Biomat is a layer of organic matter that builds up at the soil-effluent interface in the drain field. It reduces drainage and is usually caused by over-loading the system or poor maintenance. You don’t necessarily need to replace the drain field – sometimes rest (pumping down the system and reducing usage) allows it to recover. Get a specialist’s assessment. Recovery is often possible without full replacement (which would cost $5-10k).
Biomat is a layer of organic matter that builds up at the soil-effluent interface in the drain field. It reduces drainage and is usually caused by over-loading the system or poor maintenance. You don’t necessarily need to replace the drain field – sometimes rest (pumping down the system and reducing usage) allows it to recover. Get a specialist’s assessment. Recovery is often possible without full replacement (which would cost $5-10k).