What is a common sign of a failing septic system?

A strong odor in the yard is a common sign of a failing septic system because it often indicates that untreated sewage or wastewater is leaking from the system. This odor results from the breakdown of organic matter and the gases produced by bacteria in the sewage. If the septic tank is not functioning properly, it can lead to sewage backing up into the system, causing the odors to escape into the yard or surrounding area.

In addition, the presence of strong smells can suggest that there is a problem with the tank itself, such as a blockage or overflow, which requires immediate attention to prevent environmental contamination and health hazards. This is a key indicator that residents should take seriously, as it suggests the system is unable to properly treat or contain the waste it collects.

The other options do not typically suggest a failing system; for instance, healthy lawn growth can sometimes occur over a properly functioning drain field, while quickly disappearing toilets or the absence of water pooling do not necessarily indicate failure without other accompanying signs.