Living in Alum Rock, CA: what to set up and who to call
Alum Rock has no town government of its own, so Santa Clara County runs its elections and most services, and its children attend East Side Union High School District. San Jose Water reported one health-based violation to EPA in the last five years: a surface water treatment requirement (Surface Water Treatment Rule), beginning Jun 2023.
I’m new in town
What to set up in Alum Rock, 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 Alum Rock.
Power comes from PG&E
PG&E (Pacific Gas & Electric Co.), an investor-owned utility, serves all of Alum Rock. Its homes paid an average of 37.5¢ per kWh in 2025, about $174 a month (its average across California, for customers on its standard service). California lets you buy power from another supplier; 66% of PG&E’s home customers do, and PG&E still delivers it.
Start or move service: pgecorp.com
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from San Jose Water
San Jose Water supplies Alum Rock: about 50% of residents live in its service area. About 50% of homes are outside any mapped community water system, most likely on private wells, which EPA doesn’t regulate. It draws surface water (EPA lists City of Cupertino and Santa Clara Valley Water District as sellers) and serves 1,039,920 people in all.
1 health-based violation reported to EPA in the five years to October 2026: a surface water treatment requirement (Surface Water Treatment Rule), beginning Jun 2023. 82% of the 27 systems serving more than 1,000,000 people had none.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2023–Dec 2025, was 0.0 ppb, below the 15 ppb action level that applied. Results below detection are reported as 0, so 0 doesn’t mean no lead at any tap.
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. CA4310011.
8 home internet providers serve Alum Rock
100% of 2,470 addresses can get 100/20 Mbps; 97% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Xfinity | Cable | 100% | 2,000/2,000 |
| AT&T | Fiber, DSL, Fixed wireless | 97% | 5,000/5,000 |
| Sonic Telecom | Fiber | 79% | 10,000/10,000 |
| Sail Internet | Fixed wireless | 99% | 800/160 |
| Etheric Networks | Fixed wireless | 99% | 250/100 |
| Ridge Wireless | Fixed wireless | 91% | 100/60 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
The nearest public drop-off is 2 miles away
Pickup rules, the dump and recycling in Alum Rock.
Household Hazardous Waste Facility
· run by County of Santa Clara
This isn’t Alum Rock’s own facility. Whether Alum Rock residents may use it is the town’s rule: check the town’s office.
OpenStreetMap, as of Oct 9, 2026. © OpenStreetMap contributors.
Where your child goes to school
Public school districts and the school path by grade.
Alum Rock is in two districts that split the grades: East Side Union High School District and Alum Rock Union Elementary School District.
C+School 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
Alum Rock is unincorporated, so Santa Clara County is the local government.
Election office: FVAP local election office directory, updated Jul 2021; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Alum Rock is in ZIP code 95127
ZIP codes where Alum Rock residents live, with the share of the town in each.
| ZIP | Post office name | Share of Alum Rock | ZIP’s residents in Alum Rock |
|---|---|---|---|
| 95127 | San Jose, CA | 100% | 19% |
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 Alum Rock
Who supplies Alum Rock’s drinking water, and has it had violations?
San Jose Water (EPA ID CA4310011). It reported 1 health-based violation to EPA in the five years to October 2026: a surface water treatment requirement (Surface Water Treatment Rule). 82% of systems its size had none. Its latest lead 90th percentile was 0.0 ppb (Jan 2023–Dec 2025), against a 15 ppb action level.
Who provides electricity in Alum Rock?
PG&E (Pacific Gas & Electric Co.), an investor-owned utility. Its homes paid about 37.5¢ per kWh in 2025 (EIA).
What internet providers serve Alum Rock?
Xfinity, AT&T, Sonic Telecom, Sail Internet, Etheric Networks, Ridge Wireless (FCC, as of December 2025).
What ZIP codes are in Alum Rock?
95127. Census 2020 ZIP Code Tabulation Areas.
What school district is Alum Rock in?
East Side Union High School District and Alum Rock Union Elementary School District. Parts of the city are in Mount Pleasant Elementary School District.
How do I register to vote in Alum Rock?
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 Santa Clara 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: 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.