Senate backs updating septic rules to soil‑morphology tests; statewide registration and fees set out

The Senate declared a substitute for Senate Bill 914 perfected Tuesday, approving a package of changes that would modernize how Missouri evaluates on‑site septic systems.

What the substitute would do
Senate Substitute for SB 914 would phase the state away from percolation/permeability testing — a largely 1995 standard — toward soil‑morphology or "soil properties" evaluations that examine soil texture, structure, color and depth to assess long‑term treatment capacity. Sponsors told the chamber that morphology evaluations probe deeper (up to roughly five feet) and consider profile characteristics that a shallow percolation hole can miss, such as a hard clay or rock layer beneath the surface.

Implementation, registration and fees
The bill directs the Department of Health and Senior Services to adopt rules defining qualified on‑site soil evaluators and to create a registry. That list would include geologists, soil scientists and licensed sanitarians; local health officials and contractors could pursue required training and registration. The substitute allows a transition period: if a morphology evaluator cannot reasonably be obtained, a percolation test may be accepted at the administrative authority’s discretion. Sponsors also said new permit and application fees will be calibrated so the program covers its administrative costs rather than generating general revenue.

Why proponents support the change
Supporters, including county officials and plumbing professionals who testified in committee, said morphology tests reduce the chance of installing a failing drainfield that appears acceptable on a shallow perc test. Senators cited rural districts where inaccurate perc results forced homeowners into costly lagoon systems or unnecessary repairs.

Concerns and safeguards raised
Several senators asked about regional soil variability and potential unintended consequences for sensitive watersheds and cave systems. The sponsor said the morphology approach is superior because it treats the soil profile rather than a single short‑term water infiltration reading and pointed to a provision that allows percs temporarily where morphology expertise is unavailable. The fiscal note reported no direct fiscal impact anticipated but bill language authorizes reasonable fees to fund program administration.

Outcome and next steps
Senate Substitute for SB 914 passed perfection on voice vote and was ordered printed. Senators signaled willingness to consider targeted amendments on local impacts and to monitor implementation details in rulemaking.