California Code, Insurance Code - INS § 10089.20

The authority shall renew any policy of basic residential earthquake insurance, provided the authority receives payment of the applicable renewal premium on or before the expiration date stated in the policy. The authority shall nonrenew, rescind, or cancel a policy if the property is no longer covered by an underlying policy of residential property insurance. The policy issued by the authority shall not provide coverage in the event that there is no underlying policy of property insurance at the time of loss. In that case, any unearned premiums shall be returned to the policyholder on a pro rata basis.