Living in Callender, CA: what to set up and who to call
Woodland Park Mutual Water Co reported 13 health-based violations to EPA in the last five years: nitrate ×13. 78% of systems its size reported none. Callender has no town government of its own, so San Luis Obispo County runs its elections and most services, and its children attend Lucia Mar Unified School District.
I’m new in town
What to set up in Callender, 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 Callender.
Power comes from PG&E
PG&E (Pacific Gas & Electric Co.), an investor-owned utility, serves all of Callender. 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 Woodland Park Mutual Water Co
Woodland Park Mutual Water Co supplies Callender: about 36% of residents live in its service area. Callender Grove Mutual Water serves another 13%. Laguna Negra Mutual Water Co. serves another 8%. About 45% of homes are outside any mapped community water system, most likely on private wells, which EPA doesn’t regulate. It draws ground water and serves 538 people in all.
13 health-based violations reported to EPA in the five years to October 2026: nitrate ×13, the latest beginning Apr 2026. 78% of the 5,327 systems serving 501–1,000 people had none.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2024–Dec 2026, was 0.0 ppb, below the 15 ppb action level that applied. The highest in five years was 12.0 ppb. 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. CA4000506.
7 home internet providers serve Callender
100% of 429 addresses can get 100/20 Mbps; 28% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Spectrum | Cable, Fiber | 96% | 1,000/500 |
| Frontier | Fiber, DSL | 23% | 5,000/5,000 |
| Astound Broadband | Fiber | 5% | 5,000/5,000 |
| Surfnet Communications | Fixed wireless | 96% | 100/20 |
| Verizon | Fixed wireless | 59% | 300/20 |
| Peak WiFi | Fixed wireless | 5% | 100/100 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Callender’s trash rules yet
Pickup rules, the dump and recycling in Callender.
Where your child goes to school
Public school districts and the school path by grade.
Callender is in Lucia Mar Unified School District.
B+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
Callender is unincorporated, so San Luis Obispo County is the local government.
Election office: FVAP local election office directory, updated Sep 2020; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Callender is in ZIP code 93420
ZIP codes where Callender residents live, with the share of the town in each.
| ZIP | Post office name | Share of Callender | ZIP’s residents in Callender |
|---|---|---|---|
| 93420 | Arroyo Grande, CA | 100% | 4% |
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 Callender
Who supplies Callender’s drinking water, and has it had violations?
Woodland Park Mutual Water Co (EPA ID CA4000506). It reported 13 health-based violations to EPA in the five years to October 2026: nitrate ×13. 78% of systems its size had none. Its latest lead 90th percentile was 0.0 ppb (Jan 2024–Dec 2026), against a 15 ppb action level.
Who provides electricity in Callender?
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 Callender?
Spectrum, Frontier, Astound Broadband, Surfnet Communications, Verizon, Peak WiFi (FCC, as of December 2025).
What ZIP codes are in Callender?
93420. Census 2020 ZIP Code Tabulation Areas.
What school district is Callender in?
Lucia Mar Unified School District.
How do I register to vote in Callender?
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 Luis Obispo County Clerk-Elections. 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.