Geotechnical Boring

Geological Survey Program fact sheet
Missouri Geological Survey Division Director: Joe Gillman

The term “geotechnical boring” is used to cover numerous types of excavations. The purpose of this fact sheet is to clarify the types of geotechnical borings regulated by the Missouri Well Construction Rules.

What is a geotechnical boring?

A geotechnical boring is a temporary monitoring well used to collect or evaluate subsurface data to determine the properties of geologic materials such as type, chemical composition, compressibility, strength, thickness or structure.

What geotechnical borings are exempt from the rules?

What about soil borings?

Soil borings are the most common type of geotechnical boring. Soil borings are regulated by the rules as temporary monitoring wells.

Is a permit required to install geotechnical borings?

A non-restricted monitoring well drilling permit is required to install geotechnical borings that are not specifically exempted. See 10 CSR 23-1.090 for all drilling activities that require a permit.

What type of permit do I need if I only contract the geotechnical boring work to another company?

A restricted monitoring well permit is required to contract work that is not specifically exempted. The company doing the actual work must hold a non-restricted monitoring well drilling permit.

Do I have to plug geotechnical borings?

Geotechnical borings must be plugged within 30 days. Exceptions include:

It is recommended that exempted geotechnical borings be plugged. If uncertain whether a boring must be plugged, please contact the Well Installation Section for clarification before proceeding.

Is there a reporting requirement for geotechnical borings?

Geotechnical borings that are not exempted must report the plugging on the Monitoring Well/Test Hole/Soil and Geotechnical Boring Plugging Registration Report (form 780-2161). The registration report and fee must be submitted within 180 days of plugging the first boring. Reports may be submitted online at or by mail to Missouri Geological Survey, Well Installation Section, PO Box 250, Rolla, MO 65402. The report form also is available online at

What regulations pertain to geotechnical boring installation?

If you need assistance or have questions, please contact the Well Installation Section at 573-368-2165, or by email at

Water Well Driller’s Act can be found at

Missouri Well Construction Rules can be found at