What are potential environmental impacts of a failing septic system?

The correct answer highlights the serious consequences associated with a failing septic system. When a septic system malfunctions, it can lead to the release of untreated sewage and wastewater into the environment. This contamination can negatively impact groundwater and surface water sources, posing a significant risk to aquatic ecosystems and drinking water supplies. The presence of pathogens, nutrients, and other pollutants in the water can lead to various health hazards for humans and wildlife, including waterborne diseases and algal blooms.

Considering the other options provides valuable context. The suggestion that a failing septic system could enhance groundwater quality and soil fertility is misleading; instead, the opposite occurs, with pollution and harmful substances compromising these resources. The idea that there would be no significant impacts if the system were monitored regularly fails to take into account the inherent risks associated with system failures, which can occur unpredictably and lead to immediate environmental degradation. Lastly, the notion that a failing septic system could lead to improved water filtration in surrounding areas is inaccurate, as it overlooks the fact that the pollution from the system typically overwhelms any potential natural filtration benefits, resulting in further environmental damage.