Following reports from concerned Minnesotans, the Minnesota Department of Health is warning consumers to beware of false claims, deceptive sales pitches, inaccurate water quality data and scare tactics used by some water treatment companies to sell expensive and unnecessary home water treatment units. They say a common tactic is for a salesperson to offer a free water test and then claim that some substances found in the test are above allowable limits for drinking water. Companies have also falsely implied that they are working with utilities or the state health department. Most Minnesotans, according to the health departmen, do not need to install home drinking water treatment. Contact authorities if you believe you have encountered a scam.