Logo - Sierra Social Services Inc. - Developmental Disabilities 


Positive Nonprofit Organization Supporting People with Developmental Disabilities 

Donations - Developmental Disabilities
Volunteers - Developmental Disabilities
Location - Developmental Disabilities


Our team appreciates your dedication to brightening the future for the disabled through your charitable contributions.


Be the change you wish to see in the world by lending a hand through any of our volunteer opportunities.

Hours of Operation:
Monday – Friday: 9:00 a.m. – 5:00 p.m.

Our Phone Lines Are Open 24 Hours 


Who We Are

Positively affect the lives of those with developmental disabilities by supporting our nonprofit organization. Sierra Social Services Inc. of Castro Valley, California, serves individuals and families with disabilities and similar needs by providing access to a full range of services that advance self-determination, dignity, and quality of life. Our associates specialize in supported living services and independent living skills training, recreational activities, advocate services, and provisions of related services and support. We are vendors paid for by the Regional Center in the State of California.
Learn More about Our Company  


Contact us today to help make a difference in the lives of those with developmental disabilities.