There are six YSI Endeco continuous monitoring stations with water quality measurement instruments deployed within the Bay and the Rivers Taff and Ely (see map). These stations are solar powered which together with storage batteries allows continuous operation and measurement of dissolved oxygen, temperature, pH, conductivity and turbidity.

The  collected data is telemetered via radio or GSM cellphone to a computer in the Harbour Authority office. The data is analysed daily by Harbour Authority staff and is also subject to scrutiny by the Environment Agency which has on-line access to the computer. Water quality measurements are made at 1 metre depth at all buoys and at 1 metre above the bed of the bay at three of the buoys. The Water Quality Team ensure the continual operation, calibration and maintenance of these monitoring stations.