Printable Well Water Testing Checklist

A one-page checklist of what to test, when to test and what to do with the results, based on CDC guidance.

Print this checklist

Test every year

• Total coliform bacteria (CDC)
• Nitrates (CDC)
• Total dissolved solids (CDC)
• pH (CDC)
• Ask your local health department which other germs or chemicals to test for where you live. (CDC)

Also test when

• You hear about well water problems in your area. (CDC)
• There is flooding, land disturbance or a waste site near your well. (CDC)
• You replace or repair any part of your well system. (CDC)
• The water’s taste, color or smell changes. (CDC)
• Someone in the home becomes pregnant, or a child comes to live with you. (CDC)

Testing and results

• Use a state-certified laboratory. (CDC)
• If results show harmful germs or chemicals, consider bottled water or another safe source, and contact your health department. (CDC)
• Lab used:   Date:
• Only choose treatment after testing. Use the treatment selector with your results.

General guidance with sources linked on each line. Your state and county rules come first.