Moving to Ontario, CA? Here Are the Local Rules You Should Know

Ontario is a mid-sized city in San Bernardino County, California, with about 175000 residents. Like most cities its size, it has a set of local rules that may differ significantly from neighboring municipalities. Here is an overview of 118 ordinances across 26 categories that affect daily life in Ontario.

Accessory Structures

Tiny Homes: Foundation-built tiny homes qualify as ADUs under Gov Code 65852.2 in Ontario. Tiny homes on wheels are treated as RVs or park trailers and cannot be used as permanent dwellings on residential lots..

Also covered: Carport Rules (moderate), Garage Conversions (moderate), ADU Rules (permissive). See the full accessory structures guide for Ontario for details.

Animal Ordinances

Livestock: Ontario restricts livestock to agricultural and equine zones in the Development Code. Most livestock activity is in Ontario Ranch (New Model Colony).

Also covered: Wildlife Feeding (moderate), Pet Limits (moderate), Chickens & Livestock (strict). See the full animal ordinances guide for Ontario for details.

Noise Ordinances

Amplified Music & Events: Ontario Municipal Code section 5-29.13 requires a Police Chief permit to operate a loudspeaker or sound amplifier on public property, or at outdoor/indoor events over 100 people that are audible at the property line, and bars sound-amplifying equipment from being used between 8:00 p.m. and 8:00 a.m..

Also covered: Decibel Limits (moderate), Aircraft Noise (permissive), Leaf Blower Rules (moderate). See the full noise ordinances guide for Ontario for details.

Fence Regulations

Pool Barriers: Ontario requires any pool, spa, pond, or decorative water body deeper than 1.5 feet to be enclosed by a minimum 5-foot nonclimbable decorative fence or wall with self-closing gates. California's Swimming Pool Safety Act independently requires new or remodeled residential pools to have at least two drowning-prevention features, including a 60-inch enclosure that meets state standards..

Also covered: Material Restrictions (moderate), Fence Requirements (moderate), Approved Materials (strict). See the full fence regulations guide for Ontario for details.

Home Business

Customer Traffic Restrictions: Ontario home occupations cannot generate customer or delivery traffic beyond a normal household. Walk-in services like salons, medical, retail, and auto repair are not allowed as home occupations..

Also covered: Home Occupation Permits (moderate), Home Daycare (permissive), Cottage Food Operations (moderate). See the full home business guide for Ontario for details.

Short-Term Rentals

Permit Requirements: Ontario requires a Short-Term Rental Permit and a business license before any dwelling under 30 days is rented. Only the host's primary residence qualifies, and non-owner-occupied vacation rentals are prohibited..

Also covered: Occupancy Limits (moderate), Insurance Requirements (permissive), Night Caps (moderate). See the full short-term rentals guide for Ontario for details.

Building Safety

Lead Paint: Renovation that disturbs paint in a pre-1978 Ontario home must use an EPA Lead-Safe Certified firm under 40 CFR 745 and comply with California Title 17. Landlords also have lead disclosure duties..

Also covered: Scaffold & Sidewalk Shed (moderate), Elevator Maintenance (moderate), Pest Control (moderate). See the full building safety guide for Ontario for details.

Parking Rules

RV & Boat Parking: Since July 1, 2023, Ontario requires a displayed permit to park an oversized vehicle (including most RVs, boats, and trailers) on any public street. Permits are limited to 48 hours, no more than two per calendar month, are not issued consecutively, and the vehicle must be parked in front of the owner's own residence..

Also covered: EV Charging (permissive), Abandoned Vehicles (moderate), Overnight Parking (moderate). See the full parking rules guide for Ontario for details.

Solar Energy

Panel Permits: Ontario issues same-day online solar permits under AB 2188 and the statewide SolarAPP+ automated plan check, and new single-family homes must include solar under the 2019 Title 24 Solar Mandate..

Also covered: HOA Restrictions (permissive). See the full solar energy guide for Ontario for details.

Building Setbacks & Zoning

Setback Rules: Ontario single-family zones require a 20-foot front setback, 5-foot side yards (15-foot street side), and 20-foot rear setback under OMC Chapter 9 (Zoning), with reductions allowed for ADUs per Government Code 65852.2..

Also covered: Lot Coverage Limits (moderate), Structure Height Limits (moderate). See the full building setbacks & zoning guide for Ontario for details.

Environmental Rules

Erosion Control: Ontario requires active erosion control on all graded sites year-round under OMC Chapter 5 Article VI, with enhanced Best Management Practices from October 1 through April 30 during the rainy season..

Also covered: Stormwater Management (strict), Grading & Drainage (strict), Flood Zones (moderate). See the full environmental rules guide for Ontario for details.

Outdoor Lighting

Dark Sky Rules: Ontario regulates outdoor lighting under OMC Chapter 9, requiring shielded fixtures and color temperature limits to reduce glare toward homes and aircraft paths at ONT International Airport..

Also covered: Light Trespass (moderate). See the full outdoor lighting guide for Ontario for details.

