What environmental hazard can arise from a failing septic system?

Water contamination is a significant environmental hazard that can result from a failing septic system. When a septic system is not functioning properly, it can allow untreated sewage to seep into the surrounding soil and groundwater. This contamination can lead to the spread of harmful pathogens, bacteria, and nutrients, posing health risks to humans and wildlife. It can also adversely affect local water bodies, leading to issues like algae blooms and the degradation of aquatic ecosystems.

In contrast, improved soil quality, increased plant growth, and the reduction of sewage smell are not outcomes associated with a failing septic system. These outcomes are more likely related to properly functioning systems, where nutrients may enhance soil conditions and support plant life without introducing contaminants.