This is a new area but generally if the resident state recognizes civil unions they allow divorces.
This is not a comprehensive answer and it is impossible to provide a meaningful response without a consultation. Call us for more information. 619.797.5456 www.mataelelaw.com
If you and your soon-to-be ex both live in California, you can dissolve the union in California; it's very much like getting a dissolution of marriage (divorce).