This is a law GAGwP got passed after having an Attorney General Opinion written on it which basically says that if you have a Water Well Drillers license, you do NOT need a plumber's or electrician's license do complete your well work.  

See exact wording below.

GEORGIA CODE
Copyright 2016 by The State of Georgia
All rights reserved.

*** Current Through the 2016 Regular Session ***

TITLE 12.  CONSERVATION AND NATURAL RESOURCES  
CHAPTER 5.  WATER RESOURCES  
ARTICLE 3.  WELLS AND DRINKING WATER  
PART 3.  WATER WELL STANDARDS

O.C.G.A. § 12-5-131.1  (2016)

§ 12-5-131.1.  Licensing requirements for drilling well on own property; water well contractors completing electrical or plumbing work incidental to drilling and construction of well 


   (a) Nothing in this part shall prohibit a person from drilling a well on his or her own property if such property is his or her primary residence. A person is prohibited from drilling a well or wells on property he or she owns and is developing for resale unless such person has a license as a water well contractor.

(b) Notwithstanding any other provisions of law, a person licensed as a water well contractor pursuant to Code Section 12-5-127 is not required to be licensed under Chapter 14 of Title 43, when in the course of constructing a water well, he or she makes certain electrical or plumbing connections or performs other electrical or plumbing work incidental to the drilling and construction of the well; provided, however, that any such electrical and plumbing work meets or exceeds all applicable local, state, or federal codes, whichever is most stringent.

HISTORY: Code 1981, § 12-5-131.1, enacted by Ga. L. 2001, p. 315, § 7.