Short answer: The county health department lists Port Washington Water Pollution Control District (516-944-6100) as the sewer authority for Port Washington; properties the district can't connect still use on-site systems.
Port Washington in numbers
| Town | Town of North Hempstead |
|---|---|
| Status | Unincorporated hamlet |
| Area | 4.68 sq mi |
| Sewer (county list) | Port Washington Water Pollution Control District (516-944-6100) |
| Parcels / median parcel | about 5,435 / 0.16 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
The county health department lists Port Washington Water Pollution Control District (516-944-6100) as the sewer authority for Port Washington; properties the district can't connect still use on-site systems. Port Washington covers 4.68 square miles; the roughly 5,435 parcels touching its boundary have a median size of 0.16 acres (about 7,100 sq ft). That is the 80th-largest median parcel of the 133 Nassau places we measured. Nearby: Port Washington North (on public sewer, median parcel 0.14 ac); Baxter Estates (on public sewer, median parcel 0.23 ac); Sands Point (not publicly sewered, median parcel 1.33 ac).
Grant and permits
Connected homes don't qualify for S.E.P.T.I.C.; a property in Port Washington that the district documents can't connect may. 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 Port Washington properties, Nassau grant amount and no-stacking details are on the Nassau County overview and Long Island grants guide.
Who handles what in Port Washington
- Building permits: Town of North Hempstead
- Sewer: Port Washington Water Pollution Control District (516-944-6100)
- S.E.P.T.I.C. grants: 516-364-5861 ([email protected])
Frequently asked questions
Is Port Washington on public sewer?
The county health department lists Port Washington Water Pollution Control District (516-944-6100) as the sewer authority for Port Washington; properties the district can't connect still use on-site systems.
Who issues permits for septic work in Port Washington?
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: Sands Point, Plandome Manor, Sea Cliff, Plandome.
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 Port Washington?
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.
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