Which condition can indicate venting issues in drainage systems?

Water pooling around fixtures is a clear indication of venting issues in drainage systems. When a drainage system is properly vented, air can enter the drainage pipes to equalize pressure and facilitate the smooth flow of wastewater. If a venting issue occurs, air pressure can become unbalanced, leading to a situation where wastewater cannot flow freely. As a result, you may observe water pooling around fixtures, as the drainage system is unable to adequately carry away the waste due to the inadequate venting. This pooling can create stagnant water, which may lead to further problems, such as slow draining or even backups.

The other conditions listed do not suggest venting issues. Increased efficiency in water flow and quick drainage of all water indicate a well-functioning system, while the absence of odor in the plumbing system is typically a sign that the traps are functioning correctly and preventing sewer gases from entering the living space, which is unrelated to venting problems.