CALIFORNIA FAMILY LAW
...Enforcement
......Interstate Enforcement (UIFSA)
.........Registration of Out-of-State Orders
............Procedure
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Out of state support or income-withholding orders may be registered in CA for enforcement.

Procedure for registering out of state support order.

Effect of registering out of state support order—enforcement but not modification.

Registration required if obligee wishes to modify order in Cal.

Obligor to be notified of registration of out of state or foreign support order.