This list includes Registered Installers who have indicated they work in this county. The list also shows some other counties served. For more registered installers, you can return to the map and check for installers that work in other nearby counties.

Any installer on this list can install basic OWTS. Advanced OWTS installers are noted with ADV and can install advanced OWTS. The requirements for advanced OWTS installers are effective July 1, 2005. There may be additional requirements to work in some counties. Contact the county onsite sewage authority to confirm that an individual can install systems in the county.

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Missouri Registered OWTS Installers List

Advanced Status Last Name First Name MI Date of Expiration Business Address City State Zip Code Business Phone Counties Served

Armstrong Mark D 9/30/2019 Armstrong Plumbing & Trenching 251 N. Martin Ave Kahoka MO 63445 (660) 727-2041 Clark, Scotland, Lewis, Knox
ADV. Dinwiddie Adam G 9/30/2020 A & C Excavating 13622 SawyerDr. New London MO 63459 (573) 795-6914 Marion, Pike, Monroe, Shelby Lewis Knox Audrain

Evans Eric S 3/31/2020 Double E Excavating 29000 Oak Avenue Maywood MO 63454 (573) 478-4485 Marion, Clark, Knox, Ralls, Lewis

Hettinger Joshua P 8/31/2019 Anchor Contractors LLC PO Box 816 Kirksville MO 63501 (660) 627-6262 Adair, Macon, Sullivan, Putnam, Knox
ADV. Horst Harold
7/31/2020 Horst Plumbing 52155 State Highway Y Baring MO 63531 (660) 892-4582 Knox, Scotland, Adair, Lewis
ADV. Janney Robert L 9/30/2019 Janney Builders Supply & Construction Inc 413 Lewis Street Canton MO 63435 (573) 288-3462 Clark, Knox, Marion, Monroe

Magers Andrew Dillon 9/30/2018 Drew Magers Construction 410 E Bates LaPlata MO 63549 (660) 341-7308 Macon, Adiar, Knox, Linn

Miller Edwin M 9/30/2020 Miller Trenching & Excavating 57176 State HWY T Knox City MO 63446 (660) 342-0321 Knox Adair Lewis Scotland Macon

Oberholtzer Marlin N 2/28/2018 Oberholtzer Plumbing LLC 347 S. Ridge St. Memphis MO 63555 (660) 465-8900 Scotland, Clark, Knox, Schuyler, Lewis

Paul William A 4/30/2018 Paul's Trenching & Backhoe RR 3 Box 20C Kahoka MO 63445 (660) 342-3437 Clark, Lewis, Scotland, Knox
ADV. Schmid Joe
4/30/2020 Schmid Construction 2303 Woodwind Ct Kirkville MO 63501 (660) 665-7859 Adair, Schuyler, Putnam, Knox

Tallmage Jonathan E 10/31/2020 Tallmage Plumbing, LLC 1720 Boyd Lane Columbia MO 65202 (573) 239-3829 Boone Callaway Stone Knox


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