For homeowners, NoMound’s® features are easily understood – NO MOUND !!!


In layman’s terminology, the reason for elevated sand mounds has to do with the requirement for a specific “separation distance” between the bottom of the wastewater system drainfield and the water table (the groundwater level beneath the ground surface). This thickness of unsaturated soil is a vital and necessary part of a properly designed and operating onsite wastewater system. Different states have different requirements – varying between 6-inches in South Carolina to 5-feet or more in some Massachusetts communities. So, where the water table is close to the ground surface, the separation distance can be achieved by placing the drainfield above the original ground surface in an elevated sand mound.

In a NoMound® system, the separation distance is achieved by lowering the water table beneath the drainfield. The technical approach to creating and maintaining the required separation distance is described in the section below.

NoMound® deals with the shallow water table “problem”. The rest of the onsite wastewater system equipment is conventional and conforms to the code requirements and installation practices of the local community. The septic tank or other pretreatment is conventional. The pump tank and drainfield are identical to those used for a pressure-dosed mound. The homeowner will notice no difference – except – NO MOUND !!!

Engineers and Installers Understand the NoMound® Advantage

For consulting engineers, site managers, installation contractors and regulatory officials, NoMound's® features are clearly understood. Derived from tough industrial site-remediation applications, NoMound® has been adapted to control high groundwater for onsite wastewater treatment systems. It basically creates a zone of unsaturated soils so that a conventional drainfield will function properly in a high groundwater setting. The effluent distribution lines are housed within a buried enclosure constructed of geomembrane and/or natural claylike materials around the perimeter and above the drainfield area. As air is introduced into the enclosure at a slight positive pressure (often less than 2 psig), the high water table is lowered and the desired thickness of unsaturated soils is created and maintained. Wastewater effluent from the septic tank or ATU is pumped to the drainfield, and the conventional absorption bed's physical and biological processes are maintained. Surpassing unsightly, high-cost sand mound systems, NoMound® offers the homebuilder/developer and homeowner today's state-of-the-art solution for wastewater management for high groundwater residential sites.