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DUI / DWI Defense · San Bernardino County · Ontario

DUI Defense in Ontario, California

Ontario is Southern California's cargo gateway: Ontario International Airport—the 8th-busiest airport in the United States by freight—sits beside a wall of UPS and FedEx distribution hubs and connects the Ports of Los Angeles to the inland empire via Interstate 10, Interstate 15, and the surrounding logistics network. The city bridges supply chains and draws constant freeway traffic, overnight commercial movement, and transient populations that drive both local DUI enforcement and California Highway Patrol freeway activity. If you've been arrested for DUI in Ontario—on the I-10, the I-15, at a local checkpoint, or on Euclid Avenue downtown—Ron Chini defends your case from his Irvine office. He carries the prosecution at the Rancho Cucamonga courthouse and your DMV license hearing together, and that hearing must be requested within 10 days of the arrest or the DMV suspends your license automatically. Don't let that window close.

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Ron Chini, Esq.
Reviewed by Ron Chini, Esq. · CA State Bar No. 263308 · DUI defense attorney in Irvine, CA since 2009.
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Ontario's DUI enforcement landscape is shaped by its unique identity as the logistics and aviation hub of Southern California. The city experiences constant overnight freeway traffic on I-10 and I-15 (the primary east-west and north-south arterials connecting the San Gabriel Valley, Los Angeles, and the High Desert to the Port of Long Beach and inland distribution centers). Ontario International Airport—a major cargo facility with 24-hour operations—draws courier vehicles, commercial truck traffic, and service workers on unpredictable schedules. The city's commercial entertainment zones (Ontario Mills, the Toyota Arena, restaurants and bars along Euclid Avenue and in the Ontario Ranch development south of the airport) create local foot traffic and hospitality-related DUI scenarios. Together, these factors drive both Ontario Police Department checkpoints and California Highway Patrol freeway enforcement operations, making DUI arrests a routine part of the enforcement calendar.

How DUIs are policed in Ontario

Ontario has its own Ontario Police Department, which conducts DUI checkpoints, saturation patrols, and local-area enforcement. The department operates independently (not contracted to the San Bernardino County Sheriff) and runs checkpoint programs funded partly by California Office of Traffic Safety (OTS) grants. The California Highway Patrol's Inland Division patrols the I-10 and I-15 corridors running through Ontario, conducting freeway DUI enforcement, checkpoints, and special operations targeting impaired drivers on high-volume commercial corridors.

OTS Ranking and DUI Enforcement Volume: According to California's Office of Traffic Safety, Ontario's DUI arrest rate and alcohol-involved collision figures among comparable West Valley and Inland Empire cities will be verified before publication (DRAFT — verify Ontario's most recent OTS ranking, arrest count, and alcohol-collision victim count at ots.ca.gov). Ontario's position as a 24-hour logistics and aviation hub means DUI enforcement is conducted across all hours, not just peak evening periods. The combination of overnight freeway traffic, warehouse shift schedules, and airport operations creates a unique enforcement environment compared to traditional residential or entertainment-focused communities.

Ontario Police Department Checkpoints: The Ontario Police Department conducts regular DUI and driver's license checkpoints throughout the city, particularly on major arterials serving the airport, distribution centers, and commercial entertainment zones. Checkpoints target locations with documented DUI collision history and are typically announced in advance via press release (DRAFT — verify specific 2025/2026 checkpoint locations, dates, and coordination with OTS grant programs). The department also conducts saturation patrols on I-10 on-ramps and off-ramps, Euclid Avenue, and access roads to Ontario International Airport, especially during nighttime hours when impaired-driving risk is highest.

CHP Inland Division — Rancho Cucamonga Area Office: The California Highway Patrol's Inland Division covers all of San Bernardino County, with area offices in San Bernardino, Rancho Cucamonga, Victorville, and Barstow (DRAFT — verify confirm — the CHP Rancho Cucamonga Area office serves Ontario's I-10 and I-15 segments). CHP patrols the I-10 and I-15 freeways running through Ontario with regular DUI enforcement operations, checkpoints, and special enforcement unit (SEU) activities. The CHP's overnight and early-morning enforcement on the commercial corridors connecting the airport and distribution centers is particularly active, given the round-the-clock courier and warehouse traffic moving through the interchange.

Where an Ontario DUI case is heard

If you were arrested for DUI in Ontario, your case is heard at the Rancho Cucamonga Courthouse, 8303 Haven Avenue, Rancho Cucamonga, CA 91730 (DRAFT — verify this is the correct routing for Ontario; the Rancho Cucamonga courthouse serves the West Valley including Ontario, Fontana, Rialto, Upland, Chino, and Chino Hills). Your case is prosecuted by the San Bernardino County District Attorney (no city attorney prosecution). For courthouse details, judges, and case procedures, see our Rancho Cucamonga Courthouse page.

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Where will my Ontario DUI be heard?
At the Rancho Cucamonga Courthouse, 8303 Haven Avenue, Rancho Cucamonga, CA 91730 (DRAFT — verify)—the West Valley criminal courthouse for San Bernardino County, which serves Ontario, Fontana, Rialto, Upland, Chino, and Chino Hills. Your case is prosecuted by the San Bernardino County District Attorney.
Does the Ontario Police Department run DUI checkpoints?
Yes. The Ontario Police Department conducts regular DUI and driver's license checkpoints throughout the city, typically on major arterials serving the airport and distribution centers. Checkpoints are announced in advance via press release and target high-incident locations and peak enforcement times, particularly during nighttime hours.
Why is DUI enforcement so active on Ontario's freeways?
Ontario International Airport operates 24 hours a day, and the city's distribution and logistics economy runs overnight. The I-10 and I-15 freeways carry constant commercial truck traffic, courier vehicles, and airport-support personnel on non-standard schedules. This creates unique DUI enforcement opportunities for the CHP and Ontario Police, with particular focus on overnight and early-morning hours when impaired drivers are most common on high-speed freeway corridors.
Does the CHP patrol Ontario's freeways for DUI?
Yes. The California Highway Patrol's Inland Division—which covers all of San Bernardino County—patrols the I-10 and I-15 freeways running through Ontario. CHP conducts regular DUI checkpoints, saturation patrols, and special enforcement unit operations. Freeway DUI arrests can be more complex than local arrests because federal highway jurisdiction may apply.
Can Ron Chini defend my Ontario DUI from Irvine?
Yes. Ron Chini defends Ontario DUI cases from his Irvine office, handling both the criminal case at the Rancho Cucamonga courthouse and the DMV hearing together. He works directly with you in English or Farsi, offers a free consultation, and flexible payment plans are available. The Rancho Cucamonga courthouse is a straight shot up the I-10 from Irvine.

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Ron Chini, Esq.
Ron Chini, Esq.
DUI Defense Attorney · CA State Bar No. 263308

Ron defends DUI cases across Southern California from his Irvine office — and works directly with you, not a call center.

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Arrested for DUI in Ontario? Let's talk.

Ron Chini is an experienced DUI defense attorney; he does not claim to be a certified specialist, and no result is ever guaranteed. If you've been arrested for DUI in Ontario—on I-10, I-15, at an Ontario Police checkpoint, or anywhere in the city—Ron defends your case from his Irvine office. He handles both the court case at the Rancho Cucamonga courthouse and the DMV hearing together, offers a free consultation, and flexible payment plans are available. Call (888) 998-6938, 7 days a week.

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