Photo: YonderStone · CC BY-SA 4.0Living in San Dimas, CA: what to set up and who to call
Tuesday is trash day in San Dimas; WM collects. Most homes in San Dimas have two wired internet choices, Spectrum and Frontier.
I’m new in town
What to set up in San Dimas, 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 San Dimas.
Power comes from Southern California Edison
Southern California Edison (Southern California Edison Co), an investor-owned utility, serves all of San Dimas. 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 Three Valleys Mwd water system
The Three Valleys Mwd water system supplies San Dimas: about 44% of residents live in its service area. About 56% of homes are outside any mapped community water system, most likely on private wells, which EPA doesn’t regulate. It draws surface water and serves 0 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 78% of the 11,392 systems serving <=100 people.
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. CA1910041.
5 home internet providers serve San Dimas
97% of 10,643 addresses can get 100/20 Mbps; 70% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Spectrum | Cable, Fiber | 96% | 1,000/1,000 |
| Frontier | Fiber, DSL | 72% | 7,000/7,000 |
| AT&T | Fixed wireless, DSL | 56% | 25/3 |
| Verizon | Fixed wireless | 74% | 300/20 |
| T-Mobile | Fixed wireless | 70% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
Trash day in San Dimas is Tuesday
Pickup days, the drop-off and recycling in San Dimas, from the town’s own site.
This month
- TrashEvery week
- Bulky itemsCall to book
From sandimasca.gov, files.sandimasca.gov, the town’s official site, checked Oct 21, 2026. 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.
Most of San Dimas (87%) is in Bonita Unified School District; parts are in Pomona Unified School District (5%) and Covina-Valley Unified School District (4%) and Charter Oak Unified School District (4%).
ASchool 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 Sep 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
San Dimas spans 2 ZIP codes
ZIP codes where San Dimas residents live, with the share of the town in each.
| ZIP | Post office name | Share of San Dimas | ZIP’s residents in San Dimas |
|---|---|---|---|
| 91773 | San Dimas, CA | 99% | 100% |
| 91740 | Glendora, CA | 1% | 1% |
A few homes fall in 91724.
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.
ER: CMS hospital data. Library: IMLS Public Libraries Survey, FY2024.
Questions about living in San Dimas
Who supplies San Dimas’ drinking water, and has it had violations?
The Three Valleys Mwd water system (EPA ID CA1910041). It reported no health-based violations to EPA in the five years to October 2026; 78% of systems its size had none.
Who provides electricity in San Dimas?
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 San Dimas?
Spectrum, Frontier, AT&T, Verizon, T-Mobile (FCC, as of December 2025).
What ZIP codes are in San Dimas?
91773 (99%), 91740 (1%), by share of residents. Census 2020 ZIP Code Tabulation Areas.
What school district is San Dimas in?
Bonita Unified School District. Parts of the city are in Pomona Unified School District and Covina-Valley Unified School District and Charter Oak Unified School District.
How do I register to vote in San Dimas?
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 Los Angeles Registrar-Recorder County Clerk. 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: San Dimas’ own website (sandimasca.gov, files.sandimasca.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.