Short answer: Bayville 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).
Bayville in numbers
| Town | Town of Oyster Bay |
|---|---|
| Status | Incorporated village |
| Area | 1.41 sq mi |
| Sewer (county list) | Not publicly sewered |
| Parcels / median parcel | about 2,739 / 0.16 ac |
| Building permits | Village of Bayville |
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
Bayville has no public sewer collection district on the county health department's list; wastewater is handled on each lot. Bayville covers 1.41 square miles; the roughly 2,739 parcels touching its boundary have a median size of 0.16 acres (about 7,000 sq ft). That is the 68th-largest median parcel of the 133 Nassau places we measured. Nearby: Bayville (unincorporated) (on public sewer, median parcel 0.18 ac); Mill Neck (not publicly sewered, median parcel 2.95 ac); Lattingtown (not publicly sewered, median parcel 2.00 ac).
Grant and permits
Because the county lists Bayville 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 Village of Bayville; 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 Bayville properties, Nassau grant amount and no-stacking details are on the Nassau County overview and Long Island grants guide.
Who handles what in Bayville
- Building permits: Village of Bayville
- S.E.P.T.I.C. grants: 516-364-5861 ([email protected])
Frequently asked questions
Is Bayville on public sewer?
Bayville 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 Bayville?
The Village of Bayville building department, with a contractor holding a Nassau County Home Improvement License.
Rules and grant steps: Town of Oyster Bay overview, Nassau regulations, S.E.P.T.I.C. details. More nearby: Locust Valley, East Norwich, Oyster Bay Cove, Glen Head.
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 Bayville?
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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