Short answer: Manhasset has no public sewer collection district on the county health department's list; wastewater is handled on each lot. Nassau's S.E.P.T.I.C. grant for eligible nitrogen-reducing upgrades is up to $35,000 per its administrator (details below).
Manhasset in numbers
| Town | Town of North Hempstead |
|---|---|
| Status | Unincorporated hamlet |
| Area | 2.41 sq mi |
| Sewer (county list) | Not publicly sewered |
| Parcels / median parcel | about 2,866 / 0.18 ac |
| Building permits | Town of North Hempstead |
Area and parcels computed 2026-11-07 from Nassau County GIS (place boundary; all tax parcels touching it, any use). Sewer status from the Nassau County Department of Health list of sewer districts by community, which is by community, not street.
Sewer status and lots
Manhasset has no public sewer collection district on the county health department's list; wastewater is handled on each lot. Manhasset covers 2.41 square miles; the roughly 2,866 parcels touching its boundary have a median size of 0.18 acres (about 7,800 sq ft). That is the 55th-largest median parcel of the 133 Nassau places we measured. Nearby: Thomaston (on public sewer, median parcel 0.21 ac); Munsey Park (not publicly sewered, median parcel 0.25 ac); Plandome Heights (not publicly sewered, median parcel 0.22 ac).
Grant and permits
Because the county lists Manhasset outside public sewer, its homes fall in the area Nassau's S.E.P.T.I.C. grant was designed for, subject to the program's property test. Permits come from the Town of North Hempstead; the contractor needs a Nassau County Home Improvement License, and no county rule we found requires an I/A system for an existing home.
For Manhasset properties, Nassau grant amount and no-stacking details are on the Nassau County overview and Long Island grants guide.
Who handles what in Manhasset
- Building permits: Town of North Hempstead
- S.E.P.T.I.C. grants: 516-364-5861 ([email protected])
Frequently asked questions
Is Manhasset on public sewer?
Manhasset has no public sewer collection district on the county health department's list; wastewater is handled on each lot.
Who issues permits for septic work in Manhasset?
The Town of North Hempstead building department, with a contractor holding a Nassau County Home Improvement License.
Rules and grant steps: Town of North Hempstead overview, Nassau regulations, S.E.P.T.I.C. details. More nearby: Munsey Park, Plandome, Flower Hill, Roslyn Estates.
Sources
Each source was re-read on November 7, 2026. Program amounts and rules change; the agency page is the authority.
- Nassau County DOH: Public sewer districts by community
- Nassau County GIS map service (place boundaries, tax parcels)
- Nassau County Soil & Water Conservation District: S.E.P.T.I.C. program (program administrator)
- Nassau County: S.E.P.T.I.C. program
Need cesspool or septic work in Manhasset?
Submit a request with your address. We match it to an independent operator with a Nassau County Home Improvement License who serves that address; the operator confirms the time and price with you.
Request Service →