If you want specific numbers, you'll need to get a lab involved which will be more expensive. But to just detect the presence of contaminants, a cheap tester li

If you want specific numbers, you'll need to get a lab involved which will be more expensive. But to just detect the presence of contaminants, a cheap tester like available at hardware stores should work. An example: https://www.homedepot.com/p/Safe-Home-Do-it-Yourself-Lead-in-Water-Test-Kit-SH-PBDIY1/308899171 https://www.homedepot.com/p/Safe-Home-Do-it-Yourself-Lead-in...