Photo: Originally uploaded by Rockero (Transferred by JaumeBG) · Public domainLiving in Ontario, CA: what to set up and who to call
Ontario spans 3 ZIP codes; 91761 holds the most residents (34%). Trains stop in Ontario, at East Ontario.
I’m new in town
What to set up in Ontario, and who provides it. Tap an answer for the details and where they come from.
Power, water and internet
Who to call to start service at a new address in Ontario.
Power comes from Southern California Edison
Southern California Edison (Southern California Edison Co), an investor-owned utility, serves all of Ontario. Its homes paid an average of 31.5¢ per kWh in 2025, about $149 a month (its average across California, for customers on its standard service). California lets you buy power from another supplier; 30% of Southern California Edison’s home customers do, and Southern California Edison still delivers it.
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Ontario Municipal Utilities Company
Ontario Municipal Utilities Company supplies almost all of Ontario. It buys treated surface water (EPA lists Jurupa Community Sd and Chino Basin Desalter Auth. - Desalter 2 and Water Facilities Authority-Jpa and City of Chino and Cucamonga Valley Water District as sellers) and serves 185,010 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 86% of the 332 systems serving 100,001–250,000 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2022–Dec 2024, was 0.6 ppb, below the 15 ppb action level that applied. That’s lower than 65% of similar systems’ latest results.
The system’s full record: EPA ECHO report
EPA SDWIS via Envirofacts (violations pulled Oct 9, 2026) and ECHO (lead samples, 2026Q3); service area: EPA Community Water System Service Area Boundaries v3.0. Violations are counted by the start of their compliance period. CA3610034.
6 home internet providers serve Ontario
98% of 41,799 addresses can get 100/20 Mbps; 80% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Spectrum | Cable, Fiber | 96% | 1,000/500 |
| Frontier | Fiber, DSL | 80% | 7,000/7,000 |
| AT&T | Fixed wireless, DSL | 43% | 25/3 |
| Inyo Networks | Fiber | 11% | 1,000/1,000 |
| Verizon | Fixed wireless | 62% | 300/20 |
| T-Mobile | Fixed wireless | 50% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
Trash day in Ontario depends on your street
Pickup days, the drop-off and recycling in Ontario, from the town’s own site.
Your pickup week
- TrashEvery week, on your street’s dayLook up your day on ontarioca.gov
- RecyclingEvery week, same day as trash
- Bulky itemsCall to book
Household Hazardous Waste (HHW) Facility
1430 S. Cucamonga Avenue, Ontario, CA 91761
- Fri9 am–2 pm
- Sat9 am–2 pm
Accepted at the curb
- Plastic & Glass
- Rigid plastic containers
- Empty glass bottles and jars
- Metal & aluminum
- Metal beverages & food cans
- Aerosol cans
- Clean aluminum pans and foil
- Mixed dry paper
- Clean paper
- Magazines
- Newspapers
- Cardboard
- Junk mail
- Styrofoam
From ontarioca.gov, the town’s official site, checked Oct 21, 2026; pages dated January 1, 2022. Rules change: the town’s page is the last word. .
Where your child goes to school
Public school districts and the school path by grade.
Ontario is in Chaffey Joint Union High School District; parts are in Ontario-Montclair School District (35%) and Mountain View Elementary School District (26%) and Cucamonga Elementary School District (23%) and Chino Valley Unified School District (16%).
B−School gradeSee Schools →U.S. Department of Education, NCES Common Core of Data, 2024–25. Enrollment rules and registration are the district’s.
Town hall and registering to vote
Who to call, and how to register.
Election office: FVAP local election office directory, updated Jul 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Ontario spans 3 ZIP codes
ZIP codes where Ontario residents live, with the share of the town in each.
| ZIP | Post office name | Share of Ontario | ZIP’s residents in Ontario |
|---|---|---|---|
| 91761 | Ontario, CA | 34% | 100% |
| 91762 | Ontario, CA | 34% | 95% |
| 91764 | Ontario, CA | 32% | 100% |
91758 is P.O. box or single-organization ZIP with no homes.
Census 2020 ZIP Code Tabulation Areas, by census block; post office names: GeoNames (CC BY 4.0). ZIPs created since 2020 are missing.
Getting around, the ER and the library
One line each; the subject pages have the rest.
Train: OpenStreetMap (© OpenStreetMap contributors). ER: CMS hospital data. Library: IMLS Public Libraries Survey, FY2024.
Questions about living in Ontario
Who supplies Ontario’s drinking water, and has it had violations?
Ontario Municipal Utilities Company (EPA ID CA3610034). It reported no health-based violations to EPA in the five years to October 2026; 86% of systems its size had none. Its latest lead 90th percentile was 0.6 ppb (Jan 2022–Dec 2024), against a 15 ppb action level.
Who provides electricity in Ontario?
Southern California Edison (Southern California Edison Co), an investor-owned utility. Its homes paid about 31.5¢ per kWh in 2025 (EIA).
What internet providers serve Ontario?
Spectrum, Frontier, AT&T, Inyo Networks, Verizon, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Ontario?
91761 (34%), 91762 (34%), 91764 (32%), by share of residents. Census 2020 ZIP Code Tabulation Areas.
What school district is Ontario in?
Chaffey Joint Union High School District. Parts of the city are in Ontario-Montclair School District and Mountain View Elementary School District and Cucamonga Elementary School District and Chino Valley Unified School District.
How do I register to vote in Ontario?
In California you can register online until 15 days before Election Day, in person up to and including Election Day, or by mail (postmarked 15 days before). Elections here are run by the San Bernardino Registrar of Voters. Check your registration at voterstatus.sos.ca.gov.
Sources & dates
Every answer above names its source. Here they are with their dates.
- Water: EPA SDWIS (Envirofacts, pulled Oct 9, 2026), ECHO SDWA 2026Q3, EPA CWS Service Area Boundaries v3.0.
- Power: HIFLD Electric Retail Service Territories (map Aug 2023); EIA-861 final 2025.
- Trash: Ontario’s own website (ontarioca.gov), read Oct 21, 2026, pickup and drop-off facts extracted and checked against the page they came from.
- ZIP codes: Census 2020 ZCTA relationship files; GeoNames postal codes (CC BY 4.0).
- Schools: NCES Common Core of Data, 2024–25.
- Registration: vote.gov, updated Nov 18, 2024 (read Oct 10, 2026). Official sites and area codes: Wikidata.
- Election office: FVAP local election office directory (fetched Oct 10, 2026; each record dated), EAC EAVS 2024 jurisdictions; registration and lookup links from vote.gov’s state data, checked Oct 10, 2026.
- Internet: FCC National Broadband Map, as of December 2025.