I lived in Mesa, Arizona as a child in Maricopa county. A friend of my mother's visited my house and told my family that the area was built on top of an indian burial ground. As she was speaking the T.V. turned on and things in the garage began to fall. Things soon took a turn for the worse and my dad saw a full body apparition of what he believed to be a Native American man. Coincidence? I think not.
You could always ask the tribal nations, I don't think the county would have records dating back far enough for a conclusive report on the entire history of the area. Most of this ground is a clay like substance once you go down about a foot. But, you can see how many archeological artifacts turn up thousands of years later at some of the digs in Egypt or Rome. I would imagine that between the U.S. Government and the Indian Tribal Committee's, they have some records of sacred land that cannot be disturbed.
I was speaking to someone yesterday who is experiencing some strange stuff in her house and she made it a point of stating that the next house she purchase, she will be checking into the history of home/land. I became concerned because of the amount of Indian reservations/land and possible burial grounds that maybe around. I surely do not want to end up in a haunted house somewhere developers built on and disturbed some sacred grounds.
To the best of my knowledge, most of the Native American settlements were in the area of what was Maricopa Wells which is close to what we call M Mountain. It's about 7 miles East of Maricopa. Where, in fact, there burial grounds are is anybody's guess but I doubt that they were in the Maricopa City limits.
I have not heard of this but if you are looking to purchase a home in Maricopa and that is a concern of yours then I would suggest researching that information on the Pinal County website. That website is probably your best source of information on the subject.