Photo: User:Magicpiano · CC BY-SA 4.0Living in Seabrook, NH: what to set up and who to call
Seabrook has its own drop-off, Seabrook Transfer Station. Elections in Seabrook are run by Seabrook itself; register with the town clerk of Seabrook.
I’m new in town
What to set up in Seabrook, 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 Seabrook.
Power comes from Unitil
Unitil (Unitil Energy Systems), an investor-owned utility, serves all of Seabrook. Its homes paid an average of 21.7¢ per kWh in 2025, about $131 a month (its average across New Hampshire, for customers on its standard service). New Hampshire lets you buy power from another supplier; 65% of Unitil’s home customers do, and Unitil still delivers it.
Start or move service: unitil.com · (800) 582-7276
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Seabrook Water Dept
Seabrook Water Dept supplies Seabrook: about 92% of residents live in its service area. About 8% 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 14,000 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 83% of the 3,525 systems serving 10,001–50,000 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2022–Dec 2024, was 3.0 ppb, below the 15 ppb action level that applied. That’s higher than 79% 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. NH2111010.
5 home internet providers serve Seabrook
100% of 3,480 addresses can get 100/20 Mbps; 79% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Xfinity | Cable | 100% | 2,000/250 |
| Fidium Fiber | Fiber | 79% | 2,000/2,000 |
| T-Mobile | Fixed wireless | 58% | 100/20 |
| Verizon | Fixed wireless | 54% | 300/20 |
| AT&T | Fixed wireless | 15% | 25/3 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
Seabrook has its own drop-off: Seabrook Transfer Station
Where to take trash and recycling in Seabrook, and where the rules are.
Seabrook Transfer Station
Before you go, check the rules on seabrooknh.org.
OpenStreetMap, as of Oct 9, 2026 (last edited Oct 2020). © OpenStreetMap contributors.
Where your child goes to school
Public school districts and the school path by grade.
Seabrook is in two districts that split the grades: Seabrook School District and Winnacunnet Cooperative 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 Sep 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 19, 2024.
Seabrook is in ZIP code 03874
ZIP codes where Seabrook residents live, with the share of the town in each.
| ZIP | Post office name | Share of Seabrook | ZIP’s residents in Seabrook |
|---|---|---|---|
| 03874 | Seabrook, NH | 100% | 98% |
A few homes fall in 03844.
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 Seabrook
Who supplies Seabrook’s drinking water, and has it had violations?
Seabrook Water Dept (EPA ID NH2111010). It reported no health-based violations to EPA in the five years to October 2026; 83% of systems its size had none. Its latest lead 90th percentile was 3.0 ppb (Jan 2022–Dec 2024), against a 15 ppb action level.
Who provides electricity in Seabrook?
Unitil (Unitil Energy Systems), an investor-owned utility. Its homes paid about 21.7¢ per kWh in 2025 (EIA).
What internet providers serve Seabrook?
Xfinity, Fidium Fiber, T-Mobile, Verizon, AT&T (FCC, as of December 2025).
What ZIP codes are in Seabrook?
03874. Census 2020 ZIP Code Tabulation Areas.
What school district is Seabrook in?
Seabrook School District and Winnacunnet Cooperative School District.
How do I register to vote in Seabrook?
New Hampshire has no online registration; you can register in person up to and including Election Day or by mail only in special circumstances (received 13 days before). Elections here are run by the Town Clerk of Seabrook. Check your registration at app.sos.nh.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 Nov 19, 2024 (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.