Well water testing guides.

Find the fields on your lab report, check the units and identify the source behind a comparison value.

• How to Read Well Water Test Results: Units, ND and Limits

  Read an example report and understand units, ND, nitrate labels and the different EPA references.

• Coliform Bacteria in Well Water: What a Positive Test Means

  Positive coliform result on your well test? Learn what total coliform, fecal coliform and E. coli mean, what the CDC advises, and who to call.

• Nitrate in Well Water: What "As N" Means on Your Report

  Nitrate in well water explained: what "as N" means on a lab report, which EPA reference applies, and why EPA guidance mentions infants under six months.

• How Often to Test Well Water: Routine and Event Checks

  How often to test well water: compare CDC's yearly test list with events that call for testing, and see what to ask your certified lab or health department.