Living in South Dennis, MA: what to set up and who to call
South Dennis has no town government of its own, so Barnstable County runs its elections and most services, and its children attend Dennis-Yarmouth School District. South Dennis has its own drop-off, Dennis Town Disposal Area, on 100 Theophilus F Smith Road.
I’m new in town
What to set up in South Dennis, 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 South Dennis.
Power comes from Eversource
Eversource (NSTAR Electric Co., doing business as Eversource), an investor-owned utility, serves all of South Dennis. Its homes paid an average of 21.5¢ per kWh in 2025, about $102 a month (its average across Massachusetts, for customers on its standard service). Massachusetts lets you buy power from another supplier; 76% of Eversource’s home customers do, and Eversource still delivers it.
Start or move service: nstar.com · (800) 592-2000
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Dennis Water District
Dennis Water District supplies almost all of South Dennis. It draws ground water and serves 65,000 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 90% of the 597 systems serving 50,001–100,000 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. MA4075000.
4 home internet providers serve South Dennis
100% of 2,785 addresses can get 100/20 Mbps; 0% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Xfinity | Cable, Fiber | 100% | 1,200/35 |
| T-Mobile | Fixed wireless | 40% | 100/20 |
| Verizon | Fixed wireless | 33% | 300/20 |
| AT&T | Fixed wireless | 31% | 25/3 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
South Dennis has its own drop-off: Dennis Town Disposal Area
Where to take trash and recycling in South Dennis, and where the rules are.
Dennis Town Disposal Area
100 Theophilus F Smith Road, South Dennis, MA, 02660
A fee applies (OSM). Before you go, check the rules on town.dennis.ma.us.
OpenStreetMap, as of Oct 9, 2026 (last edited Sep 2026). © OpenStreetMap contributors.
Where your child goes to school
Public school districts and the school path by grade.
South Dennis is in Dennis-Yarmouth School District.
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
South Dennis is unincorporated, so Barnstable County is the local government.
Election office: FVAP local election office directory, updated Jul 2021; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
South Dennis is in ZIP code 02660
ZIP codes where South Dennis residents live, with the share of the town in each.
| ZIP | Post office name | Share of South Dennis | ZIP’s residents in South Dennis |
|---|---|---|---|
| 02660 | South Dennis, MA | 100% | 59% |
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 South Dennis
Who supplies South Dennis’ drinking water, and has it had violations?
Dennis Water District (EPA ID MA4075000). It reported no health-based violations to EPA in the five years to October 2026; 90% 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 South Dennis?
Eversource (NSTAR Electric Co., doing business as Eversource), an investor-owned utility. Its homes paid about 21.5¢ per kWh in 2025 (EIA).
What internet providers serve South Dennis?
Xfinity, T-Mobile, Verizon, AT&T (FCC, as of December 2025).
What ZIP codes are in South Dennis?
02660. Census 2020 ZIP Code Tabulation Areas.
What school district is South Dennis in?
Dennis-Yarmouth School District.
How do I register to vote in South Dennis?
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 Dennis 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.