Living in San Mateo, NM: what to set up and who to call
An EPA health-based violation from 2016 is still open for the San Mateo Mdwca water system. San Mateo has no town government of its own, so Cibola County runs its elections and most services, and its children attend Grants-Cibola County Schools.
I’m new in town
What to set up in San Mateo, 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 San Mateo.
Power comes from Continental Divide El Coop
Continental Divide El Coop (Continental Divide El Coop Inc), a cooperative utility, serves all of San Mateo. Its homes paid an average of 16.9¢ per kWh in 2025, about $100 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 San Mateo Mdwca water system
The San Mateo Mdwca water system supplies San Mateo: about 94% of residents live in its service area. About 6% of homes are outside any mapped community water system, most likely on private wells, which EPA doesn’t regulate. It draws ground water and serves 182 people in all.
1 health-based violation reported to EPA in the five years to October 2026: a groundwater treatment requirement (Groundwater Rule), beginning Jun 2023. 77% of the 15,074 systems serving 101–500 people had none. 1 older violation is still open, since 2016: a groundwater treatment requirement (Groundwater Rule), per EPA’s records.
The latest lead result on file, the 90th percentile of homes sampled in Jan–Jun 2026, was 1.7 ppb, below the 15 ppb action level that applied. That’s higher than 67% 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. NM3525733.
Which providers serve San Mateo
This card will list the home internet providers the FCC’s National Broadband Map shows in San Mateo, the share of addresses that can get 100/20 Mbps and the share with fiber, with the map’s “as of” date.
Source to come: FCC Broadband Data Collection.
We don’t have San Mateo’s trash rules yet
Pickup rules, the dump and recycling in San Mateo.
Where your child goes to school
Public school districts and the school path by grade.
San Mateo is in Grants-Cibola County Schools.
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
San Mateo is unincorporated, so Cibola County is the local government.
Election office: FVAP local election office directory, updated Dec 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Aug 27, 2026.
San Mateo is in ZIP code 87020
ZIP codes where San Mateo residents live, with the share of the town in each.
| ZIP | Post office name | Share of San Mateo | ZIP’s residents in San Mateo |
|---|---|---|---|
| 87020 | Grants, NM | 100% | 1% |
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 San Mateo
Who supplies San Mateo’s drinking water, and has it had violations?
The San Mateo Mdwca water system (EPA ID NM3525733). It reported 1 health-based violation to EPA in the five years to October 2026: a groundwater treatment requirement (Groundwater Rule). 77% of systems its size had none. Its latest lead 90th percentile was 1.7 ppb (Jan–Jun 2026), against a 15 ppb action level.
Who provides electricity in San Mateo?
Continental Divide El Coop (Continental Divide El Coop Inc), a cooperative utility. Its homes paid about 16.9¢ per kWh in 2025 (EIA).
What ZIP codes are in San Mateo?
87020. Census 2020 ZIP Code Tabulation Areas.
What school district is San Mateo in?
Grants-Cibola County Schools.
How do I register to vote in San Mateo?
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 Cibola 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): pending.