A bill passed by the Missouri General Assembly and signed into law by the Governor in August 1994 addresses the protection of Missouri\'s groundwater (the source of much of our drinking water) and the prevention of the spread of disease organisms. The law governs sewage systems that treat and disperse wastewater, generally on the lot where it was produced - onsite systems.
The onsite sewage law covers soil absorption systems serving single or multiple residences or businesses with domestic wastewater flows of 3000 gallons per day or less and lagoons serving a single residence. The Missouri Department of Natural Resources (DNR) regulates all other sewage lagoons and sewage treatment facilities with daily flows of more than 3000 gallons, including public sewer systems. Anyone subdividing or developing property must comply with DNR residential development regulations as well as the onsite sewage law.
Under the law, the Department of Health and Senior Services (DHSS) has developed minimum standards for the size and location of sewage tanks and soil absorption trenches. County or city governments may adopt the state standards or stricter standards by ordinance.
Also under the law, DHSS lists persons who may conduct soils morphology evaluations for the design of onsite systems. In addition, DHSS provides training and registration for onsite system installers and licenses individuals to inspect or evaluate existing onsite sewage systems related to a real estate sale.
When a neighbor or other aggrieved person lodges a complaint about a failing system, the law provides for an investigation. If the system presents a nuisance or a health hazard, the nuisance must be abated. Major repairs, as well as new systems, must comply with minimum standards.
Missouri Department of Health and Senior Services\' (DHSS) rules governing onsite sewage systems cover minimum construction requirements, system inspections at the time of property sales, and requirements for soil evaluators. These rules became effective in January 1996.
In Dade County, the Local Public Health Agency, or DHSS staff, regulate new system construction and existing system repairs according to state standards. The state standards establish minimum requirements for the size and type of an onsite system based on an evaluation of the site and soil conditions. Dade County has approved a sewer ordinance that adopts Missouri regulations. There are no exemptions for property sizes. Percolation test are not acceptable for determining soil absorption designs.
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