Cal. Insurance Code § 676

After a policy specified in Section 675 has been in effect for 60 days, or, if the policy is a renewal, effective immediately, no notice of cancellation shall be effective unless it is based on the occurrence, after the effective date of the policy, of one or more of the following: (a) Nonpayment of premium, including nonpayment of any additional premiums, calculated in accordance with the current rating manual of the insurer, justified by a physical change in the insured property or a change in its occupancy or use. (b) Conviction of the named insured of a crime having as one of its necessary elements an act increasing any hazard insured against. (c) Discovery of fraud or material misrepresentation by either of the following: (1) The insured or his or her representative in obtaining the insurance. (2) The named insured or his or her representative in pursuing a claim under the policy. (d) Discovery of grossly negligent acts or omissions by the insured or his or her representative substantially increasing any of the hazards insured against. (e) Physical changes in the insured property which result in the property becoming uninsurable.