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.
We got the card and thought it maybe a legitimate welcoming company, obviously it is not.
I got a call back (before looking them up and finding this page) The lady said I had talked to someone yesterday, which I knew was BS because I had not and actually had to leave a message on their vm (mistake on my part). Once Ifound out it was water treatment, I said we were not interested. She kept pushing it, I said not interested and hung up.
If you want to sit through a sales pitch up to you. If not do not reply to a call or the card they send you.