0815415c____Code_of_Federal_Regulations__Requirement
[Deadline] By January 1, 2007; your UIC Program Director may extend the closure deadline, but not the permit application deadline, for up to one year if the most efficient compliance option is connection to a sanitary sewer or installation of new treatment technology. [Requirement] 
(ii) If your well is in an other sensitive ground water area, you must close the well or obtain a permit
eCFR — Code of Federal Regulations
Requirement