Novarly Parcel · Long Island

Is Massapequa sinking?

What satellite radar actually measures across Massapequa — and what it means for your address.

-1.48 mm/yr
median ground motion
-3.28 mm/yr
fastest-sinking spot
0.1%
of measured spots moving ≥3 mm/yr

Across 1,203 measured locations in and around Massapequa, the median ground motion is -1.48 mm/yr (negative = sinking). The fastest-moving measured spot is subsiding at -3.28 mm/yr, and 0.1% of measured locations exceed the 3 mm/yr "notable" threshold. Rates vary block by block — check your exact address:

Screening only — not a structural guarantee. For any decision, consult a licensed geotechnical engineer.

More in Long Island:

HempsteadLong BeachBabylonIslipHuntingtonFreeport

Statistics computed from Ohenhen (2025) NYC–Long Island vertical land motion (Zenodo doi:10.5281/zenodo.17644691, CC-BY-4.0). Screening only — see methodology.