dont like repeat customers then agile
To be honest, I wouldn't want a repeat customer who is happy having one of those installed on the main anyway.
Professionally it's called due diligence, it isn't right, it isn't allowed for a very good reason and if the water authority want them reported then fair enuf. Our country has excellent water systems for a reason and it's blatant abuse like this that drags it down and wrecks it for everyone else.
Fit them properly, then there's no issue, fit them to the mains cause they don't give a schit and wont spend the money then don't be surprised if the water authority chaps the door and wants it removed or the water's getting shut off.