Photo: johnaac · CC BY 3.0Living in Mahopac, NY: what to set up and who to call
Mahopac has no town government of its own, so Putnam County runs its elections and most services, and its children attend Mahopac Central School District. Mahopac Water Co has a clean five-year EPA record, but its latest lead result, 6.4 ppb, was higher than 95% of similar systems’ (the action level is 15).
I’m new in town
What to set up in Mahopac, 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 Mahopac.
Power comes from New York State Elec & Gas
New York State Elec & Gas (New York State Elec & Gas Corp), an investor-owned utility, serves all of Mahopac. Its homes paid an average of 22.6¢ per kWh in 2025, about $168 a month (its average across New York, for customers on its standard service). New York lets you buy power from another supplier; 6% of New York State Elec & Gas’ home customers do, and New York State Elec & Gas still delivers it.
Start or move service: nyseg.com · (800) 572-1131
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Mahopac Water Co
Mahopac Water Co supplies Mahopac: about 42% of residents live in its service area. Chateau Ridge serves another 9%. Somers Consolidated Water District #1 serves another 8%. About 29% 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 1,202 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 78% of the 7,966 systems serving 1,001–3,300 people.
The latest lead result on file, the 90th percentile of homes sampled in Jul–Dec 2024, was 6.4 ppb, below the 15 ppb action level that applied. The highest in five years was 55.4 ppb. That’s higher than 95% 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. NY3905707.
4 home internet providers serve Mahopac
100% of 2,923 addresses can get 100/20 Mbps; 96% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Verizon | Fiber, Fixed wireless | 98% | 2,300/2,300 |
| Xfinity | Cable | 93% | 1,200/35 |
| Optimum | Cable, Fiber | 3% | 940/35 |
| T-Mobile | Fixed wireless | 84% | 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 Mahopac.
City Carting & Recycling
241 Route 100, Somers, 10536
This isn’t Mahopac’s own facility. Whether Mahopac 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.
Mahopac is in Mahopac 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
Mahopac is unincorporated, so Putnam 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.
Mahopac is in ZIP code 10541
ZIP codes where Mahopac residents live, with the share of the town in each.
| ZIP | Post office name | Share of Mahopac | ZIP’s residents in Mahopac |
|---|---|---|---|
| 10541 | Mahopac, NY | 99% | 34% |
A few homes fall in 10542.
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 Mahopac
Who supplies Mahopac’s drinking water, and has it had violations?
Mahopac Water Co (EPA ID NY3905707). 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 6.4 ppb (Jul–Dec 2024), against a 15 ppb action level.
Who provides electricity in Mahopac?
New York State Elec & Gas (New York State Elec & Gas Corp), an investor-owned utility. Its homes paid about 22.6¢ per kWh in 2025 (EIA).
What internet providers serve Mahopac?
Verizon, Xfinity, Optimum, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Mahopac?
10541. Census 2020 ZIP Code Tabulation Areas.
What school district is Mahopac in?
Mahopac Central School District.
How do I register to vote in Mahopac?
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 Putnam 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.