The CT Dept. of Public Health convened a Private Well Water Task Force in 2016 - as of this posting (7-21-16), no recommendations have been published by the task force.
About 15% of the state's population is served by private drinking water wells.
See the June 30, 2009, Report to the Legislature: Ensuring the Adequacy and Purity of Private Wells in Connecticut.
Conn. Gen. Statutes Sec. 19a-37, governing regulation of water supply wells (as of 1-1-2013).
Check with your land use or environmental counsel for any updates to laws and regulations.