Dear Carolyn,
Insurers in California have the freedom to select their own underwriting (eligibility) standards for new business and renewals as long as the selected standards are objective, related to the risk of loss and applied consistently. If the insurer chooses to discontinue writing risks above a specified wildfire risk score, for example, they can non-renew homes located within those higher scores despite any mitigation efforts or participation in a Firewise community by the insured. They could choose to make an exception for homes that meet additional specified standards, but they don’t have to.
Additionally, to your particular point, many insurers and firefighters have opined that fire retardant and water extinguishing systems are often nullified by the high winds that are common during wildfire events.
I hope this answers your question,
Joel Laucher