Which characteristic is MOST associated with a Failing Onsite Wastewater System?

The characteristic most associated with a failing onsite wastewater system is improper discharge of effluent. A failing system typically demonstrates issues such as sewage surfacing on the ground, slow drainage, or unpleasant odors, all indicative of effluent not being processed correctly. This improper discharge suggests that the system is not adequately treating or containing wastewater, leading to environmental contamination and public health risks.

Effective disposal of effluent is what a properly functioning system should achieve, making it not relevant to identifying failure. Routine maintenance and regular inspections are practices designed to prevent failure, ensuring the system operates effectively over time. Therefore, identifying improper discharge of effluent directly aligns with the characteristics indicating that the system is failing.