Photo: Marine 69-71 · CC BY-SA 4.0Living in Mammoth, AZ: what to set up and who to call
The latest lead test reported by the Town of Mammoth water system, which supplies Mammoth, came in at 19.0 ppb (Jan 2024–Dec 2026), above the 15 ppb action level. Wired internet is thin in Mammoth: the FCC’s map has 57% of addresses able to get it.
I’m new in town
What to set up in Mammoth, 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.
Power comes from APS
APS (Arizona Public Service Co.), an investor-owned utility, serves 99.0% of Mammoth residents. Its homes paid an average of 17.0¢ per kWh in 2025, about $165 a month (its average across Arizona).
Start or move service: aps.com
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Town of Mammoth water system
The Town of Mammoth water system supplies almost all of Mammoth. It draws ground water and serves 1,181 people in all.
1 health-based violation reported to EPA in the five years to October 2026: a lead and copper treatment requirement (Lead and Copper Rule), beginning Dec 2025. 78% of the 7,966 systems serving 1,001–3,300 people had none.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2024–Dec 2026, was 19.0 ppb, above the 15 ppb action level that applied. That’s higher than 100% 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. AZ0411018.
4 home internet providers serve Mammoth
77% of 593 addresses can get 100/20 Mbps; 0% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| CenturyLink | DSL | 59% | 10/1 |
| T-Mobile | Fixed wireless | 74% | 100/20 |
| AT&T | Fixed wireless | 59% | 100/20 |
| CopperNet Systems | Fixed wireless | 3% | 400/100 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Mammoth’s trash rules yet
Pickup rules, the dump and recycling in Mammoth.
Where your child goes to school
Public school districts and the school path by grade.
Most of Mammoth (52%) is in Oracle Elementary District; parts are in Mammoth-San Manuel Unified District (48%).
C+School 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 Sep 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Sep 12, 2025.
Mammoth spans 2 ZIP codes
ZIP codes where Mammoth residents live, with the share of the town in each.
| ZIP | Post office name | Share of Mammoth | ZIP’s residents in Mammoth |
|---|---|---|---|
| 85618 | Mammoth, AZ | 99% | 84% |
| 85623 | Oracle, AZ | 1% | 0% |
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
Who supplies Mammoth’s drinking water, and has it had violations?
The Town of Mammoth water system (EPA ID AZ0411018). It reported 1 health-based violation to EPA in the five years to October 2026: a lead and copper treatment requirement (Lead and Copper Rule). 78% of systems its size had none. Its latest lead 90th percentile was 19.0 ppb (Jan 2024–Dec 2026), against a 15 ppb action level.
Who provides electricity in Mammoth?
APS (Arizona Public Service Co.), an investor-owned utility. Its homes paid about 17.0¢ per kWh in 2025 (EIA).
What internet providers serve Mammoth?
CenturyLink, T-Mobile, AT&T, CopperNet Systems (FCC, as of December 2025).
What ZIP codes are in Mammoth?
85618 (99%), 85623 (1%), by share of residents. Census 2020 ZIP Code Tabulation Areas.
What school district is Mammoth in?
Oracle Elementary District. Parts of the city are in Mammoth-San Manuel Unified District.
How do I register to vote in Mammoth?
In Arizona you can register online until 29 days before Election Day, in person until 29 days before Election Day, or by mail (postmarked 29 days before). Elections here are run by the Pinal County Recorder. Check your registration at my.arizona.vote.
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 Sep 12, 2025 (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.