Most septic systems fail because the soil in the drain field becomes clogged with a layer called biomat.
Biomat is a natural layer of bacteria, organic waste, and microbial byproducts that forms where wastewater enters the soil. Over time it can thicken and restrict the soil’s ability to absorb water.
About 40 to 60 percent of septic failures are caused by drain field clogging, followed by poor maintenance and failing components, hydraulic overloading, and poor system design.
