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 Onsite System Registered Installers who serve that county.
List will display under the map.

Contact Us if you have questions about this list, or to update or correct an address.

Also, a listing of Suspended/Revoked Installers is available.

List will display under the map.