For a Wisconsin mound system, how many feet of suitable soil must be beneath the aggregate?

In a Wisconsin mound system, there must be a minimum of 2 feet of suitable soil beneath the aggregate. This requirement is critical because the suitable soil layer plays an essential role in filtering and treating the effluent from the septic system. It ensures that the wastewater is adequately treated as it percolates through the soil before it reaches the groundwater, thereby preventing contamination.

The 2 feet of suitable soil helps provide enough space for natural biological processes to take place, as beneficial microorganisms in the soil break down pollutants in the effluent. Moreover, this depth is important for maintaining proper drainage and preventing surface runoff, which could lead to system failure and environmental issues.

Having less than 2 feet may not provide sufficient treatment or drainage, increasing the risk of system malfunction and pollution, which is why this specific regulation is put in place.