CSS provides the 24/7 CrisisLine @ 1-800-309-2131 or 988 in Alameda County. This page isn't monitored 24/7 & is not intended for crisis intervention CSS provides crisis & suicide prevention services in Alameda County CSS began 40 years ago as a 24-hour suicide prevention and crisis line. We now provide a variety of mental health services to a wide range of persons in varying degrees of crisis. We carry out our mission through several programs dedicated to saving lives and helping people struggling with personal issues. Over the course of a year we respond to more than 50,000 calls from Alameda County residents who need help on our crisis lines. Our services are free of charge to everyone, and a toll-free number is available throughout the county. A dedicated group of community volunteers staff the crisis lines every day and night of the year.