Living in Syosset, NY: what to set up and who to call
Syosset has no town government of its own, so Nassau County runs its elections and most services, and its children attend Syosset Central School District. The Jericho WD water system reported one health-based violation to EPA in the last five years: a lead and copper treatment requirement (Lead and Copper Rule), beginning Jul 2023.
I’m new in town
What to set up in Syosset, 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 Syosset.
Power comes from PSEG Long Island
PSEG Long Island (Long Island Power Authority), a state utility, serves all of Syosset. 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 Jericho WD water system
The Jericho WD water system supplies almost all of Syosset. It draws ground water and serves 58,000 people in all.
1 health-based violation reported to EPA in the five years to October 2026: a lead and copper treatment requirement (Lead and Copper Rule), beginning Jul 2023. 90% of the 597 systems serving 50,001–100,000 people had none.
The latest lead result on file, the 90th percentile of homes sampled in Jan–Dec 2026, was 2.0 ppb, below the 15 ppb action level that applied. The highest in five years was 5.0 ppb. That’s higher than 66% 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. NY2902831.
3 home internet providers serve Syosset
99% of 6,084 addresses can get 100/20 Mbps; 99% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Verizon | Fiber, Fixed wireless | 99% | 2,300/2,300 |
| Optimum | Cable, Fiber | 96% | 8,000/8,000 |
| T-Mobile | Fixed wireless | 83% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
The nearest public drop-off is 5 miles away
Pickup rules, the dump and recycling in Syosset.
Town of Oyster Bay Solid Waste Disposal Complex
11804
This isn’t Syosset’s own facility. Whether Syosset residents may use it is the town’s rule: check the town’s office.
OpenStreetMap, as of Oct 9, 2026. © OpenStreetMap contributors.
Where your child goes to school
Public school districts and the school path by grade.
Most of Syosset (99%) is in Syosset Central 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
Syosset is unincorporated, so Nassau County is the local government.
Election office: FVAP local election office directory, updated Jul 2019; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Aug 3, 2026.
Syosset is in ZIP code 11791
ZIP codes where Syosset residents live, with the share of the town in each.
| ZIP | Post office name | Share of Syosset | ZIP’s residents in Syosset |
|---|---|---|---|
| 11791 | Syosset, NY | 100% | 74% |
A few homes fall in 11803. 11773 is P.O. box or single-organization ZIP with no homes.
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 Syosset
Who supplies Syosset’s drinking water, and has it had violations?
The Jericho WD water system (EPA ID NY2902831). It reported 1 health-based violation to EPA in the five years to October 2026: a lead and copper treatment requirement (Lead and Copper Rule). 90% of systems its size had none. Its latest lead 90th percentile was 2.0 ppb (Jan–Dec 2026), against a 15 ppb action level.
Who provides electricity in Syosset?
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 Syosset?
Verizon, Optimum, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Syosset?
11791. Census 2020 ZIP Code Tabulation Areas.
What school district is Syosset in?
Syosset Central School District.
How do I register to vote in Syosset?
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 Nassau 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.