Onsite Wastewater Treatment System Requirements

An estimated 25 percent of homes in Missouri rely on an onsite wastewater treatment system (OWTS) in areas where public sewers are not available. Onsite systems treat wastewater and disperse it on the property where it is generated. When functioning properly, onsite systems prevent human contact with sewage, and prevent contamination of surface and groundwater. Factors that affect the proper functioning of onsite systems include the site and soil conditions, design, installation, operation, and maintenance.

The Missouri Department of Health and Senior Services (DHSS) has set minimum state standards for OWTS. These standards cover new systems and major changes to existing systems. Some examples of major changes are replacing a sewage tank, and replacing or expanding an absorption field. These standards became effective in January 1996.

Public health and the environment are protected when new OWTSs are constructed, and failing systems are repaired or replaced, using criteria equal to or better than Missouri's Minimum Construction Standards. Homeowner understanding of the need for regular maintenance and proper operation of their OWTS is important for long-term system performance and public health protection.

Any individual performing a major modification, repair, or installing a new OWTS must be registered with DHSS. These OWTS professional are provided an ID card which can be requested for verification after completing the required trainings.

A construction permit is generally required before installing or repairing most onsite wastewater treatment systems (OWTS), such as tanks, lateral lines, lagoons, etc. These permits are issued by the Missouri Department of Health and Senior Services.

Provided below are the links to the DHSS website for the lists of

registered installers, soil evalutors, and for more information about DHSS's online application process.

In the State of Missouri no person or property owner may operate an onsite wastewater treatment system (septic tanks, lagoons) in such a manner to cause a nuisance, health hazard, or contamination of surface water and/or groundwater.

To file a complaint contact the Health Center. Note: Anonymous complaints are not accepted.

For complaints regarding city sewers and wastewater treatment plants contact the Missouri Department of Natural Resources by clicking here.

Failing Onsite Wastewater Systems

Failing septic system? You may qualify for financial assistance!

For more information, please visit the H2Ozarks website at

www.h2ozarks.org/moseptic

Homeowner assistance is now available for septic remediation in select watersheds around Harry S. Truman Lake, Lake of the Ozarks, Pomme de Terre Lake, Lake Niangua, and Table Rock Lake. Eligible homeowners can receive up to 100% reimbursement for remediating their septic system!

If you have a failing septic system or one in need of repair, you may qualify for financial assistance if this criteria is met:

Single-family, residential home
Household income less than $61,000
Existing system, new builds do not qualify
Home must be located in a priority watershed
Homeowner must have proof of failing system