Rental Property Rules

Rental Registration: Ontario does not maintain a citywide rental registry, but landlords must obtain a business license for rental activity under OMC Title 4 and comply with state rent cap disclosure rules..

Also covered: Just Cause Eviction (moderate), Rent Control (moderate). See the full rental property rules guide for Ontario for details.

Property Maintenance

Vacant Lot Maintenance: Ontario requires owners of vacant lots to clear weeds, trash, and fire hazards annually under OMC Chapter 30 and Fire Code Chapter 49 to reduce wildfire and blight risks..

Also covered: Garage Sale Rules (moderate), Property Blight (strict), Trash Bin Storage (moderate). See the full property maintenance guide for Ontario for details.

Sign Regulations

Political Signs: Ontario allows political signs on private property under First Amendment protections, with content-neutral limits on size, location, and removal timing under OMC Chapter 9..

Also covered: Holiday Displays (permissive), Garage Sale Signs (moderate). See the full sign regulations guide for Ontario for details.

Curfew Laws

Park Curfew: Ontario public parks are closed between 10:00 p.m. and 5:00 a.m., and entry during closed hours is an infraction under OMC Title 14..

Also covered: Juvenile Curfew (strict). See the full curfew laws guide for Ontario for details.

Soliciting & Door-to-Door

Solicitor Permits: Door-to-door commercial solicitors in Ontario must obtain a Peddler, Solicitor, and Itinerant Merchant permit from the City, submit to a background check, and display the permit badge while working..

Also covered: No-Knock Registry (strict). See the full soliciting & door-to-door guide for Ontario for details.

Cannabis Regulations

Dispensary Zoning: Ontario bans commercial cannabis retail, cultivation, manufacturing, and delivery storefronts citywide under OMC Chapter 9, while state law still permits pass-through delivery from licensed outside operators..

Also covered: Home Cultivation (strict). See the full cannabis regulations guide for Ontario for details.

Garage & Yard Sales

Garage Sale Permits: Ontario does not charge a garage sale permit fee, but limits each address to 3 sales per year of no more than 2 consecutive days under OMC Chapter 5..

HOA Rules

Assessment & Dues: Ontario HOA assessments follow Civil Code 5600 through 5740. Regular dues and special assessments are capped, must be disclosed in writing, and must follow strict collection and lien procedures..

Also covered: Board Procedures (moderate), Dispute Resolution (moderate), Architectural Review (moderate). See the full hoa rules guide for Ontario for details.

Landscaping Rules

Weed Ordinances: Ontario Municipal Code Chapter 6-9 (Weeds and Refuse Abatement) declares it unlawful and a public nuisance for any property to allow weeds, rubbish, refuse, or dirt to exist on it (Sec. 6-9.02).

Also covered: Rainwater Harvesting (permissive), Artificial Turf (permissive), Native Plants (moderate). See the full landscaping rules guide for Ontario for details.

Fire Regulations

Smoke Detectors: Ontario enforces California H and S 13113.7 requiring smoke alarms in every bedroom, outside sleeping areas, and on every floor. 10-year sealed-battery or hardwired units are required on replacement..

Also covered: Brush Clearance (moderate), Wildfire Zones (permissive), Backyard Fires (moderate). See the full fire regulations guide for Ontario for details.

Drone Rules

Recreational Drones: Recreational drone operators in Ontario must follow FAA 14 CFR Part 107 and Part 44809 rules and stay out of ONT airport Class C airspace without LAANC authorization..

Also covered: Commercial Drones (strict). See the full drone rules guide for Ontario for details.

Swimming Pools & Spas

Fencing Requirements: The City of Ontario Building Department requires every outdoor swimming pool, spa, or hot tub to be surrounded by a barrier at least 60 inches high with no more than a 2-inch gap at the bottom, self-closing and self-latching gates, and no climbable design features, in line with the California Swimming Pool Safety Act..

Also covered: Hot Tub Rules (moderate), Pool Permits (moderate), Above-Ground Pools (moderate). See the full swimming pools & spas guide for Ontario for details.

Trash & Recycling

Recycling Requirements: Ontario residents and businesses must separate recyclables and organics per California AB 341, AB 1826, and SB 1383, using blue recycling and green organics carts provided by Burrtec..

Also covered: Pickup Rules & Schedules (moderate), Bin Placement Rules (moderate), Bulk Item Disposal (permissive). See the full trash & recycling guide for Ontario for details.

Food Trucks & Mobile Vendors

Vending Zones: Under California SB 946, Ontario cannot ban sidewalk vendors citywide but regulates time, place, and manner through OMC Chapter 5, with no vending in parks during events or within 15 feet of curb cuts for ADA access..

Also covered: Food Truck Permits (moderate). See the full food trucks & mobile vendors guide for Ontario for details.

What to Do With This Information

Think of this as a map of the regulatory landscape in Ontario. For any rule that directly affects a decision you are making, click through to the full ordinance page for penalty details and exceptions, and confirm with the city if the stakes are high.