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 9/4/2009)

Statistics are estimates provided by the states.