Photo: Williamborg 18:11, 24 May 2008 (UTC) · Public domainLiving in Mattawa, WA: what to set up and who to call
The City of Mattawa water system reported one health-based violation to EPA in the last five years: a bacteria testing requirement (Revised Total Coliform Rule), beginning Jun 2024. Power in Mattawa comes from PUD No 2 of Grant County, a political subdivision utility rather than a private company.
I’m new in town
What to set up in Mattawa, 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 Mattawa.
Power comes from PUD No 2 of Grant County
PUD No 2 of Grant County (PUD No 2 of Grant County - (WA)), a political subdivision utility, serves all of Mattawa. Its homes paid an average of 6.2¢ per kWh in 2025, about $101 a month (its average across Washington).
Start or move service: grantpud.org · (509) 754-0500
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from City of Mattawa water system
The City of Mattawa water system supplies almost all of Mattawa. It draws ground water and serves 5,370 people in all.
1 health-based violation reported to EPA in the five years to October 2026: a bacteria testing requirement (Revised Total Coliform Rule), beginning Jun 2024. 80% of the 5,012 systems serving 3,301–10,000 people had none.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2021–Dec 2023, was 0.0 ppb, below the 15 ppb action level that applied. Results below detection are reported as 0, so 0 doesn’t mean no lead at any tap.
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. WA5352000.
4 home internet providers serve Mattawa
96% of 717 addresses can get 100/20 Mbps; 93% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Grant PUD | Fiber | 88% | 1,000/1,000 |
| CenturyLink | DSL | 57% | 40/3 |
| Ziply Fiber | Fiber, Fixed wireless | 26% | 1,000/1,000 |
| AT&T | Fixed wireless | 39% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Mattawa’s trash rules yet
Pickup rules, the dump and recycling in Mattawa.
Where your child goes to school
Public school districts and the school path by grade.
Mattawa is in Wahluke School District.
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 Apr 2024; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Sep 30, 2026.
Mattawa is in ZIP code 99349
ZIP codes where Mattawa residents live, with the share of the town in each.
| ZIP | Post office name | Share of Mattawa | ZIP’s residents in Mattawa |
|---|---|---|---|
| 99349 | Mattawa, WA | 100% | 42% |
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 Mattawa
Who supplies Mattawa’s drinking water, and has it had violations?
The City of Mattawa water system (EPA ID WA5352000). It reported 1 health-based violation to EPA in the five years to October 2026: a bacteria testing requirement (Revised Total Coliform Rule). 80% of systems its size had none. Its latest lead 90th percentile was 0.0 ppb (Jan 2021–Dec 2023), against a 15 ppb action level.
Who provides electricity in Mattawa?
PUD No 2 of Grant County (PUD No 2 of Grant County - (WA)), a political subdivision utility. Its homes paid about 6.2¢ per kWh in 2025 (EIA).
What internet providers serve Mattawa?
Grant PUD, CenturyLink, Ziply Fiber, AT&T (FCC, as of December 2025).
What ZIP codes are in Mattawa?
99349. Census 2020 ZIP Code Tabulation Areas.
What school district is Mattawa in?
Wahluke School District.
How do I register to vote in Mattawa?
In Washington you can register online until 8 days before Election Day, in person up to and including Election Day, or by mail (received 8 days before). Elections here are run by the Grant County Auditor. Check your registration at voter.votewa.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: 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 30, 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.