Antelope Hill Highway Bridge · Photo: Zandermw · CC BY-SA 4.0Living in Tacna, AZ: what to set up and who to call
Cs Mohawk Utility Company reported 14 health-based violations to EPA in the last five years: a surface water treatment requirement (Interim Enhanced Surface Water Treatment Rule) ×13, a bacteria testing requirement (Revised Total Coliform Rule). 77% of systems its size reported none. Tacna has no town government of its own, so Yuma County runs its elections and most services, and its children attend Antelope Union High School District.
I’m new in town
What to set up in Tacna, 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 Tacna.
Power comes from Wellton-Mohawk Irr & Drain Dist
Wellton-Mohawk Irr & Drain Dist (Wellton-Mohawk Irr & Drain Dist), a political subdivision utility, serves all of Tacna.
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Cs Mohawk Utility Company
Cs Mohawk Utility Company supplies Tacna: about 43% of residents live in its service area. About 57% of homes are outside any mapped community water system, most likely on private wells, which EPA doesn’t regulate. It draws surface water and serves 243 people in all.
14 health-based violations reported to EPA in the five years to October 2026: a surface water treatment requirement (Interim Enhanced Surface Water Treatment Rule) ×13, a bacteria testing requirement (Revised Total Coliform Rule), the latest beginning Jun 2026. 77% of the 15,074 systems serving 101–500 people had none.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2022–Dec 2024, was 4.3 ppb, below the 15 ppb action level that applied. That’s higher than 88% 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. AZ0414030.
2 home internet providers serve Tacna
100% of 285 addresses can get 100/20 Mbps; 100% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Sun Valley Broadband | Fixed wireless, Fiber | 100% | 500/50 |
| T-Mobile | Fixed wireless | 82% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Tacna’s trash rules yet
Pickup rules, the dump and recycling in Tacna.
Where your child goes to school
Public school districts and the school path by grade.
Tacna is in two districts that split the grades: Antelope Union High School District and Mohawk Valley Elementary 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
Tacna is unincorporated, so Yuma County is the local government.
Election office: FVAP local election office directory, updated Sep 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Sep 12, 2025.
Tacna spans 2 ZIP codes
ZIP codes where Tacna residents live, with the share of the town in each.
| ZIP | Post office name | Share of Tacna | ZIP’s residents in Tacna |
|---|---|---|---|
| 85352 | Tacna, AZ | 56% | 62% |
| 85356 | Wellton, AZ | 44% | 5% |
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 Tacna
Who supplies Tacna’s drinking water, and has it had violations?
Cs Mohawk Utility Company (EPA ID AZ0414030). It reported 14 health-based violations to EPA in the five years to October 2026: a surface water treatment requirement (Interim Enhanced Surface Water Treatment Rule) ×13, a bacteria testing requirement (Revised Total Coliform Rule). 77% of systems its size had none. Its latest lead 90th percentile was 4.3 ppb (Jan 2022–Dec 2024), against a 15 ppb action level.
Who provides electricity in Tacna?
Wellton-Mohawk Irr & Drain Dist (Wellton-Mohawk Irr & Drain Dist), a political subdivision utility.
What internet providers serve Tacna?
Sun Valley Broadband, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Tacna?
85352 (56%), 85356 (44%), by share of residents. Census 2020 ZIP Code Tabulation Areas.
What school district is Tacna in?
Antelope Union High School District and Mohawk Valley Elementary District.
How do I register to vote in Tacna?
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 Yuma 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.