Zane Grey Estate · Photo: Nathan Simmons · CC BY-SA 3.0Living in Altadena, CA: what to set up and who to call
Altadena has no town government of its own, so Los Angeles County runs its elections and most services, and its children attend Pasadena Unified School District. For a library card, the closest branch is Altadena Library District, 0.2 miles out.
I’m new in town
What to set up in Altadena, 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 Altadena.
Power comes from Southern California Edison
Southern California Edison (Southern California Edison Co), an investor-owned utility, serves all of Altadena. 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 Foothill Municipal Water Dist.
Foothill Municipal Water Dist. supplies Altadena: about 49% of residents live in its service area. Pasadena Water and Power serves another 19%. Lincoln Avenue Water Co. serves another 17%. Rubio Canon Land & Water Association serves another 11%. About 48% of homes are outside any mapped community water system, most likely on private wells, which EPA doesn’t regulate. It buys treated surface water (EPA lists Metropolitan Water Dist. of So. Cal. as seller) 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. CA1910032.
4 home internet providers serve Altadena
100% of 13,889 addresses can get 100/20 Mbps; 84% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Spectrum | Cable, Fiber | 98% | 1,000/50 |
| AT&T | Fiber, DSL, Fixed wireless | 97% | 5,000/5,000 |
| Verizon | Fixed wireless | 55% | 300/20 |
| T-Mobile | Fixed wireless | 53% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Altadena’s trash rules yet
Pickup rules, the dump and recycling in Altadena.
Where your child goes to school
Public school districts and the school path by grade.
Altadena is in Pasadena Unified School District.
BSchool gradeSee Schools →U.S. Department of Education, NCES Common Core of Data, 2024–25. Enrollment rules and registration are the district’s.
No town hall: the county runs things
Altadena is unincorporated, so Los Angeles County is the local government.
Election office: FVAP local election office directory, updated Sep 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Altadena spans 3 ZIP codes
ZIP codes where Altadena residents live, with the share of the town in each.
| ZIP | Post office name | Share of Altadena | ZIP’s residents in Altadena |
|---|---|---|---|
| 91001 | Altadena, CA | 84% | 99% |
| 91104 | Pasadena, CA | 15% | 18% |
| 91107 | Pasadena, CA | 1% | 2% |
91003 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.
ER: CMS hospital data. Library: IMLS Public Libraries Survey, FY2024.
Questions about living in Altadena
Who supplies Altadena’s drinking water, and has it had violations?
Foothill Municipal Water Dist. (EPA ID CA1910032). 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 Altadena?
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 Altadena?
Spectrum, AT&T, Verizon, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Altadena?
91001 (84%), 91104 (15%), 91107 (1%), by share of residents. Census 2020 ZIP Code Tabulation Areas.
What school district is Altadena in?
Pasadena Unified School District.
How do I register to vote in Altadena?
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: OpenStreetMap, Geofabrik extract of Oct 9, 2026. © OpenStreetMap contributors (ODbL).
- 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.