods and services is 15% lower than it is in Washington, and it is 10% lower than the national average.