Conn. Agencies Regs. § 25-128-41a – Location of closed-loop geothermal systems

(a) The following are the separating distance specifications for all closed-loop geothermal systems. Distances cited are minimum separating distances based on horizontal measurements. Non-vertical closed-loop geothermal bore holes shall maintain the minimum separation distances when measured from any point along the borehole.
1. (1) Separating distances to subsurface sewage disposal systems shall be as prescribed in Section II of the Technical Standards for Subsurface Sewage Disposal Systems published by the Commissioner of Public Health pursuant to section 19-13-B103d(b) of the Regulations of Connecticut State Agencies.
2. (2) 25 feet from a below ground tank containing a non-hazardous substance. 50 feet from a below ground tank containing a hazardous substance.
3. (3) 10 feet from surface water or groundwater drainage structures or piping, water supply piping, public sewer laterals or mains, and fuel or utility piping. Stone below a foundation floor is not considered part of the groundwater drainage system relative to this separation distance.
4. (4) 10 feet from the high water mark of any body of water, except when the subject body of water is employed in a closed-loop geothermal surface water system.
5. (5) 50 feet from a private well or a semipublic well. The distance may be reduced to be no closer than 25 feet from a non-borehole system. When a closed-loop geothermal system is located on the same property as a private well or semipublic well, the distance may be reduced to be no closer than 25 feet to such private well or semipublic well.
6. (6) 75 feet from a public well with a withdrawal rate of less than 10 gallons per minute. Such distance shall not be reduced.
7. (7) 150 feet from a public well with a withdrawal rate of 10 to 50 gallons per minute. Such distance shall not be reduced.
8. (8) 200 feet from a public well with a withdrawal rate greater than 50 gallons per minute. Such distance shall not be reduced.
(b) Sources of pollution, for the purposes of this section, shall not include curtain drains, foundation drains, gutter drains, and similar drains that may carry water.

(Effective July 8, 2022)