Registered OWTS installers in Washington County, Missouri
96 companies on Missouri’s roster of registered onsite wastewater treatment system installers give Washington County as their address. A registered installer is a business the state has licensed for the work that installs onsite wastewater treatment systems.
- 3G Excavating LLC(573) 631-0603FarmingtonInstallerLicence expires May 31, 2028
- About Plumbing Inc(314) 607-1126BarnhartInstallerLicence expires January 31, 2026
- Accuro Services,LLC(314) 363-4793WentzvilleInstallerLicence expires December 31, 2027
- All Type Septic(573) 760-4734Valles MinesInstallerLicence expires October 31, 2026
- All Type Septic Pumping & Aeration LLC(573) 760-4734Valles MinesInstallerLicence expires January 31, 2027
- ASKR Construction, LLC(314) 422-9326Bonne TerreInstallerLicence expires February 28, 2026
- Backhoe Services Unlimited(636) 234-4790Villa RidgeInstallerLicence expires March 31, 2027
- BDG Contracting Inc(314) 478-2388St. LouisInstallerLicence expires January 31, 2028
- Benjamin R Zimmerman(573) 915-2353Doe RunInstallerLicence expires March 31, 2028
- Benoist Excavating LLC(573) 366-6113IrondaleInstallerLicence expires October 31, 2025
- Bo's Home InspectionsInstallerSoil evaluatorLicence expires September 11, 2027
- Bo's Home Inspections and Services LLC(573) 647-1913RollaInstallerLicence expires September 30, 2027
- Boren Contracting LLC(573) 330-3028Bonne TerreInstallerLicence expires November 30, 2025
- Bradford Excavating(636) 586-0076HillsboroInstallerLicence expires October 31, 2025
- Brown Service Co(314) 378-4088High RidgeInstallerLicence expires December 31, 2028
- C.Taylor Contracting LLC(636) 584-9077HermannInstallerLicence expires March 31, 2028
- Chad Queen Contracting Services, LLC(314) 960-1699DeSotoInstallerLicence expires April 30, 2028
- CJC Concrete(573) 854-0130CadetInstallerLicence expires December 31, 2026
- Clog Boss Drains and Septic(573) 482-0032Bonne TerreInstallerLicence expires July 31, 2026
- clubbs home remodeling(636) 228-3422ofallonInstallerLicence expires October 31, 2026
- Commercial Drain & Sewer Cleaning Inc(636) 282-1775ArnoldInstallerLicence expires February 28, 2028
- Courtney Construction LLC(417) 926-1479Mountain GroveInstallerLicence expires January 31, 2027
- CSO Environmental Services, Inc(217) 522-4085SpringfieldInstallerLicence expires March 31, 2027
- Custom Power Excavating, Inc(573) 774-7155RosebudInstallerLicence expires June 30, 2028
- Detring Septic Solutions LLC(573) 760-3993Park HillsInstallerLicence expires November 30, 2025
- Double R Plumbing and Contracting(573) 760-6768PotosiInstallerLicence expires May 31, 2027
- E&J Siteworks LLC(314) 225-8937DittmerInstallerLicence expires April 30, 2028
- Figler Excavating Inc(573) 468-3434SullivanInstallerLicence expires September 30, 2027
- G&S Hardin Excavation LLC(636) 208-4209DeSotoInstallerLicence expires March 31, 2027
- Girdner Contracting LLC(636) 266-8788Villa RidgeInstallerLicence expires May 31, 2026
- Gordon Bess Construction Inc(573) 358-5495Bonne TerreInstallerLicence expires August 31, 2026
- Griffin & Sons Excavating(314) 971-2157DeSotoInstallerLicence expires December 31, 2026
- Hickinbotham realty(636) 629-3419St ClairInstallerLicence expires January 31, 2027
- HP Savored LLC(573) 482-5366Park HillsInstallerLicence expires December 31, 2027
- Integrated Facility Services(314) 208-1760FentonInstallerLicence expires August 31, 2028
- J Wyatt Contracting(636) 274-1538DittmerInstallerLicence expires December 31, 2025
- J&B Ruessler Septic(636) 544-0825HillsboroInstallerLicence expires February 28, 2027
- Jarvis Plumbing(573) 438-2995PotosiInstallerLicence expires September 30, 2026
- Jay Rice Contracting(636) 629-6565St. ClairInstallerLicence expires March 31, 2028
- JB Digs, LLC(573) 366-5288BlackInstallerLicence expires May 31, 2028
- Jeffrey Cantwell(314) 803-3310St LouisInstallerLicence expires May 31, 2027
- JL Hicks Services, LLC(636) 337-5870DeSotoInstallerLicence expires July 31, 2027
- John's Excavating & Contractor(636) 274-4204Cedar HillInstallerLicence expires January 31, 2026
- Justin MurphyInstallerLicence expires April 30, 2027
- K&P Services LLC(816) 854-9091Blue SpringsInstallerLicence expires August 31, 2028
- Kaysinger Liquid Waste LLC(573) 885-3341CubaInstallerLicence expires April 30, 2026
- KCJW Enterprises LLC(573) 747-5323FarmingtonInstallerLicence expires July 31, 2027
- KP Enterprise LLC(573) 631-0100FarmingtonInstallerLicence expires October 31, 2025
- Land Co(314) 713-7884High RidgeInstallerLicence expires March 31, 2028
- Larry's Landscaping(314) 942-1029BarnhartInstallerLicence expires January 31, 2026
