I recall seeing free home water testing kits in home depot a while back. Not sure what those kits tested for but they were a means to sell you home filtration systems and plumbing stuff. But they were free. Maybe start there?
Afaik it’s just a way to invite a sales call. @dingus, just get an inexpensive water test kit from Amazon or wherever. Also, you should be able to get water quality reports and other information about your water supply from the municipality.