As for the health department, you don't have to be any particular age to speak to the health director. If you see something that makes you go hey, you are welcome to give a call. If it's credible then they send their people over, in this case they'd probably start with one of their underlings like one who deals with businesses directly (think those that work w food safety, pools etc) and if it is a water issue it might trigger your DNR or city water department to investigate too.
As for public health causing issues for your family, they will not. Their job is to help your community stay healthy, not to separate families because you're concerned about your health or well being that might question the local business. They have nothing to do about that unless they see something glaringly wrong or make them question a child's safety/wellbeing as they are also mandatory reporters to the state in regards to children. If you feel this place of business is indeed doing things hinky, a call is worthwhile, if they find nothing, sobeit, you made the attempt to notify.
