Which of the following is a common indicator of septic system failure?

Odors near the drain field are a common indicator of septic system failure because they signal that sewage or wastewater is not being processed properly. If the septic system is functioning as intended, the effluent should be treated and absorbed by the surrounding soil without any noticeable odors. The presence of foul smells often indicates issues such as overflowing or backing up of sewage, a clogged drain field, or inadequate treatment of wastewater.

The other options do not typically suggest a failing septic system. Consistent low water charges might reflect a reduced usage of water in the household, which does not directly relate to the performance of the septic system. Increased water pressure is not usually associated with septic system issues; rather, it's related to the plumbing system and could indicate problems elsewhere. Dry soil conditions can indicate insufficient moisture but do not specifically point to septic failure—this could merely be a reflection of weather patterns or local environmental conditions.