Living in Sunny Slopes, CA: what to set up and who to call
Sunny Slopes has no town government of its own, so Mono County runs its elections and most services, and its children attend Mammoth Unified School District. Birchim Community Service District has a clean five-year EPA record, but its latest lead result, 5.2 ppb, was higher than 91% of similar systems’ (the action level is 15).
I’m new in town
What to set up in Sunny Slopes, 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 Sunny Slopes.
Power comes from Southern California Edison
Southern California Edison (Southern California Edison Co), an investor-owned utility, serves all of Sunny Slopes. 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 Birchim Community Service District
Birchim Community Service District supplies Sunny Slopes: about 95% of residents live in its service area. Utu Utu Gwaitu Paiute Tribe serves another 5%. It draws ground water and serves 150 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 77% of the 15,074 systems serving 101–500 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2021–Dec 2023, was 5.2 ppb, below the 15 ppb action level that applied. That’s higher than 91% of similar systems’ latest results.
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. CA2600501.
3 home internet providers serve Sunny Slopes
78% of 117 addresses can get 100/20 Mbps; 72% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Race Communications | Fiber | 71% | 1,000/1,000 |
| Frontier | DSL | 63% | 90/5 |
| Verizon | Fixed wireless | 56% | 300/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Sunny Slopes’ trash rules yet
Pickup rules, the dump and recycling in Sunny Slopes.
Where your child goes to school
Public school districts and the school path by grade.
Sunny Slopes is in Mammoth Unified School District.
Test scores and every school: see 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
Sunny Slopes is unincorporated, so Mono 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.
Sunny Slopes is in ZIP code 93546
ZIP codes where Sunny Slopes residents live, with the share of the town in each.
| ZIP | Post office name | Share of Sunny Slopes | ZIP’s residents in Sunny Slopes |
|---|---|---|---|
| 93546 | Mammoth Lakes, CA | 100% | 2% |
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 Sunny Slopes
Who supplies Sunny Slopes’ drinking water, and has it had violations?
Birchim Community Service District (EPA ID CA2600501). It reported no health-based violations to EPA in the five years to October 2026; 77% of systems its size had none. Its latest lead 90th percentile was 5.2 ppb (Jan 2021–Dec 2023), against a 15 ppb action level.
Who provides electricity in Sunny Slopes?
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 Sunny Slopes?
Race Communications, Frontier, Verizon (FCC, as of December 2025).
What ZIP codes are in Sunny Slopes?
93546. Census 2020 ZIP Code Tabulation Areas.
What school district is Sunny Slopes in?
Mammoth Unified School District.
How do I register to vote in Sunny Slopes?
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 Mono 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.