Soil and Septic Site Evaluators in St Louis, MO
27 licensed evaluators serving St Louis, Missouri.
27 Onsite Soil Evaluator
About soil and septic evaluations in Missouri
Missouri's construction rule (19 CSR 20-3.060) names two site evaluation methods -- a percolation test and a soil morphology evaluation -- and gives the administrative authority with permitting jurisdiction the power to decide which one your site needs. DHSS runs two matching registrations: a Registered Percolation Tester (DHSS-approved training course plus written and practical exams, or existing OSE/PE/geologist qualification) and a Registered On-Site Soil Evaluator, most commonly qualified as a soil scientist (15+ semester credit hours of soils coursework, 3+ specifically in soil morphology, then a written and field exam scored 70% or higher). Both registrations run on a 36-month renewal cycle with continuing education. Conducting either evaluation for OWTS design or installation without the required registration, or misrepresenting yourself as registered, is a class A misdemeanor under RSMo 701.053.
One verified Missouri operator (Show Me Soils, serving the area west of St. Louis including Franklin County) advertises $350 to $550 for the evaluation depending on location -- one operator's current price, not a market average; get quotes from two or three registered evaluators serving your county. The permit fee is separate and varies by jurisdiction: three counties checked directly charge $90 (Moniteau), $150 plus a separate $60 building permit (Monroe), and $510 (Boone) for new construction. There is no statewide flat fee.
Frequently asked questions
How many licensed soil and septic site evaluators serve St Louis, MO?
27 state-licensed evaluators are listed for St Louis in our roster, sourced from the Missouri licensing board: 27 Onsite Soil Evaluator.
How much does a perc test or soil evaluation cost in St Louis?
One verified Missouri operator (Show Me Soils, serving the area west of St. Louis including Franklin County) advertises $350 to $550 for the evaluation depending on location -- one operator's current price, not a market average; get quotes from two or three registered evaluators serving your county. The permit fee is separate and varies by jurisdiction: three counties checked directly charge $90 (Moniteau), $150 plus a separate $60 building permit (Monroe), and $510 (Boone) for new construction. There is no statewide flat fee. Larger parcels, difficult access, and rush requests price above the range.
How do I verify a Missouri evaluator's license?
Look up the evaluator on the Missouri Department of Health and Senior Services (DHSS), Onsite Wastewater Program license search at https://experience.arcgis.com/experience/5c6151e541b74668bbaad632725224fe.