Living in South River, NM: what to set up and who to call
South River has no town government of its own, so San Juan County runs its elections and most services, and its children attend Aztec Municipal Schools. Southside Mutual Domestic Water has a clean five-year EPA record, but its latest lead result, 5.0 ppb, was higher than 92% of similar systems’ (the action level is 15).
I’m new in town
What to set up in South River, 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 South River.
Power comes from Jemez Mountains Elec Coop
Jemez Mountains Elec Coop (Jemez Mountains Elec Coop, Inc), a cooperative utility, serves all of South River. Its homes paid an average of 15.8¢ per kWh in 2025, about $90 a month (its average across New Mexico).
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Southside Mutual Domestic Water
Southside Mutual Domestic Water supplies South River: about 74% of residents live in its service area. Morningstar Water System serves another 26%. It buys treated surface water (EPA lists Aztec Domestic Water System as seller) and serves 1,609 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 78% of the 7,966 systems serving 1,001–3,300 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2023–Dec 2025, was 5.0 ppb, below the 15 ppb action level that applied. That’s higher than 92% 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. NM3509924.
6 home internet providers serve South River
83% of 856 addresses can get 100/20 Mbps; 0% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Xfinity | Cable | 70% | 1,200/35 |
| CenturyLink | DSL | 32% | 80/10 |
| Verizon | Fixed wireless | 88% | 300/20 |
| AT&T | Fixed wireless | 52% | 25/3 |
| T-Mobile | Fixed wireless | 25% | 100/20 |
| Visionary Broadband | Fixed wireless | 17% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have South River’s trash rules yet
Pickup rules, the dump and recycling in South River.
Where your child goes to school
Public school districts and the school path by grade.
Most of South River (77%) is in Aztec Municipal Schools; parts are in Farmington Municipal Schools (23%).
BSchool 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
South River is unincorporated, so San Juan County is the local government.
Election office: FVAP local election office directory, updated Aug 2019; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Aug 27, 2026.
South River is in ZIP code 87410
ZIP codes where South River residents live, with the share of the town in each.
| ZIP | Post office name | Share of South River | ZIP’s residents in South River |
|---|---|---|---|
| 87410 | Aztec, NM | 100% | 13% |
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 South River
Who supplies South River’s drinking water, and has it had violations?
Southside Mutual Domestic Water (EPA ID NM3509924). It reported no health-based violations to EPA in the five years to October 2026; 78% of systems its size had none. Its latest lead 90th percentile was 5.0 ppb (Jan 2023–Dec 2025), against a 15 ppb action level.
Who provides electricity in South River?
Jemez Mountains Elec Coop (Jemez Mountains Elec Coop, Inc), a cooperative utility. Its homes paid about 15.8¢ per kWh in 2025 (EIA).
What internet providers serve South River?
Xfinity, CenturyLink, Verizon, AT&T, T-Mobile, Visionary Broadband (FCC, as of December 2025).
What ZIP codes are in South River?
87410. Census 2020 ZIP Code Tabulation Areas.
What school district is South River in?
Aztec Municipal Schools. Parts of the city are in Farmington Municipal Schools.
How do I register to vote in South River?
In New Mexico you can register online until 28 days before Election Day, in person up to and including Election Day, or by mail (postmarked 28 days before). Elections here are run by the San Juan County Clerk. Check your registration at voterportal.servis.sos.state.nm.us.
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 Aug 27, 2026 (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.