Cesspools, Septic and Sewer in Greenport, NY

Short answer: Greenport has a village-run sewer system that is not fully represented in the county district layer.

Sewer coverage

Greenport has a village-run sewer system that is not fully represented in the county district layer. Greenport is an incorporated North Fork village in the Town of Southold, and county district polygons still read 0% active here despite village-operated service. Greenport runs a village sewer network in the North Fork core; county district polygons read as zero here, so the 626 one-family parcels still need parcel-level utility confirmation before any septic plan. For comparison, the nearest places: Greenport West (0% sewered, median lot 0.34 ac); Dering Harbor (0% sewered, median lot 1.70 ac); East Marion (0% sewered, median lot 0.49 ac). Because village-operated sewer service is only partly represented in county district polygons, active-share ranking is advisory for this page.

Greenport is a larger North Fork village footprint (0.93 sq mi) inside Southold, with moderate flood exposure (16% of mapped land) and a broader lot base (median 0.17 ac across 626 one-family parcels). Because village-operated service and county district layers do not map one-for-one, parcel-level utility confirmation is required before grant planning.

Groundwater, lots and flood exposure

Groundwater management Zone IV: 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. County parcel records show 626 one-family lots touching Greenport, with a median of 0.17 acres (about 7,600 sq ft), below that minimum and the 147th-largest median lot in our Suffolk table. 16% of the land is in FEMA's 1%-annual-chance flood zone.

For most Greenport 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 16% 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 Greenport

• Building permits: Village of Greenport
• System approvals and grants: SCDHS, 631-852-5700 (permits) / 631-852-5811 (grants)

Frequently asked questions

Is Greenport on public sewer?

The county layer shows 0% active district, but Greenport runs its own village sewer network.

Can Greenport 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 Southold overview, septic grants, replacement rules. More in Southold: Southold, Cutchogue.

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