What measurement criterion is referenced in conjunction with the septic tank's liquid level?

The reference to WAC 246-272A-0232 aligns with the measurement criterion that pertains to septic tank liquid levels. This particular regulation describes the design and maintenance standards critical for on-site sewage systems, addressing the required liquid level within septic tanks to ensure proper function and wastewater management.

Understanding the significance of this regulation is key for septic installers, as it sets forth guidelines that are essential for the design, installation, and operation of septic systems. Maintaining the correct liquid level is crucial for allowing adequate settling of solids and ensuring that effluent can be effectively treated before it is released into the environment. Adhering to established regulations like WAC 246-272A-0232 ensures compliance with state mandates and supports public health and environmental safety.

In contrast, the other references pertain to different aspects of septic system management or regulations, which do not align specifically with the liquid level measurement.