California

Statistics
Year Fracing Began: 
1970(s)
Types of Wells Fraced: 
Natural Gas
Types of Wells Fraced: 
Oil
Number of Wells Fraced Annually: 
500
Number of Wells Fraced Total: 
15,000*
Percentage of Wells Fraced: 
15%
Harm to Groundwater: 
None
(updated 8/25/2011)

Statistics are estimates provided by the states for the calendar year ending 12/31/2010 *Currently, California does not issue permits specifically for hydraulically fracturing; therefore, this is an estimated value.