Looks like CA employers are required to withhold CASDI:
"Employers must withhold 1.1% of their employees’ gross wages for CASDI tax. The wage base limit is $145,600 per employee, per calendar year, and the maximum amount that can be withheld for each employee is $1,601.60."
https://www.adp.com/resources/articles-and-insights/articles/c/casdi-tax.aspx#p2