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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


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

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

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 Help Center’s knowledge base prior to submitting an inquiry. If submitting an inquiry, please provide as much detail as possible in your request. For questions related to retrieving data from OASIS, visit our OASIS Frequently Asked Questions.

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