What is a common issue with septic tanks not vented through building plumbing?

The common issue with septic tanks that are not vented through building plumbing is pressure build-up. Proper ventilation is essential for septic systems because it helps to ensure that the gases produced during the breakdown of waste material can escape from the tank and the building. If a septic tank is not sufficiently vented, gases can accumulate, creating pressure within the tank. This pressure can lead to potential problems such as backups in plumbing, reduced efficiency of the septic system, or even structural damage to the tank over time.

In contrast, the other options present issues that may not be directly related to the lack of ventilation. Increased odors and noise can occur in poorly maintained systems but are not specifically linked to the absence of vents. No water circulation is typically a concern related to water flow or blockages, while limited access for service is more about the physical location and design of the septic system rather than its venting requirements. Therefore, pressure build-up is the primary concern when a septic tank lacks proper venting through the building's plumbing.