What Is A Biomat?

A leach field biomat, is a naturally occurring layer of microorganisms and organic material that forms in the soil surrounding a leach field of an onsite wastewater treatment system. The biomat is an essential part of the treatment process, as it helps to filter and treat the wastewater before it enters the groundwater.

As wastewater flows out of the perforated pipes in the leach field, it comes into contact with the biomat layer in the soil. The microorganisms in the biomat break down and digest the organic matter in the wastewater, removing contaminants and pathogens from the water. The filtered water is then able to percolate through the soil and be further treated before it enters the groundwater.

Why is a biomat good or bad for a septic leach field?

A biomat is a natural part of the treatment process in a leach field of an onsite wastewater treatment system, and it can be both beneficial and harmful to the system, dependent on its thickness and composition.

On one hand, a thin and healthy biomat layer can serve as a natural filter that helps to remove contaminants and pathogens from the wastewater before it enters the surrounding soil. This can help to protect the groundwater and nearby surface water bodies from pollution.

On the other hand, if the biomat becomes too thick or compacted, it can cause problems for the wastewater treatment system. When the biomat is too thick, it can create a barrier that prevents the wastewater from properly infiltrating the soil. This can cause the drain field to become clogged, which can result in slow draining fixtures, gurgling pipes, or even sewage backups into the home or surrounding area.

In general, the presence of a thin and healthy biomat is a sign that the leach field is functioning properly and effectively treating the wastewater. However, if the biomat becomes too thick, it can cause the leach field to fail, and measures may need to be taken to repair or replace the system.

What can be done to prevent an excessive biomat? And keep a health system?

Preventing the formation of an excessive biomat is important for maintaining the health and effectiveness of an onsite wastewater treatment system. This can be achieved through proper maintenance, including regular pumping of the septic tank, avoiding the use of non-degradable materials, and limiting water use to ensure that the system is not overloaded.

1 yr, 10 yrs, 15 yrs, 20 yrs. Accumulation of biomat gone unchecked.