Residential Onsite Wastewater Treatment

Consider a mound for effluent treatment when the lot has slowly permeable soils, sandy or gravelly soils, or a high water table. Currently, a professional engineer must design the septic tank/mound system, and a construction permit from NDEQ is required. NDEQ is working toward implementing an endorsement for mounds in the regulations. In the future, after paying the appropriate fees and passing an endorsement exam, a certified professional with a mound endorsement would be allowed to design a mound system. The mound system includes a septic tank, pumping chamber and mound, all of which must be sized according to potential wastewater generation from the home. A properly designed, installed and maintained septic tank/mound system will protect human health and the environment.