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A DUI arrest anywhere in Pomona, Claremont, Diamond Bar, La Verne, or San Dimas is generally heard at the Pomona Courthouse, 400 Civic Center Plaza, in downtown Pomona. Some sources describe an older two-building arrangement, with a separate North building at 350 W. Mission Blvd. historically handling misdemeanor and traffic matters — but whether that building is still taking separate filings isn't something this page can confirm, so don't assume either address without checking your own citation or calling the clerk first. This corner of the East San Gabriel Valley runs from the historic Fairplex fairgrounds and Cal Poly Pomona through the foothill communities along the 10, 57, 71, and 60 freeways. Below: which agency probably wrote your report, who actually prosecutes a case out of this courthouse, the DMV deadline running on a completely separate clock, and what Ron does first once he's retained.
Pomona Courthouse — court & DMV details
Why your case is here
Five cities feed into this one courthouse: Pomona itself, Claremont, Diamond Bar, La Verne, and San Dimas. (A sourcing note, not a hedge on the facts: the county's own court locator is currently broken for both Pomona buildings — it repeats text meant for the El Monte Courthouse, naming cities nowhere near here — so this page relies on practitioner sources instead, and two of them independently name the same five cities.) Geographically it tracks: this is the historic Route 66 corridor where the 10, 57, 71, and 60 freeways converge at the base of the San Gabriel foothills, with Pomona's own Fairplex fairgrounds — home of the LA County Fair since 1922 — and Cal Poly Pomona anchoring the area. A freeway DUI stop through here most often comes from CHP's Baldwin Park Area office, which lists I-10, SR-57, SR-71, and SR-60 in its own coverage area; a stop closer to a division line could land with a different CHP office instead.
Three different policing setups across five cities
Three of the five cities police themselves, two don't. Pomona PD (490 W. Mission Blvd., where arrestees are also typically booked at the adjoining Pomona Jail), Claremont PD (570 W. Bonita Ave.), and La Verne PD (2061 Third St.) are each independent municipal departments. San Dimas and Diamond Bar have no police department of their own at all — both are Los Angeles County Sheriff's Department contract cities, San Dimas through the LASD's San Dimas Station and Diamond Bar through the Diamond Bar/Walnut Station, with bookings typically happening at whichever station took the arrest. Figuring out which of the five was actually involved is step one for Ron on every case here, since the report, the dashcam footage, and the booking paperwork all live with that specific agency, not the courthouse.
The 10-day DMV deadline
Nothing about the Pomona Courthouse touches your license directly — that's a separate track with the DMV, and it moves faster than the court does. This area's Administrative Per Se (APS) hearings used to run through the Covina Driver Safety Office; California now handles all of them by phone or video statewide instead, through the same 10-day window everyone gets: request one within 10 days of the arrest, or the suspension locks in on its own, independent of whatever happens at the courthouse. (833) 543-7703 is the number, and the sooner you call, the more room there is to actually fight it. How the DMV hearing works →
How Ron defends a DUI at the Pomona Courthouse
The first thing Ron sorts out is who actually made the arrest — Pomona, Claremont, or La Verne PD each run their own department, while San Dimas and Diamond Bar route through their LASD contract stations instead — and which building and department are actually handling the case, since that alone changes the courtroom, the calendar, and often the leverage in negotiations. Your own citation or arraignment paperwork is the authoritative answer on that; this page isn't. He then pulls the arrest report, any dashcam or body-camera footage, and the chemical test records, looking specifically for gaps in how the stop was justified, how the field sobriety tests were actually administered, and whether the breath or blood evidence was handled correctly — the kind of detail that turns into a reduced charge or a dismissal. He does not claim to be a certified specialist, and no result is ever guaranteed, but this is the same process he's run on San Gabriel Valley DUI cases since 2009 — directly, not routed through a paralegal or a call center.
Where will my Pomona, Claremont, Diamond Bar, La Verne, or San Dimas DUI be heard?
Who prosecutes a DUI from these cities?
Which police agency handled my arrest?
How do I protect my license?
← Back to Los Angeles County DUI Defense
Ron defends DUI cases across Southern California from his Irvine office, in English and Farsi — and works directly with you, not a call center.
Learn more about Ron Chini →