The present invention is a pressure monitoring panel apparatus with a panel housing that contains a programmable logic controller. Pressure transducers transmit the pressures from an aeration basin diffuser head and an aeration basin airline to a programmable logic controller. The programmable logic controller uses the pressures from the aeration basin diffuser head and aeration basin airline to determine the airflow rate through the aeration basin diffuser and the pressure drop across the aeration basin diffuser. Those values are then displayed on a viewable interface.