Looking for a sinkhole investigation in St. Augustine, FL? Describe your project once and up to five geotechnical engineers who work in St. Augustine and St. Johns County get back to you with a quote. It's free and there is no obligation.
St. Augustine is home to about 16,033 people (2024 Census Bureau estimate), a growing community (+12.0% since 2020). With 1,684 people per sq mi, it is a suburban area. Karst geology makes sinkhole activity a real concern for some properties here.
St. Augustine at a glance
- Population (Census Bureau estimate, 2024)
- 16,033 (+12.0% since 2020)
- Rank in Florida
- 142nd of 411 cities and towns
- Land area
- 9.5 sq mi
- Population density
- 1,684 people per sq mi (suburban)
- Type
- City (St. Augustine city)
- Main county
- St. Johns County
What to check before hiring in St. Augustine
- License: in Florida, investigations are signed by a licensed engineer or geologist.
- Insurance: read your policy's sinkhole and ground collapse wording before you file.
- Report: ask for radar results, boring logs and clear conclusions.
- Price drivers: site size, number of borings and testing.
Useful official resources
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USGS: sinkholes
Official information and guidance.
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Florida Office of Insurance Regulation
Official information and guidance.
Services available in St. Augustine
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Sinkhole investigation
Geotechnical investigation with ground penetrating radar and borings, and an engineer's report.
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Sinkhole repair design
Engineering design and oversight of grouting or underpinning repairs.
Frequently asked questions in St. Augustine
How much does a sinkhole investigation cost in St. Augustine, FL?
It depends on the site and the testing. Describe your property: engineers who serve St. Augustine reply with a quote.
How long does it take?
Often a few weeks including field work and report.
Can a sinkhole be repaired?
Often yes, by grouting or underpinning designed by an engineer.
Which geotechnical engineers will contact me?
Up to five independent geotechnical engineers who serve St. Augustine and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.