I googled this for you:

CA W-2 hsa wages income

And found this for you: https://sco.ca.gov/ppsd_empinfo_form_w2.html

You might want to bookmark that site, if you have CA returns.

2020 Form W-2 Wage and Tax Statement FAQs

Frequently Asked Questions Regarding Form W-2

"CA taxpayers cannot deduct contributions to federal HSA from their California Wages.  It is not excluded as income and is added to the taxpayers CA wages."