The usual test-your-water scam is to demonstrate your water is substandard and to talk you into buying their water treatment system which typically costs 5-10 $thousand. You can get the equivalent or better system from a local store for much less $$$.

I received a similiar post card yesterday stating I could get a free 50 oz bottle of tide if I called this number.  Call the number and they want to bring the bottle to you and test your water.  I work for a water treatment company and this is one of the ultimate scams.  If companies, if they are even legit, have to stoop so low to get into peoples homes they should just give up.  The sad part is elderly people will let them come.  They end up buying all sort os stuff they don't need.  Sad sad world this has become.

just received this post card in the mail stating I have a housewarming gift that they are trying to reach us.  Yeah right!!!  i also received two more post cards from two different people in the mail also.
Scam written all over this!!!!