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Contingencies (Details) (GSWC, USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Aug. 31, 2003
Water Quality-Related Litigation
party
Dec. 31, 2012
Water Quality-Related Litigation
purveyor
Dec. 31, 2012
Condemnation of Properties
Dec. 31, 2012
Environmental Clean-Up and Remediation
Dec. 31, 2012
City of Claremont
Condemnation of Properties
customer
Dec. 31, 2012
Ojai FLOW
Condemnation of Properties
customer
Feb. 29, 2008
Santa Maria Valley Water Conservation District
Dec. 31, 2012
Santa Maria Valley Water Conservation District
acrefeet
Dec. 31, 2012
Santa Maria Valley Water Conservation District
Maximum
acrefeet
Contingencies                  
Number of other affected water purveyors that filed suit against those responsible for well contamination   2              
Number of parties deemed responsible for polluting groundwater 41                
Number of customers served through water systems         11,000 3,000      
Period during which no formal condemnation proceedings were filed     3 years            
Area of groundwater replenishment provided (in acre-feet)               10,000  
Period of severe water shortage condition               5 years  
Area per year to which groundwater production can be limited by the court (in acre-feet)                 10,248
Period considered for deriving average groundwater production               5 years  
Average groundwater production per year (in acre-feet)               10,140  
Percentage of the return flows generated from importation of state water project to be recaptured             45.00%    
Amount spent in clean-up and remediation activities       $ 3.5          
Amount paid by the State of California Underground Storage Tank Fund for clean-up and remediation of plant facilities       1.5          
Accrued liability for the estimated additional cost to complete the clean-up at the site       $ 1.2