Short answer: About 100% of Lindenhurst's land falls inside Southwest Sewer District, an active district on the county map.
Lindenhurst in numbers
| Town | Town of Babylon |
|---|---|
| Village | Village of Lindenhurst |
| Area | 3.71 sq mi |
| In active sewer district | 100% · Southwest Sewer District |
| In proposed district | 0% |
| Groundwater zone | Zone VII 100% |
| FEMA flood zone | 12% |
| One-family lots | n/a (Town of Babylon parcel records don't use NYS class 210) |
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
About 100% of Lindenhurst's land falls inside Southwest Sewer District, an active district on the county map. That still leaves pockets of Lindenhurst where homes were never connected and run cesspools or septic tanks. For comparison, the nearest places: North Lindenhurst (100% sewered); Copiague (100% sewered); West Babylon (80% sewered). By active-sewer share Lindenhurst ranks 5 of the 165 Suffolk hamlets and villages we measured.
Groundwater, lots and flood exposure
Groundwater management Zone VII: Article 6's minimum lot for a new home on an on-site system here is 20,000 sq ft, unless the density is met another way or an exemption applies. 12% of the land is in FEMA's 1%-annual-chance flood zone.
If your Lindenhurst street isn't connected, the same county replacement and grant rules apply as anywhere in Suffolk. 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 Lindenhurst
- Building permits: Village of Lindenhurst
- Sewer: Southwest Sewer District
- System approvals and grants: SCDHS, 631-852-5700 (permits) / 631-852-5811 (grants)
Frequently asked questions
Is Lindenhurst on public sewer?
Mostly: about 100% of Lindenhurst's land is inside Southwest Sewer District, but not every home inside a district is connected.
Can Lindenhurst 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 Babylon overview, septic grants, replacement rules. More in Babylon: Deer Park.
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 Lindenhurst?
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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