The North Texas Municipal Water District (NTMWD) reports several companies are soliciting residents in area cities about services that offer water quality tests that may or may not be needed. Often the solicitors are from out of state and offer their own report conclusions on local water quality in order to recommend a product or service they sell.
If you are concerned about your water, the District recommends using an accredited agency to perform the necessary testing. Below are links to find those accredited in Texas and your area: