Photo: Perfect Zero from Los Angeles, CA, US · CC BY 2.0Living in Mammoth Lakes, CA: what to set up and who to call
All of Mammoth Lakes gets its mail under one ZIP code, 93546. For emergencies, Mammoth Lakes is closest to Mammoth Hospital, 2 miles away.
I’m new in town
What to set up in Mammoth Lakes, 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 Mammoth Lakes.
Power comes from Southern California Edison
Southern California Edison (Southern California Edison Co), an investor-owned utility, serves all of Mammoth Lakes. 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 Mammoth Cwd water system
The Mammoth Cwd water system supplies almost all of Mammoth Lakes. It draws surface water and serves 8,234 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 80% of the 5,012 systems serving 3,301–10,000 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2024–Dec 2026, was 1.5 ppb, below the 15 ppb action level that applied. That’s higher than 59% 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. CA2610001.
5 home internet providers serve Mammoth Lakes
98% of 3,947 addresses can get 100/20 Mbps; 23% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Optimum | Cable | 97% | 940/35 |
| Frontier | DSL, Fiber | 69% | 7,000/7,000 |
| Verizon | Fixed wireless | 91% | 300/20 |
| T-Mobile | Fixed wireless | 61% | 100/20 |
| AT&T | Fixed wireless | 12% | 25/3 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
Trash and recycling in Mammoth Lakes
Pickup days, the drop-off and recycling in Mammoth Lakes, from the town’s own site.
We couldn’t find pickup days or drop-off hours. Check townofmammothlakes.ca.gov →
From townofmammothlakes.ca.gov, the town’s official site, checked Oct 21, 2026; pages dated 3/2/2026. Rules change: the town’s page is the last word. .
Where your child goes to school
Public school districts and the school path by grade.
Mammoth Lakes is in Mammoth 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.
Town hall and registering to vote
Who to call, and how to register.
Election office: FVAP local election office directory, updated Jul 2021; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Mammoth Lakes is in ZIP code 93546
ZIP codes where Mammoth Lakes residents live, with the share of the town in each.
| ZIP | Post office name | Share of Mammoth Lakes | ZIP’s residents in Mammoth Lakes |
|---|---|---|---|
| 93546 | Mammoth Lakes, CA | 100% | 84% |
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 Mammoth Lakes
Who supplies Mammoth Lakes’ drinking water, and has it had violations?
The Mammoth Cwd water system (EPA ID CA2610001). It reported no health-based violations to EPA in the five years to October 2026; 80% of systems its size had none. Its latest lead 90th percentile was 1.5 ppb (Jan 2024–Dec 2026), against a 15 ppb action level.
Who provides electricity in Mammoth Lakes?
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 Mammoth Lakes?
Optimum, Frontier, Verizon, T-Mobile, AT&T (FCC, as of December 2025).
What ZIP codes are in Mammoth Lakes?
93546. Census 2020 ZIP Code Tabulation Areas.
What school district is Mammoth Lakes in?
Mammoth Unified School District.
How do I register to vote in Mammoth Lakes?
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: Mammoth Lakes’ own website (townofmammothlakes.ca.gov), read Oct 21, 2026, pickup and drop-off facts extracted and checked against the page they came from.
- 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.