Short answer: No active county sewer district covers Bayport on the county's GIS layer, so homes here use cesspools, septic tanks or I/A systems unless a village or private plant serves them.
Bayport in numbers
| Town | Town of Islip |
|---|---|
| Area | 3.65 sq mi |
| In active sewer district | 0% |
| In proposed district | 4% · Oakdale Phase 3, Oakdale Phase 7 |
| Groundwater zone | Zone VI 100% |
| FEMA flood zone | 12% |
| One-family lots / median | 2,220 / 0.37 ac |
| One-family lots outside active sewer districts | about 2,220 |
Computed 2026-11-07 from Suffolk County GIS (hamlet boundaries, sewer districts, groundwater management zones, FEMA flood zones, protection areas, tax parcels). Shares are of land area; a district boundary is not a hookup, and some village-run systems are missing from the county layer. Method and full table.
Sewer coverage
No active county sewer district covers Bayport on the county's GIS layer, so homes here use cesspools, septic tanks or I/A systems unless a village or private plant serves them. A sliver (4%) is inside a proposed district (“Oakdale Phase 3”, “Oakdale Phase 7”). Counting lots instead of land: about 2,220 of the 2,220 one-family lots touching Bayport lie outside any active sewer district, and those homes rely on on-site systems. Next door: Blue Point (0% sewered, median lot 0.28 ac); Sayville (0% sewered, median lot 0.28 ac); Patchogue (17% sewered, median lot 0.22 ac). By active-sewer share Bayport ranks 65 of the 165 Suffolk hamlets and villages we measured.
Groundwater, lots and flood exposure
Groundwater management Zone VI: Article 6's minimum lot for a new home on an on-site system here is 40,000 sq ft, unless the density is met another way or an exemption applies. County parcel records show 2,220 one-family lots touching Bayport, with a median of 0.37 acres (about 16,000 sq ft), below that minimum and the 82nd-largest median lot in our Suffolk table. 12% of the land is in FEMA's 1%-annual-chance flood zone.
For most Bayport homes the main running cost is pumping; when a cesspool fails, the replacement must include at least a septic tank, and grants can cover most of an I/A system. With 12% of the land in the flood zone, ask whether groundwater flows back into the cesspool after pumping; in Suffolk that is a failed-system condition.
Who handles what in Bayport
- Building and electrical permits: Town of Islip
- System approvals and grants: SCDHS, 631-852-5700 (permits) / 631-852-5811 (grants)
Frequently asked questions
Is Bayport on public sewer?
Generally not: no active county sewer district covers Bayport on the county's map.
Can Bayport homeowners get septic grants?
Yes, if the home isn't sewered and isn't in a proposed sewer district: up to $20,000 from Suffolk and up to $25,000 from the state.
County rules, licensing and grant steps: Town of Islip overview, septic grants, replacement rules. More in Islip: Sayville, Holbrook, Bohemia.
Sources
Each source was re-read on November 7, 2026. Program amounts and rules change; the agency page is the authority.
- Suffolk County GIS Viewer map service (hamlets, villages, sewer districts, groundwater zones, flood zones, tax parcels)
- Suffolk County Sanitary Code, Article 6 (amended 12/1/2020)
- Suffolk County: Septic Improvement Program information
- Suffolk County: SIP property eligibility lookup
Need cesspool or septic work in Bayport?
Submit a request with your address. We match it to an independent, licensed Suffolk County operator who serves that address; the operator confirms the time and price with you.
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