The Missouri Department of Natural Resources describes a Well Driller business as:

Individuals must test and become licensed/ permitted in order to do business in Missouri to construct a water, heat pump or monitoring well. Permitted contractors also may plug abandoned wells. 

You may need some or all of the following permits for a Well Driller business:

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Apprentice Well and Pump Installation Contractor Permit

In Missouri, a permit is required for anyone working on water wells, monitoring wells, pumps, heat pumps or drilling test holes. If you plan to become a permitted non-restricted well or pump installation contractor, you must first obtain an Apprentice Well and Pump Installation Contractor Permit. For more information, visit the department's Well and Pump Installation Contractor Permitting webpage.

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Non-restricted Well and Pump Installation Contractor Permit

In Missouri, a permit is required for anyone working on water wells, monitoring wells, pumps, heat pumps or drilling test holes. If you have apprenticed for two years and performed the required number of installations to drill, construct, repair, reconstruct, plug wells or install water well pumps, you may now apply for a Non-restricted Well and Pump Installation Contractor Permit. For more information, visit the department's Well and Pump Installation Contractor Permitting webpage.

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Restricted Well and Pump Installation Contractor Permit

In Missouri, a permit is required for anyone working on water wells, monitoring wells, pumps, heat pumps or drilling test holes. If you are planning to contract or subcontract work to drill, construct, repair, reconstruct or plug water wells or install water well pumps, you may need to apply for a Restricted Well and Pump Installation Contractor Permit. For more information, visit the department's Well and Pump Installation Contractor Permitting webpage.

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Solid Waste Technician Certification

Missouri solid waste disposal areas and solid waste processing facilities designated by rule, must be operated under the direction of a certified solid waste technician. For more information, please visit the department's Solid Waste Technician Certification webpage.