Short answer: Most of Nassau County is on public sewer, but the county health department lists more than 30 communities, nearly all on the North Shore, as not publicly sewered. Homes there use cesspools, septic tanks or I/A systems. Contractors need a Nassau County Home Improvement License, and the S.E.P.T.I.C. program pays for nitrogen-reducing upgrades, up to $35,000 per the program administrator (Nassau County Soil & Water Conservation District); the county page still lists $20,000; confirm at 516-364-5861.
Last updated: November 2026.
How a request works
ClickCesspool is a dispatch platform. You submit your address and the problem; we match it to an independent operator holding a Nassau County Home Improvement License who serves that address; the operator confirms the time and price with you.
Communities without public sewer
From the Nassau County Department of Health's list of public sewer collection districts by community:
- Bayville
- Brookville
- Centre Island
- Cove Neck
- East Hills
- East Norwich
- Glen Head
- Glenwood
- Glenwood Landing
- Great Neck Estates
- Greenvale
- Kings Point
- Lattingtown
- Laurel Hollow
- Locust Valley
- Manhasset
- Matinecock
- Mill Neck
- Munsey Park
- Muttontown
- Old Brookville
- Old Westbury
- Oyster Bay Cove
- Plandome
- Plandome Heights
- Plandome Manor
- Roslyn Estates
- Roslyn Harbor
- Roslyn Heights
- Sands Point
- Sea Cliff
- Split Rock
- Upper Brookville
- Flower Hill (western part)
Towns and cities
| Town or city | Communities listed as not publicly sewered |
|---|---|
| Town of Hempstead | 0 |
| Town of North Hempstead | 16 |
| Town of Oyster Bay | 21 |
| City of Glen Cove | 0 |
| City of Long Beach | 0 |
The rules in brief
- Single-family septic approvals generally run through the town, city or village building department; the county health department reviews larger projects.
- Home Improvement License for anyone pumping, repairing or installing.
- No county I/A mandate found for existing homes; S.E.P.T.I.C. is voluntary.
Full detail: Nassau County cesspool and septic regulations.
Community pages
Bayville · East Hills · East Norwich · Flower Hill · Glen Head · Great Neck · Great Neck Estates · Kings Point · Locust Valley · Manhasset · Munsey Park · Muttontown · Old Westbury · Oyster Bay Cove · Plandome · Plandome Manor · Port Washington · Roslyn Estates · Roslyn Heights · Sands Point · Sea Cliff
Frequently asked questions
Which Nassau County communities are not on sewer?
The county health department lists: Bayville, Brookville, Centre Island, Cove Neck, East Hills, East Norwich, Glen Head, Glenwood, Glenwood Landing, Great Neck Estates, Greenvale, Kings Point, Lattingtown, Laurel Hollow, Locust Valley, Manhasset, Matinecock, Mill Neck, Munsey Park, Muttontown, Old Brookville, Old Westbury, Oyster Bay Cove, Plandome, Plandome Heights, Plandome Manor, Roslyn Estates, Roslyn Harbor, Roslyn Heights, Sands Point, Sea Cliff, Split Rock, Upper Brookville, plus the western part of Flower Hill. The list is by community, not by street.
What license does a cesspool company need in Nassau County?
Cesspool and septic building, installation and cleaning count as home improvement work, so the contractor needs a Nassau County Home Improvement License from the Department of Consumer Affairs.
Does Nassau County offer a septic grant?
Yes. S.E.P.T.I.C. pays toward replacing a cesspool or septic system with an approved nitrogen-reducing system, for eligible properties outside existing and proposed sewer districts: up to $35,000 per the program administrator (Nassau County Soil & Water Conservation District); the county page still lists $20,000; confirm at 516-364-5861. In Nassau the state Septic System Replacement Fund is already inside the S.E.P.T.I.C. grant (the county's $20,000 figure is $10,000 of federal ARPA money plus $10,000 of state SSRP money, per NYS EFC), so don't add the $25,000 state amount on top.
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 Soil & Water Conservation District: S.E.P.T.I.C. program (program administrator)
- Nassau County: S.E.P.T.I.C. program
- Nassau County: Septic FAQ
- NYS Environmental Facilities Corporation: Septic System Replacement Fund (other funding sources)
- Nassau County GIS map service (place boundaries, tax parcels)
Have a cesspool or septic question on Long Island?
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