What effect can mulch on a drain field have on a septic system?

Mulch on a drain field can indeed impede evaporation and absorption, which are crucial functions of the septic system. Drain fields rely on the natural process of evaporation and the absorption of liquid waste into the surrounding soil. When mulch is applied excessively or improperly, it can create a barrier that prevents proper airflow and moisture exchange. This can lead to saturated soil conditions, which might inhibit the effective processing and dispersal of effluent. The accumulation of water on the surface can also promote unhealthy conditions that can affect the overall efficiency of the septic system and potentially lead to system failures or backup issues.

While mulch does have aesthetic benefits and can play a role in filtering contaminants, these aspects are secondary to its primary function concerning the health and proper functioning of the drain field. Additionally, while mulch can improve nutrient absorption in some contexts, in the specific case of a septic drain field, the obstruction to evaporation and absorption takes precedence.