The links below offer some information about permits for onsite wastewater treatment system (OWTS) in Missouri. Numbers of permitted system repairs, replacement systems, and new systems and the types of systems are provided by county where available. Brief descriptions of types of OWTS can be found if you return to our OWTS page.

At this time, 2006 - 2012 OWTS permit information is available for most counties. Data was gathered through the Local Public Health Agency Infrastructure Survey by the Center for Local Public Health Services and the Onsite Wastewater Treatment Program, from other local onsite permitting authorities, and from Onsite Wastewater Treatment Program permit records. Note that an exemption allows unpermitted OWTS installation on certain acreages (typically over three acres) in some counties; so that systems may have been installed on larger acreages even though zero (0) OWTS permits are reported for a county. Also, the numbers of different types of systems or components shown for a county may differ from the total number of permits. Some examples are: there are many different possible combinations of system components, a system repair may only require a permit for a part of the system, and local records might not help answer the survey questions very well.

You can access yearly summaries of the available permit information through the links below.

Additional information about onsite systems and other decentralized wastewater treatment systems is offered on the US Environmental Protection Agency (EPA) website: