How does CATT respond?
Response time
en route → on scene
—min
Call length
on scene → incident closed
—min
Total time
en route → incident closed
—min
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Who calls CATT out.
Most CATT dispatches originate from Law Enforcement — officers on scene with someone in mental-health crisis who shouldn't be heading to jail or the ED. The rest comes from patients, families, bystanders, and other healthcare providers.
— incidents with a recorded caller in the selected range
Where the calls happen.
Alameda County, by ZIP. Brighter = more incidents in the selected date range. Drag the slider at the top to watch the hot zones move year by year.
across the full date range · — incidents on the map
When CATT transports, where do clients go?
About — of CATT calls end with a transport. Most of the rest are stabilized in place — clients evaluated and connected to outpatient care or community supports.
For the calls that do end in transport, the destination depends on the clinical picture: psychiatric crises trend toward John George Psychiatric, while medical needs route to general hospitals like Kaiser, Highland, or Washington.
Top transport destinations
From eso_raw.catt_episodes.transported_to_destination —
updates with the timeline above.
What is CATT?
The Community Assessment and Transport Team is Alameda County's mobile mental-health crisis response, run by Bonita House. When someone is in crisis — at home, on a sidewalk, in a hospital ED — and 911 wouldn't be the right call, CATT goes.
Two clinicians per unit. No lights, no sirens. They assess, de-escalate, connect with care, and (when it's truly needed) transport to a higher level of service.
This is the data of every call they've taken — from — to —.
Where the calls come from.
Hayward, Oakland, San Leandro — the East Bay corridor accounts for the bulk of incidents. Smaller cities still get coverage; CATT is dispatched countywide.
Where calls take place.
The vast majority of crises happen at home. Schools, businesses, and public spaces fill out the rest — CATT meets people where they are.
When crisis happens.
Crisis doesn't keep business hours. Calls peak in the late afternoon and evening, and weekdays carry more volume than weekends — but the team responds at every hour of every day.
Calls by day of week
What happens at the scene.
Most CATT visits don't end with a hospital trip. The team often evaluates the client and connects them with outpatient care or community supports — keeping people out of emergency rooms and jails.
Most calls close without a hold.
Of the cases where a legal status is recorded, the overwhelming majority close without an involuntary hold. 5150s are the exception, not the rule — a sign of trust between team and community. Hover the smaller slice to see how often holds were placed on adults vs. minors.
The team behind the data.
Every row in this story is a person reached by another person at the worst moment of their day. The team has documented — clinical narratives, served — cities, and answered the call — times.
The data we're showing here was extracted nightly from CATT's operational systems (ESO and Microsoft Dataverse) and unified in a postgres warehouse, where it can support program reporting, quality review, and — eventually — predictive insight on who needs help and when.