Photo: Quintin Soloviev · CC BY 4.0Living in Dering Harbor, NY: what to set up and who to call
Power in Dering Harbor comes from PSEG Long Island, a state utility rather than a private company. The closest public drop-off to Dering Harbor is Shelter Island Recycling Center, 2 miles out; the town decides whether residents may use it.
I’m new in town
What to set up in Dering Harbor, 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 Dering Harbor.
Power comes from PSEG Long Island
PSEG Long Island (Long Island Power Authority), a state utility, serves all of Dering Harbor. Its homes paid an average of 26.2¢ per kWh in 2025, about $195 a month (its average across New York, for customers on its standard service). New York lets you buy power from another supplier; 0% of PSEG Long Island’s home customers do, and PSEG Long Island still delivers it.
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Dering Harbor Water District
Dering Harbor Water District supplies Dering Harbor: about 78% of residents live in its service area. About 22% 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 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 78% of the 11,392 systems serving <=100 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan–Dec 2023, was 1.2 ppb, below the 15 ppb action level that applied. That’s higher than 64% 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 (EPA’s estimate). Violations are counted by the start of their compliance period. NY5103700.
3 home internet providers serve Dering Harbor
95% of 36 addresses can get 100/20 Mbps; 10% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Optimum | Cable, Fiber | 92% | 8,000/8,000 |
| Verizon | Fixed wireless | 53% | 25/6 |
| T-Mobile | Fixed wireless | 31% | 25/3 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
The nearest public drop-off is 2 miles away
Pickup rules, the dump and recycling in Dering Harbor.
Shelter Island Recycling Center
34 North Menantic Road, Shelter Island, NY, 11964
This isn’t Dering Harbor’s own facility. Whether Dering Harbor residents may use it is the town’s rule: check deringharborvillage.org.
OpenStreetMap, as of Oct 9, 2026. © OpenStreetMap contributors.
Where your child goes to school
Public school districts and the school path by grade.
Dering Harbor is in Shelter Island Union Free 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.
Town hall and registering to vote
Who to call, and how to register.
Election office: FVAP local election office directory, updated Sep 2024; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Aug 3, 2026.
Dering Harbor is in ZIP code 11964
ZIP codes where Dering Harbor residents live, with the share of the town in each.
| ZIP | Post office name | Share of Dering Harbor | ZIP’s residents in Dering Harbor |
|---|---|---|---|
| 11964 | Shelter Island, NY | 100% | 2% |
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 Dering Harbor
Who supplies Dering Harbor’s drinking water, and has it had violations?
Dering Harbor Water District (EPA ID NY5103700). It reported no health-based violations to EPA in the five years to October 2026; 78% of systems its size had none. Its latest lead 90th percentile was 1.2 ppb (Jan–Dec 2023), against a 15 ppb action level.
Who provides electricity in Dering Harbor?
PSEG Long Island (Long Island Power Authority), a state utility. Its homes paid about 26.2¢ per kWh in 2025 (EIA).
What internet providers serve Dering Harbor?
Optimum, Verizon, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Dering Harbor?
11964. Census 2020 ZIP Code Tabulation Areas.
What school district is Dering Harbor in?
Shelter Island Union Free School District.
How do I register to vote in Dering Harbor?
In New York you can register online until 10 days before Election Day, in person until 10 days before Election Day, or by mail (postmarked 15 days before and received 10 days before). Elections here are run by the Suffolk County Board of Elections. Check your registration at voterlookup.elections.ny.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 Aug 3, 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.