What can be a consequence of poor absorption rates in a mound system?

Poor absorption rates in a mound system can lead to a backup of wastewater. When a mound system is functioning properly, it relies on the soil's ability to absorb and treat wastewater efficiently. If the absorption rates are inadequate due to factors such as soil compaction, saturation, or insufficient space, the system cannot adequately process the effluent. This can result in wastewater accumulating within the system, leading to potential backups. Such backups can manifest as sewage surfacing in the yard or backing up into the home, which poses health risks and creates unpleasant living conditions.

The other options do not correlate with the consequences of poor absorption rates. A longer system lifespan and reduced maintenance requirements are typically associated with effective systems, while improved plant growth might occur in well-functioning systems, but not in ones with poor absorption capabilities. Therefore, the main issue stemming from poor absorption rates is indeed the increased risk of wastewater backup.