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A3 is Contra Costa County's innovative approach to provide timely and appropriate mental and behavioral health crisis services to anyone, anywhere, at anytime in the county.

Emergency behavioral health support

If you or someone you know is experiencing a behavioral health crisis, call the A3 Miles Hall Crisis Call Center at


The Call Center operates 8 a.m. - 12:30 a.m. daily.

For support outside these hours:

  • Call 911 in an emergency
  • Adults: Call 988 or Text 'HOPE' to 20121
  • Under 18: 877-441-1089