Private Drinking Water ← Knowledge Base What are the main types of groundwater wells? How many private drinking water wells are there in Missouri? When should I have my well tested? Who can test my private well water? How much will testing cost? What should I have tested? How do contaminants (bacteria and chemicals) get into my well water? I don’t understand the laboratory report, what do the numbers mean? What are drinking water standards? I would like my water sampled for a chemical the SPHL does not test for. Now what? Can my well be condemned if my water test results indicate chemicals/bacteria? My laboratory report says bacteria is present in my sample. Now what do I do?