Honolulu, Hawaii — Hawaii homeowners face a very low risk of sinkholes, with experts saying true sinkhole formation is rare across most of the islands.
According to the U.S. Geological Survey, Hawaii’s geology differs significantly from states where sinkholes are common. The islands are primarily composed of volcanic rock rather than widespread limestone or other highly soluble formations typically associated with sinkhole development. As a result, naturally occurring sinkholes are uncommon and generally limited to very specific, localized conditions.
Geologists note that while sinkholes are rare in Hawaii, ground-related issues can still occur for other reasons. Localized subsidence, soil erosion, lava tubes, coastal erosion, or collapses tied to underground voids formed by volcanic activity can sometimes be mistaken for sinkholes, even though the underlying cause is different.
True sinkholes, when they do occur, usually develop gradually. Experts emphasize that surface changes often provide early indicators of underground movement long before a collapse happens, even in states with very low sinkhole risk.
Homeowners who notice shallow depressions forming in yards, soil that feels unusually soft, or unexpected pooling water are encouraged to document those changes. Cracks appearing in sidewalks, driveways, patios, or foundation walls can also reflect subtle ground movement rather than routine settling, particularly if they worsen over time.
Other warning signs may be dismissed as normal wear. Leaning fences, separating steps, tilting trees, or gaps opening between soil and concrete surfaces can sometimes point to localized ground instability related to erosion, drainage, or subsurface voids.
In Hawaii, most ground changes are highly localized and often linked to volcanic features, coastal processes, heavy rainfall, or soil erosion rather than natural sinkhole processes. Experts stress that risk can vary by neighborhood depending on island geology, drainage patterns, and development history.
The USGS advises homeowners not to fill or cover unexplained depressions if changes persist or worsen, as doing so can hide underlying issues and delay proper evaluation by local officials or qualified professionals.
Experts stress that awareness — not alarm — remains the best approach. Even in states where sinkholes are rare, early attention to subtle ground changes can help prevent property damage and improve safety.
