Photo: Wwoods · CC BY-SA 3.0Living in Cohasset, MA: what to set up and who to call
Cohasset Water Dept reported 5 health-based violations to EPA in the last five years: disinfection byproducts (TTHM) ×5. 80% of systems its size reported none. Cohasset has its own drop-off, Cohasset Recycling Transfer Station.
I’m new in town
What to set up in Cohasset, 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 Cohasset.
Power comes from National Grid
National Grid (Massachusetts Electric Co.), an investor-owned utility, serves all of Cohasset. Its homes paid an average of 33.7¢ per kWh in 2025, about $164 a month (its average across Massachusetts, for customers on its standard service). Massachusetts lets you buy power from another supplier; 64% of National Grid’s home customers do, and National Grid still delivers it.
Start or move service: masselec.com · (972) 505-4700
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Cohasset Water Dept
Cohasset Water Dept supplies Cohasset: about 89% of residents live in its service area. Weir River Water System serves another 11%. About 6% of homes are outside any mapped community water system, most likely on private wells, which EPA doesn’t regulate. It draws surface water and serves 7,555 people in all.
5 health-based violations reported to EPA in the five years to October 2026: disinfection byproducts (TTHM) ×5, the latest beginning Jul 2026. 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 2023–Dec 2025, was 2.0 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. MA4065000.
4 home internet providers serve Cohasset
100% of 2,946 addresses can get 100/20 Mbps; 91% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Xfinity | Cable | 100% | 1,200/35 |
| Verizon | Fiber, Fixed wireless | 94% | 980/880 |
| T-Mobile | Fixed wireless | 77% | 100/20 |
| AT&T | Fixed wireless | 51% | 25/3 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
Cohasset has its own drop-off: Cohasset Recycling Transfer Station
Where to take trash and recycling in Cohasset, and where the rules are.
Cohasset Recycling Transfer Station
Before you go, check the rules on townofcohasset.org.
OpenStreetMap, as of Oct 9, 2026 (last edited Mar 2024). © OpenStreetMap contributors.
Where your child goes to school
Public school districts and the school path by grade.
Cohasset is in Cohasset School District.
ASchool 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 Jun 2023; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Cohasset is in ZIP code 02025
ZIP codes where Cohasset residents live, with the share of the town in each.
| ZIP | Post office name | Share of Cohasset | ZIP’s residents in Cohasset |
|---|---|---|---|
| 02025 | Cohasset, MA | 100% | 100% |
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.
Train: OpenStreetMap (© OpenStreetMap contributors). ER: CMS hospital data. Library: IMLS Public Libraries Survey, FY2024.
Questions about living in Cohasset
Who supplies Cohasset’s drinking water, and has it had violations?
Cohasset Water Dept (EPA ID MA4065000). It reported 5 health-based violations to EPA in the five years to October 2026: disinfection byproducts (TTHM) ×5. 80% of systems its size had none. Its latest lead 90th percentile was 2.0 ppb (Jan 2023–Dec 2025), against a 15 ppb action level.
Who provides electricity in Cohasset?
National Grid (Massachusetts Electric Co.), an investor-owned utility. Its homes paid about 33.7¢ per kWh in 2025 (EIA).
What internet providers serve Cohasset?
Xfinity, Verizon, T-Mobile, AT&T (FCC, as of December 2025).
What ZIP codes are in Cohasset?
02025. Census 2020 ZIP Code Tabulation Areas.
What school district is Cohasset in?
Cohasset School District.
How do I register to vote in Cohasset?
In Massachusetts you can register online until 10 days before Election Day, in person until 10 days before Election Day, or by mail (postmarked 10 days before). Elections here are run by the Cohasset Town Clerk. Check your registration at sec.state.ma.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 Nov 18, 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.