Short answer: The town's North Shore villages and hamlets make up most of Nassau's unsewered communities. The county lists 21 communities here as not publicly sewered; those homes use cesspools, septic tanks or I/A systems and can qualify for Nassau's S.E.P.T.I.C. grant, 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. Sewer status from the Nassau County Department of Health community list; areas and parcels from Nassau County GIS (2026-11-07).
Communities in the Town of Oyster Bay and their sewer status
| Community | Sewer authority (county list) | Area (sq mi) | Median parcel (ac) |
|---|---|---|---|
| Bayville (village) | Not publicly sewered | 1.41 | 0.16 |
| Bayville (unincorporated) | Not on the county list | 0.15 | 0.18 |
| Bethpage | Nassau County Department of Public Works | 3.67 | 0.16 |
| Brookville (village) | Not publicly sewered | 4.01 | 2.04 |
| Centre Island (village) | Not publicly sewered | 1.09 | 1.79 |
| Cove Neck (village) | Not publicly sewered | 1.39 | 2.91 |
| East Hills (village) | Not publicly sewered | 2.24 | 0.35 |
| East Massapequa | Not on the county list | 3.43 | 0.17 |
| East Norwich | Not publicly sewered | 1.04 | 0.23 |
| Farmingdale (village) | Nassau County Department of Public Works | 1.1 | 0.17 |
| Glen Head | Not publicly sewered | 1.64 | 0.21 |
| Glenwood Landing | Not publicly sewered | 1.35 | 0.19 |
| Greenvale | Not publicly sewered | 0.27 | 0.18 |
| Hicksville | Nassau County Department of Public Works | 6.78 | 0.15 |
| Jericho | Nassau County Department of Public Works | 4.41 | 0.23 |
| Lattingtown (village) | Not publicly sewered | 3.79 | 2.00 |
| Laurel Hollow (village) | Not publicly sewered | 2.99 | 2.04 |
| Locust Valley | Not publicly sewered | 1.02 | 0.18 |
| Massapequa | Nassau County Department of Public Works | 3.69 | 0.17 |
| Massapequa Park (village) | Nassau County Department of Public Works | 2.2 | 0.14 |
| Matinecock (village) | Not publicly sewered | 2.66 | 2.63 |
| Mill Neck (village) | Not publicly sewered | 2.79 | 2.95 |
| Muttontown (village) | Not publicly sewered | 6.08 | 2.00 |
| North Massapequa | Nassau County Department of Public Works | 2.99 | 0.16 |
| Old Bethpage | Nassau County Department of Public Works | 4.08 | 0.23 |
| Old Brookville (village) | Not publicly sewered | 3.97 | 2.05 |
| Old Westbury (village) | Not publicly sewered | 8.5 | 2.00 |
| Oyster Bay | Oyster Bay Sewer District | 1.27 | 0.18 |
| Oyster Bay Cove (village) | Not publicly sewered | 4.19 | 2.06 |
| Plainedge | Nassau County Department of Public Works | 1.42 | 0.16 |
| Plainview | Nassau County Department of Public Works | 5.71 | 0.17 |
| Roslyn Harbor (village) | Not publicly sewered | 1.18 | 1.00 |
| Sea Cliff (village) | Not publicly sewered | 1.09 | 0.19 |
| South Farmingdale | Nassau County Department of Public Works | 2.21 | 0.16 |
| Syosset | Nassau County Department of Public Works | 5.0 | 0.20 |
| Upper Brookville (village) | Not publicly sewered | 4.3 | 2.12 |
| Woodbury | Nassau County Department of Public Works | 5.07 | 0.64 |
"Not on the county list" means the community isn't named on the health department's list; ask the town or village.
Rules that apply
- Contractors pumping, repairing or installing need a Nassau County Home Improvement License. See Nassau County regulations.
- Building permits: Town of Oyster Bay building department; incorporated villages run their own.
- No county rule we found requires an I/A system for an existing home; S.E.P.T.I.C. upgrades are voluntary.
Frequently asked questions
Which parts of the Town of Oyster Bay have no public sewer?
The Nassau County Department of Health lists these communities as not publicly sewered: Bayville, Brookville, Centre Island, Cove Neck, East Hills, East Norwich, Glen Head, Glenwood Landing, Greenvale, Lattingtown, Laurel Hollow, Locust Valley, Matinecock, Mill Neck, Muttontown, Old Brookville, Old Westbury, Oyster Bay Cove, Roslyn Harbor, Sea Cliff, Upper Brookville. The list is by community, not street.
Is there a septic grant in Nassau County?
Yes. Nassau's S.E.P.T.I.C. program helps replace a cesspool or septic system with an approved nitrogen-reducing system, for properties outside existing and proposed sewer districts (with narrow exceptions). The amount is 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.
Who issues permits for cesspool work?
Single-family septic work generally goes through the local building department (the town, or the village inside an incorporated village). Contractors need a Nassau County Home Improvement License.
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
- Nassau County: Septic FAQ
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