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Our Mailing Address
California ISO
P.O. Box 639014
Folsom, CA 95630
Folsom campus
250 Outcropping Way, 95630
Main telephone number: (916) 351-4400
Security telephone number: (916) 351-2303

Contact us

Our business hours are Monday through Friday from 8 a.m. to 5 p.m. To speak to a representative during business hours, please contact the department below that can best address your inquiry:


Customer Service
(916) 608-7320 

Human Resources
(916) 608-7000 

Media contact

Employment verification

Finance and Accounting
(916) 608-5937 


Tours & Speaker requests
Visit our web page for details
Currently offering virtual orientation only

System access or technical issues
(916) 351-2309 or (888) 889-0450

Service Desk for RC West participants only
Local number: (916) 538-5722
Toll-free number: (833) 888-9378


Use the form below to contact the ISO

A customer service specialist will respond to your inquiry.  

Please review our Tips for Asking Questions of the ISO prior to submitting the form to find out how to get a timely and useful response. For questions related to retrieving data from OASIS, visit our OASIS Frequently Asked Questions.

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