Turbidity Turbidity, a measure of the light-transmitting properties of water,is another test used to indicate the quality of waste discharges and natural waters with respect to colloidal and residual suspended matter The results of turbidity measurements are reported as nephelometric turbidity units(NTU) It should be noted that the presence of air bubbles in the fluid will cause erroneous turbidity readings. In general there is no relationship between turbidity and the concentration of total suspended solids in untreated wastewaterTurbidity Turbidity, a measure of the light-transmitting properties of water, is another test used to indicate the quality of waste discharges and natural waters with respect to colloidal and residual suspended matter. The results of turbidity measurements are reported as nephelometric turbidity units (NTU). It should be noted that the presence of air bubbles in the fluid will cause erroneous turbidity readings. In general, there is no relationship between turbidity and the concentration of total suspended solids in untreated wastewater