The first step would be to see what services he can "patch" into his home. This could include Meals-On-Wheels. He may qualify for In-Home Supportive Services (IHSS) which could offer some hours of help during the day, but not 24/7. Call In-Home Supportive Services (IHSS)
(707) 565-5900 for more information.
Some residential care facilities MAY take him at a lower rate, but there are very few in the county, and few vacancies. The average cost of a care home is around $3500 a month.