If your system will be installed on less than three acres, or if you will have more than one system on 10 acres, call the environmental office to discuss your situation. Obtain an Application to Construct an On-site Wastewater Treatment System from our office. Pay $90.00 to the Missouri Department of Health and Senior Services. Have a soil morphology conducted by a Missouri registered soil scientist. Have an on-site wastewater treatment system or holding tank designed by a Missouri registered installer or engineer (depending on your soil morphology). Submit your Application to Construct an OWTS, soil morphology and OWTS design plan to our office for review. Staff from our office will schedule an on-site visit with you or your installer once the system is flagged out according to the approved design. Construction of the OWTS may begin once a permit is issued by this office.