Skeat, if you and your daughter get water from different municipalities, you should be able to get a report from each one that tells what's in the water. I'm pretty sure the EPA requires an annual report from every municipality in the country and they have to be made available to the public.
The reports have to list the breakdown of everything in the water. For example, I find it interesting that our water contains a LOT of arsenic. It's slightly below the maximum amount allowed by the EPA and our water superintendent insists it's not dangerous, but one wonders. The arsenic basically comes from only one of the wells supplying our town; when our water plant was enlarged and improved none of the engineers could figure out why only one of the wells was affected.
The report has a name, but I can't think of it. If you go that route, I'll try to find out for you.
Sandy