Construction of Vertical Loop Wells for Geothermal Heat Pump Systems

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The National Ground Water Association believes the grout and the loop tube are integral parts of the loop well and that qualified individuals, such as a Certified Vertical Closed Loop Driller (CVCLD), should be authorized to construct a loop well. Construction of a geothermal heat pump loop well includes, in continuous order, drilling of the vertical borehole into the Earth, placement of the loop tube to the bottom of the vertical borehole with the grout tremie, and grouting of the vertical borehole from the bottom of the vertical borehole to the Earth’s surface. When these three steps are completed, the vertical borehole may now be considered a loop well. Loop emplacement and grouting should be performed in a timely manner to guarantee successful loop tube placement, grout installation, and environmental protection.

Document Type: 

  • Position Statement


  • critical issues, database publication, water, geothermal, energy