As Jane stated the tax rate is 1.1% plus bond measures.
If you are out looking at homes to purchase, when you find properties you really like, you can ask your agent what the last person was paying to get an idea of waht you taxes might be.
You can call the Riverside County Tax Assessors Office and they should be able to help you out as well.
Harold Sharpe - Broker
So Cal Homes Realty
California Department of Real Estate License # 01312992