Living in Triangle, VA: what to set up and who to call
Triangle has no town government of its own, so Prince William County runs its elections and most services, and its children attend Prince William County Public Schools. The nearest library is Dumfries Library (Prince William Public Libraries), 1.1 miles away.
I’m new in town
What to set up in Triangle, 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 Triangle.
Power comes from Dominion Energy
Dominion Energy (Virginia Electric & Power Co.), an investor-owned utility, serves all of Triangle. Its homes paid an average of 15.2¢ per kWh in 2025, about $158 a month (its average across Virginia).
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Pwcsa - East water system
The Pwcsa - East water system supplies almost all of Triangle. It buys treated surface water (EPA lists Fairfax Water and Dale City as sellers) and serves 168,747 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 86% of the 332 systems serving 100,001–250,000 people.
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. VA6153600.
4 home internet providers serve Triangle
100% of 2,152 addresses can get 100/20 Mbps; 87% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Xfinity | Cable | 99% | 2,000/250 |
| Verizon | Fiber, Fixed wireless | 97% | 980/880 |
| T-Mobile | Fixed wireless | 68% | 100/20 |
| AT&T | Fixed wireless | 57% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Triangle’s trash rules yet
Pickup rules, the dump and recycling in Triangle.
Where your child goes to school
Public school districts and the school path by grade.
Triangle is in Prince William County Public Schools.
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
Triangle is unincorporated, so Prince William 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 30, 2026.
Triangle is in ZIP code 22172
ZIP codes where Triangle residents live, with the share of the town in each.
| ZIP | Post office name | Share of Triangle | ZIP’s residents in Triangle |
|---|---|---|---|
| 22172 | Triangle, VA | 100% | 90% |
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 Triangle
Who supplies Triangle’s drinking water, and has it had violations?
The Pwcsa - East water system (EPA ID VA6153600). It reported no health-based violations to EPA in the five years to October 2026; 86% 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 Triangle?
Dominion Energy (Virginia Electric & Power Co.), an investor-owned utility. Its homes paid about 15.2¢ per kWh in 2025 (EIA).
What internet providers serve Triangle?
Xfinity, Verizon, T-Mobile, AT&T (FCC, as of December 2025).
What ZIP codes are in Triangle?
22172. Census 2020 ZIP Code Tabulation Areas.
What school district is Triangle in?
Prince William County Public Schools.
How do I register to vote in Triangle?
In Virginia you can register online until 11 days before Election Day, in person up to and including Election Day, or by mail (postmarked 11 days before). Elections here are run by the Prince William General Registrar. Check your registration at vote.elections.virginia.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.