- LCG Legacy Contracting Group(314) 677-0525PacificInstallerLicence expires September 30, 2027
- Logsden Landshaping LLC(314) 640-2669PotosiInstallerLicence expires March 31, 2028
- Lord Plumbing LLC(573) 701-4734Bonne TerreInstallerLicence expires July 31, 2028
- Madonna's Septic & Sewer Solutions(314) 486-8241HillsboroInstallerSoil evaluatorLicence expires November 30, 2025
- Matt Girardier Excavating(636) 399-5247St ClairInstallerLicence expires April 30, 2028
- Midwest Septic & Maintenance Service LLC(573) 482-5835Park HillsInstallerLicence expires March 31, 2028
- Moore Works LLCInstallerLicence expires November 30, 2025
- Mots Excavation LLC(314) 974-5756HillsboroInstallerLicence expires November 30, 2028
- NewShu Contracting LLC(314) 578-0145LonedellInstallerLicence expires January 31, 2028
- Orrick Excavating & Construction(573) 546-3818MiddlebrookInstallerLicence expires May 31, 2026
- Outlaw Excavating LLC(636) 232-3860DeSotoInstallerLicence expires July 31, 2026
- Pinson Excavating(314) 420-5466CadetInstallerLicence expires September 30, 2028
- PJ Myers Hauling & Excavating, LLC(573) 885-4403CubaInstallerLicence expires October 31, 2028
- Pooles Septic System(573) 631-5927Mineral PointInstallerSoil evaluatorLicence expires July 31, 2026
- Pooles Septic Systems(573) 631-5927Mineral PointInstallerLicence expires June 30, 2027
- Prekins Branch Properties(314) 478-0456DeSotoInstallerLicence expires May 31, 2027
- Pristine Contracting Group(573) 430-8259Bonne TerreInstallerLicence expires May 31, 2026
- Pro-Com Septic & Excavation LLC(636) 222-8128Valles MinesInstallerLicence expires March 31, 2028
- Professional Onsite Installations(636) 236-4760HillsboroInstallerLicence expires June 30, 2028
- Ragsdale Asphalt/Excavating(573) 474-5906BismarckInstallerLicence expires March 31, 2027
- Riverbank Enterprises(573) 631-0932BellviewInstallerLicence expires December 31, 2027
- Rock of Ages(573) 241-2255CubaInstallerLicence expires December 31, 2027
- Ronnie's Dirt Work(314) 899-6555SteelvilleInstallerLicence expires November 30, 2025
- Ryan J Wallis(573) 209-1041BismarkInstallerLicence expires December 31, 2027
- Sam's Home & Commercial Inspectors(573) 202-6062VichyInstallerLicence expires August 31, 2028
- Schlett Construction(314) 302-6476BarnhartInstallerLicence expires March 31, 2026
- Schrum Masonry & Construction Inc(636) 586-2270DeSotoInstallerLicence expires August 31, 2026
- Second Nature Excavation and Hardscapes(573) 694-8696New HavenInstallerLicence expires March 31, 2028
- Septic Services, Inc.(636) 583-5564UnionInstallerLicence expires January 31, 2026
- Septic Solutions(314) 216-1937House SpringsInstallerLicence expires September 30, 2028
- Sewage Pump Solutions(636) 331-5172DeSotoInstallerSoil evaluatorLicence expires March 31, 2027
- Show Me Soils(636) 629-1788LonedellInstallerSoil evaluatorLicence expires April 30, 2026
- Sk hardin construction(636) 208-6533DesotoInstallerLicence expires March 31, 2027
- Steve RogersInstallerLicence expires May 31, 2027
- Straughan Plumbing and Septic(573) 315-0764FarmingtonInstallerLicence expires July 31, 2026
- Strothkamp Excavating LLC(314) 630-2184SullivanInstallerLicence expires May 31, 2028
- Superior Sewer Co(314) 931-4738St. LouisInstallerLicence expires July 31, 2026
- TJ Riley Contracting(573) 482-0032Bonne TerreInstallerLicence expires July 31, 2026
- Tongay Dirtworks LLC(573) 430-2711Park HillsInstallerLicence expires December 31, 2027
- Unlimited Landscape Maintenance(314) 210-8314FestusInstallerLicence expires March 31, 2028
- Volz Incorporated(314) 890-1264Saint LouisInstallerLicence expires December 31, 2026
- Wagner Tree Trimming & Trenching(636) 629-1842LonedellInstallerLicence expires March 31, 2026
- Wiese property improvements(573) 569-2060SullivanInstallerLicence expires March 31, 2027
- Wiggs Plumbing LLCInstallerLicence expires September 30, 2026
- William E Courtway/Redline Junk Removal & Dumpster(573) 210-0966CadetInstallerLicence expires December 31, 2026
- William H. Bond Engineering(573) 483-2175Ste. GenevieveInstallerSoil evaluatorLicence expires March 31, 2026
What “Registered OWTS installer” means in Missouri
Being on this roster means Missouri DHSS has licensed this business for installs onsite wastewater treatment systems. It is not a rating, a review, or a statement about price, insurance or workmanship.
Registrations carry an expiration date, shown on every listing. The state republishes the dataset as registrations change.
Before you hire, confirm the licence with Missouri DHSS, or the state's own published registration data. How to verify →
Registered OWTS installers in neighbouring counties
Records as published August 26, 2026. Report a correction.