Looking for a sinkhole investigation in Allentown, PA? Describe your project once and up to five geotechnical engineers who work in Allentown and Lehigh County get back to you with a quote. It's free and there is no obligation.
Allentown is home to about 127,138 people (2024 Census Bureau estimate), a growing community (+1.0% since 2020). With 7,238 people per sq mi, it is a densely built-up area. Karst geology makes sinkhole activity a real concern for some properties here.
Allentown at a glance
- Population (Census Bureau estimate, 2024)
- 127,138 (+1.0% since 2020)
- Rank in Pennsylvania
- 3rd of 1,013 cities and towns
- Land area
- 18 sq mi
- Population density
- 7,238 people per sq mi (densely built-up)
- Type
- City (Allentown city)
- Main county
- Lehigh County
What to check before hiring in Allentown
- License: in Pennsylvania, 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 Allentown
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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 Allentown
How much does a sinkhole investigation cost in Allentown, PA?
It depends on the site and the testing. Describe your property: engineers who serve Allentown 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 Allentown 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.