The exact same thing happened to me that happened to "Frustrated".  I am so annoyed at myself that I fell for this scam.  I totally thought this was a "welcome wagon" from the city where we just moved.  I had no idea.  Before the actual appointment, I started asking questions about how long the water test would take, and what they were looking for and they made it seem like a city-wide service.  The sales guy was very nice but stayed for an hour and a half.  My husband didn't get to see his children before they went to bed (he stayed downstairs with the sales guy while I put them to bed) and that is the only time he gets to see them all day.  I am SO annoyed.