Houston-Based
Geotechnical, Drilling,
Phase I ESA & CMT
Established in 1962
Supporting builders, engineers, and municipalities across Houston and Southeast Texas with the subsurface data, testing, and engineering their projects are built on.
Six Decades of Ground Truth
From single-lot builds to TxDOT corridors, clients call CTL because the data holds up — in the field, in the lab, and in the report.
- Field Reports Delivered Every Month
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- Feet Drilled in the Past Year
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- Geotechnical Reports Delivered in 2025
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Four Disciplines.
One Trusted Partner.
Geotechnical Engineering
Subsurface intelligence that drives sound design decisions.
Explore→Geotechnical Drilling Services
Our own rigs and crews — truck-mounted and all-terrain.
Explore→Environmental Site Assessment
Phase I & II ESAs that protect your investment.
Explore→Construction Materials Testing
ASTM-compliant testing backed by an accredited lab.
Explore→Field Exploration. Lab Testing. Engineering.
Field to Report, One Team.
From the first borehole to the final report: one team, one standard, one point of accountability.
- Single Point of Contact
- Faster Reporting
- Tighter Quality Control
- One Point of Accountability
Built for the People
Who Build Houston
From single-family developments in Katy to TxDOT infrastructure projects across Harris County — serving clients from Galveston to College Station and every community in between.
Home Builders & Developers
From lot development to final inspection, we provide fast, accurate testing and geotechnical support to keep residential projects on schedule and in compliance.
Civil & Structural Engineers
We partner with engineering teams to deliver reliable soil data, lab analysis, and foundation recommendations that hold up from design through construction.
Municipalities & Public Works
Our testing and geotechnical services support city and county infrastructure — roadways, drainage, and utilities — with dependable reporting and turnaround.
Industrial & Commercial Owners
We support plant, industrial, and commercial owners with geotechnical investigations and materials testing, and we’re ISNetworld prequalified for work on industrial sites.
The paperwork behind the promise.
We're hiring. Take pride in your work? Build something that lasts with us.
View open positions →Ready to start your project?
Tell us about your site and schedule, and we’ll put together a proposal for the testing and engineering it needs.