Conn. Agencies Regs. § 25-128-39 - Diameter, depth, and yield of water supply wells

(a) All new water supply wells shall be of adequate diameter and depth to be capable of yielding the quantity of water required by the user. For the use of an individual household, a bedrock well shall be satisfactory when it is capable of :
(1) Yielding five (5) gallons per minute and , in a six inch well, has a storage available of seventy-five (75) gallons . In wells with a diameter other than six (6) inches, an equivalent storage shall be required;
(2) Yielding three and one half (3 1/2) gallons per minute and , in a six inch well, has a storage available of one hundred fifty (150) gallons . In wells with a diameter other than six (6) inches, an equivalent storage shall be required.
(3) Yielding two (2) gallons per minute and has a storage available of two hundred twenty-five (225) gallons . In wells with a diameter other than six (6) inches, an equivalent storage shall be required;
(4) Yielding one (1) gallon per minute and has a storage available of four hundred (400) gallons . In wells with a diameter other than six (6) inches, an equivalent storage shall be required; or
(5) Yielding one half (1/2) gallon per minute and has a storage available of six hundred (600) gallons . In wells with a diameter other than six (6) inches, an equivalent storage shall be required.
(b) Storage available shall be the volume of water from the level of the pump intake to the static water level of the well plus any usable water in a storage tank. Storage tanks may be provided using any combination of hydropnuematic tanks and non-pressurized tanks with booster pumps.
(c) Water supply wells yielding less than one half (1/2) gallon per minute shall be pump tested for at least eighteen (18) hours to prove the water supply well yield. It is not recommended that a water supply well with less than one half (1/2) gallon per minute of yield be used as the only supply for an individual household.
(d) In the event that the Board determines that a special or unusual geological, hydrological, or other circumstance exists in the construction of any well, the Board may determine the minimum requirements of diameter, depth, and yield for the water supply well and shall render a final decision. The decision of the board shall be the final decision in accordance with section 4-180 of the Connecticut General Statutes for purposes of reconsideration in accordance with section 4-181a of the Connecticut General Statutes or appeal to the Superior Court in accordance with section 4-183 of the Connecticut General Statutes.

Notes

Conn. Agencies Regs. § 25-128-39
Effective May 21, 1993; amended 7/8/2022

State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.