How do you know that this testing isn't anything other than a facade? Where I live, they do the same thing. You get a water quality report in the mail a couple

How do you know that this testing isn't anything other than a facade? Where I live, they do the same thing. You get a water quality report in the mail a couple of times a year. However the level of the one thing that's most likely to be a problem here (PCBs) is not included.