How do you know who to pay to? Sure, you are paying for the every drop of water, but what if you really wanted to pay for water from a specific region, doesn't

How do you know who to pay to? Sure, you are paying for the every drop of water, but what if you really wanted to pay for water from a specific region, doesn't want water from another region, and trust that the water company does not keep a cut or rip off either of you?