Sinkhole Risk in Tallahassee

Yes: the Florida Geological Survey states that no part of Florida, Tallahassee and Leon County included, is free of sinkhole risk because the whole state is underlain by carbonate rock (Florida Geological Survey).

The survey, a division of the Florida Department of Environmental Protection, says risk is considerably higher where limestone is close to the surface, or where the water table and aquifer layout favor collapse. Its advice to home buyers, in Tallahassee as anywhere in Florida, is blunt: the only way to be sure of avoiding property that might be susceptible is not to buy in a karst region, and buyers should learn the local geology and find out whether an area is karst (Florida Geological Survey).

The survey also notes that most Floridians are never affected by a developing sinkhole, and that holes make headlines mainly when a road or house sits on top of one. In Tallahassee the karst is easiest to see in two public places: Porter Hole Sink in Lake Jackson on the north side of town (Florida DEP) and the Leon Sinks Geological Area off US 319 to the south (USDA Forest Service).

No official map marks Tallahassee sinkhole risk areas street by street, and the Florida Geological Survey says no government agency or private company keeps a database of every sinkhole in Florida (Florida Geological Survey).

What exists for Tallahassee and Leon County is the survey's database of reported subsidence incidents, which runs from 1954 to the present and can be viewed on DEP Map Direct or the DEP GIS Open Data Portal. Most of those reports were never field-checked, so a dot on the map is a report, not a confirmed sinkhole. Reports also cluster where people live and drive, while holes in fields and forests often go unreported (Florida Geological Survey).

Under the survey's definition, a reported sinking in Tallahassee or elsewhere is a subsidence incident when its cause has not been confirmed by a licensed geologist or engineer; buried debris, broken pipes and poorly compacted fill can mimic a sinkhole (Florida Geological Survey). Last verified: October 15, 2026, on the Florida Department of Environmental Protection website.

Lake Jackson drains at Porter Hole Sink, a 28-foot-deep cavernous sinkhole near Faulk Drive Landing in north Tallahassee (Florida DEP Lake Jackson Aquatic Preserve).

DEP says the sink is always draining, even when covered with water, and has disappeared and refilled dozens of times in recorded history. DEP calls the event a dry down: part of Lake Jackson drains naturally and cyclically after prolonged drought, a lack of heavy local rain and evapotranspiration. Porter Hole has drained many times since June 2021. After an inundation period from December 2023 to October 2025, when the lake returned to average levels, Porter Hole is once again drained (Florida DEP).

The low water has closed most Lake Jackson boat ramps to motorboats. In October 2026 only Crowder Landing and Cedar Hill Landing remain open to motorized vessels, and DEP warns that anything larger than a small mud boat or airboat is likely to get stuck. Paddlers can still launch at Sunset, Miller, Jackson View and Gardner landings, while Faulk Drive Landing is limited to wildlife viewing (Florida DEP). The Lake Jackson Aquatic Preserve, designated in 1973, covers 5,130 acres including Carr Lake and Mallard Pond.

The Leon Sinks Geological Area, right off US 319 south of Tallahassee in the Apalachicola National Forest, has 5 miles of trails past a series of sinkholes, for $5 per vehicle (USDA Forest Service).

The 3.6-mile Sinkhole Trail passes the main sinkholes and other karst features, the 2.8-mile Gum Swamp Trail circles a cypress and gum swamp, and the 0.5-mile Crossover Trail joins them into a 4.4-mile outer loop. The Forest Service describes the Leon Sinks ground as limestone dissolved by rainwater and groundwater into caverns, holes and tunnels, with wet sinkholes, natural bridges and a disappearing stream (USDA Forest Service).

Leon Sinks opens 8 a.m. to 8 p.m. from April 1 to September 30 and 8 a.m. to 6 p.m. from October 1 to March 31. Swimming is not allowed, to protect the sinkhole walls and for personal safety. As of the Forest Service update of October 14, 2026, the site is only partially open during improvements, trails are open up to the trail blockers, and unscheduled closures are possible, so a call to the National Forests in Florida office in Tallahassee at 850-523-8500 before a trip is worthwhile (USDA Forest Service).

Sinkholes around Tallahassee are most likely when a dry spell ends and normal rain returns, because the Florida Geological Survey finds activity greatest after drought followed by a return to normal rainfall (Florida Geological Survey).

The survey explains why. When drought or heavy pumping lowers the water level in the limestone aquifer under Tallahassee, voids that held water fill with air instead. Water gives some buoyancy that holds the overlying material up; once the void holds air, a large rain event can weigh the soil down until it collapses into the cavity (Florida Geological Survey).

Tallahassee, like the rest of Florida, can see any of the three kinds of sinkholes the survey describes: solution sinkholes where limestone is near the surface, cover-subsidence sinkholes that form slowly as sediments ravel into voids, and cover-collapse sinkholes that open suddenly. After a sudden collapse, slumping of the sides may take about a day to stop, and erosion of the edge can continue for several days, longer with heavy rain (Florida Geological Survey).

A Tallahassee homeowner who finds a hole should mark and secure it, keep children and pets away, keep water out of it, and call the property insurance adjuster at once if a building shows sinking, sagging or cracking walls (Florida Geological Survey).

The Florida Geological Survey says small holes often need only clean sand or soil, and anyone inside a building with cracking walls should get out. Local government and emergency management offices may help assess damage, and the survey asks that the incident be reported to it for the subsidence incident database (Florida Geological Survey). Its helpline is 850-245-2118, the same number DEP lists for its headquarters at 3900 Commonwealth Boulevard in Tallahassee (Florida DEP). The survey warns that if anyone may be hurt, the first call is to local law enforcement.

For a lot in Tallahassee that has not had a hole yet, licensed geologists or engineers can look for buried cavities with ground-penetrating radar, electrical resistivity surveys and soil borings, but results are not always conclusive and the cost is often beyond a typical homeowner's budget (Florida Geological Survey). Insurance questions about sinkhole claims go to the Florida Department of Financial Services Division of Consumer Services (Florida Geological Survey).

Every property insurer in Florida, including those writing Tallahassee homes, must cover catastrophic ground cover collapse, while broader sinkhole loss coverage is offered for an additional premium (Section 627.706, Florida Statutes).

For a Tallahassee home, as for any Florida property, Section 627.706 of the 2026 Florida Statutes says a catastrophic ground cover collapse needs all four of these: the abrupt collapse of the ground cover, a hollow in the ground cover clearly visible to the naked eye, structural damage to the covered building including the foundation, and the structure being condemned and ordered vacated by the governmental agency with that authority. The statute adds that damage consisting merely of the settling or cracking of a foundation, structure or building is not a catastrophic ground cover collapse loss (Section 627.706, Florida Statutes).

Insurers may attach a sinkhole deductible of 1, 2, 5 or 10 percent of the dwelling limit, with premium discounts for each, and may limit both coverages to the principal building (Section 627.706, Florida Statutes). Tallahassee buyers comparing policies can ask which of the two coverages a quote includes.