Conn. Agencies Regs. § 25-128-51
All new and repaired water supply wells, with the exception of repairs limited to well casing extensions, shall be tested for yield and capacity, as provided by section 19-13-B51k of the Regulations of Connecticut State Agencies, and all static and pumping water levels and well discharge shall be measured and recorded, with the pumping rate held constant. The test shall be made by one of the following methods: the pump method, the bailer-recovery method, the air rotary drill method, or the air lift method. For wells serving a single family the well may be tested for yield by removing as much water as is practicable from the well and measuring the rate of recovery. Geothermal bore holes for closed-loop geothermal systems are not required to be yield tested.
Conn. Agencies Regs. § 25-128-51