Short answer: About 59% of the Town of Babylon's land is inside an active sewer district on the county map, mostly Southwest Sewer District; lot counts aren't available because Town of Babylon parcel records don't use NYS class 210. There is no town septic rebate, so the county and state grants are the funding.
Last updated: November 2026. Data computed 2026-11-07 from Suffolk County GIS; rules and programs re-read November 7, 2026.
Town of Babylon in numbers
| Land in active sewer districts | 59% |
|---|---|
| Land in proposed districts | 20% |
| Places with ~0% active sewer | 3 of 14 hamlets and villages |
| One-family lots outside active districts | n/a (no class 210 records) |
| Groundwater zones (land share) | Zone VII about 71%; Zone I about 14%; Zone IV about 12%; Zone II about 4% |
| I/A systems installed (Oct 2024) | about 57, 1% of the county's 5,344; 10th of the ten towns |
| Town septic rebate | No |
| Town code on I/A systems | None found beyond the county rules |
Sewer districts and where the cesspools are
- Active districts (4): Southwest Sewer District (about 56%), SCCRI Carlls River Wyandanch Sewer District (about 3%), SCCRI Carlls River Deer Park District (about 1%), Wyandanch - Town of Babylon (under 1%).
- Proposed districts (8 polygons): Unfunded Carlls River (about 14%), Unfunded Carlls River 108-5 and 12 (about 2%), Deer Park Avenue Corridor (about 1%), plus 5 smaller. Homes inside a proposed district are excluded from the county and state septic grants.
The largest unsewered land areas are in Deer Park (6.1 sq mi), Gilgo (4.8 sq mi), East Farmingdale (3.0 sq mi), West Babylon (1.7 sq mi), Wyandanch (1.5 sq mi). Across the town, about 16% of the land is in FEMA's 1%-annual-chance flood zone; 3% is in a Special Groundwater Protection Area.
What the Town of Babylon adds
- Rebate: none listed by the county as of November 7, 2026.
- Town code: no town-wide I/A mandate found beyond the county rules as of November 7, 2026.
- Building department: Town of Babylon; villages with their own: Amityville, Babylon, Lindenhurst.
Every hamlet and village in the Town of Babylon
Land-area shares inside county sewer-district polygons; zone = main Article 6 groundwater zone; flood = FEMA 1%-annual-chance zone; lot = median one-family lot (acres). Linked names have their own page. Some village-run systems are missing from the county layer. Full table: sewer coverage by hamlet.
| Hamlet / village | Active sewer | Proposed sewer | Feasibility study | Zone | Flood | Median lot (ac) |
|---|---|---|---|---|---|---|
| Amityville (village) | 100% | 0% | 0% | Zone VII | 28% | n/a |
| Babylon (village) | 100% | 0% | 0% | Zone VII | 27% | n/a |
| Copiague | 100% | 0% | 0% | Zone VII | 25% | n/a |
| Deer Park | 1% | 98% | under 1% | Zone I | 0% | 0.77 |
| East Farmingdale | 60% | 1% | 0% | Zone VII | 0% | n/a |
| Gilgo | 0% | 0% | 0% | Zone IV | 89% | n/a |
| Lindenhurst (village) | 100% | 0% | 0% | Zone VII | 12% | n/a |
| North Amityville | 100% | 0% | 0% | Zone VII | 0% | n/a |
| North Babylon | 69% | 22% | 0% | Zone VII | 3% | 0.70 |
| North Lindenhurst | 100% | 0% | 0% | Zone VII | 0% | n/a |
| Oak Beach | 0% | 0% | 0% | Zone IV | 75% | n/a |
| West Babylon | 80% | 10% | 0% | Zone VII | 7% | n/a |
| Wheatley Heights | 0% | 66% | 0% | Zone I | 0% | n/a |
| Wyandanch | 32% | 60% | 0% | Zone VII | 0% | n/a |
County rules apply on top: no cesspool-for-cesspool replacement since July 1, 2019, and an I/A system for new homes and major reconstruction since July 1, 2021. Details, licensing and grants: Suffolk County overview.
Frequently asked questions
How much of the Town of Babylon is on sewer?
About 59% of the land in the town's hamlets and villages is inside an active county sewer district, and 20% inside proposed districts; lot counts aren't available because Town of Babylon parcel records don't use NYS class 210. A district boundary is not a connection.
Does the Town of Babylon have a septic rebate?
No town rebate is listed by Suffolk County as of November 7, 2026. Babylon homeowners use the county grant (up to $20,000) and the state grant (up to $25,000); the town had about 57 I/A systems by October 2024.
Who issues building permits for septic work in Babylon?
The Town of Babylon building department, except in the incorporated villages (Amityville, Babylon, Lindenhurst), which run their own. SCDHS approves the sanitary system itself.
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 DHS presentation, 11/19/2024 (hosted by the Town of Shelter Island)
- Suffolk County DHS: Changes to wastewater practices effective July 1, 2019
- Suffolk County: Septic Improvement Program information
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