This list is not all inclusive; being listed on our website is optional. To verify registration status of an individual not listed, contact the Onsite Wastewater Treatment Program at 573-751-6095.

Click on a county in the map below to see a list of Missouri Licensed Onsite System Inspectors/Evaluators who serve that county. You may also check the surrounding counties.
List will display under the map.

If your contact information needs updated, please complete the Update Contact Information survey. We will process address corrections monthly and update those to the web page.

Also, a listing of Suspended or Revoked Onsite System Inspectors/Evaluators is available.

List will display under the map.