You should understand as much as possible whether you are purchasing a property with a well, own a property with a well or are planning to drill a well. The Arizona Department Of Water Resources has a good deal of information regarding wells in Arizona. Their WEB site is http://www.water.az.gov/dwr/.
Here are some more good links to AZ wells, digging, etc.:
There is a wealth of information available if you Google "Arizona" & "Water wells"
Emmanuel J. Scanlan
PS Inspection & Property Services LLC
TREC License # 7593
International Code Council, Residential Combination Inspector #5247015-R5 (Electrical, Mechanical, Plumbing and Building)
Certified Level I Thermographer (ASNT-TC1A Standards)
Texas Residential Construction Commission, Third Party Warranty Inspector #1593
Texas Residential Construction Commission, Inspector, County Inspection Program
Texas Department Of Insurance, VIP Inspector # 08507061016
Hayman Residential Engineering Services, Field Technician
CMC Energy - Certified Energy Auditor
Knowledge is power, but sharing knowledge brings peace!!
Emmanuel gave you some great information, all you can do now is make sure you check everything out and get all your question answered by the Pro's.
What I mean by Pro's is the people that specialize in Az. Water Wells, sometimes we don't know what questions to ask, so talk to the Pro's and read everything you can before you make a purchase of a home that has a well.