Suffolk County steep-slope & wetlands.
Suffolk County runs two glacial moraines out to Montauk, with sea-facing bluffs on the North Shore and at the East End that erode and slump — slope in a form unique to Long Island. The Peconic estuary, South Shore bays, and Pine Barrens ponds put mapped wetlands on an outsized share of parcels.
PARCEL DATA ✓Suffolk County publishes tax-parcel boundaries, so you can zoom into the map, click any parcel — or several — and analyze it instantly. Searching by tax ID (SBL) or address works too.
WHAT YOU GET FOR ANY SUFFOLK COUNTY PARCEL
Steep-slope share
Percent of the parcel over any slope threshold you pick, from USGS 3DEP 1 m LiDAR (Horn 1981) — re-thresholdable live.
Wetland acreage
DEC-regulated, Army Corps / NWI, and informational freshwater wetlands measured inside the boundary.
PDF & CAD export
A clean report, or a georeferenced DXF/DWG with slope contours and wetlands on labeled layers.
NEARBY IN LONG ISLAND
Sources: USGS 3DEP elevation, NYS Tax Parcels, NYS DEC Environmental Resource Mapper. Results are planning-level estimates from public GIS data — not a survey, jurisdictional determination, or wetland delineation.