From Wazeopedia

Editor communities

California has two separate editor communities where we keep in touch and communicate about local editing issues: a Slack team which covers the northern and central portions of the state, and a Google+ community covering all of southern California. If you are actively editing in one (or both) of these areas, we'd welcome you to the appropriate group.

Northern/Central: PM an email address to one of the team administrators, so we can send an invite: tonestertm, citeman, or DwarfLord.

Southern: Go to Southern California Waze Editors to request admission.