James H. and Frances E. Laughlin House · Photo: Sanfranman59 · CC BY-SA 3.0Living in Windsor, CA: what to set up and who to call
Windsor spans 2 ZIP codes; 95492 holds the most residents (98%). Trains stop in Windsor.
I’m new in town
What to set up in Windsor, 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 Windsor.
Power comes from PG&E
PG&E (Pacific Gas & Electric Co.), an investor-owned utility, serves all of Windsor. 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 Town of Windsor water system
The Town of Windsor water system supplies almost all of Windsor. It draws ground water (EPA lists Sonoma County Water Agency as seller) and serves 25,561 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 83% of the 3,525 systems serving 10,001–50,000 people.
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. CA4910017.
5 home internet providers serve Windsor
99% of 8,749 addresses can get 100/20 Mbps; 0% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Xfinity | Cable, Fiber | 96% | 2,000/250 |
| AT&T | DSL, Fixed wireless, Fiber | 90% | 75/20 |
| Verizon | Fixed wireless | 47% | 300/20 |
| T-Mobile | Fixed wireless | 43% | 100/20 |
| Kwikbit | Fixed wireless | 4% | 1,000/1,000 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Windsor’s trash rules yet
Pickup rules, the dump and recycling in Windsor.
Where your child goes to school
Public school districts and the school path by grade.
Most of Windsor (89%) is in Windsor Unified School District; parts are in Mark West Union Elementary School District (6%) and Santa Rosa High School District (6%).
BSchool 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 Jun 2026; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Windsor spans 2 ZIP codes
ZIP codes where Windsor residents live, with the share of the town in each.
| ZIP | Post office name | Share of Windsor | ZIP’s residents in Windsor |
|---|---|---|---|
| 95492 | Windsor, CA | 98% | 93% |
| 95403 | Santa Rosa, CA | 2% | 1% |
A few homes fall in 95448, 95436.
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 Windsor
Who supplies Windsor’s drinking water, and has it had violations?
The Town of Windsor water system (EPA ID CA4910017). It reported no health-based violations to EPA in the five years to October 2026; 83% 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 Windsor?
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 Windsor?
Xfinity, AT&T, Verizon, T-Mobile, Kwikbit (FCC, as of December 2025).
What ZIP codes are in Windsor?
95492 (98%), 95403 (2%), by share of residents. Census 2020 ZIP Code Tabulation Areas.
What school district is Windsor in?
Windsor Unified School District. Parts of the city are in Mark West Union Elementary School District and Santa Rosa High School District.
How do I register to vote in Windsor?
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 Sonoma County 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.