Water Monitorin g When Water Testing Testers look for many things! Turbidity: how many suspended particles are in water (FTU). More Turbid less PS less O 2 in water High or Low Turbidity? Low Turbidity HighTurbidity Salinity How much salt is in water. Ocean = high salinity River = low salinity Changing levels will kill orgs in water. Salt E.Coli Bacteria Used as an indicator species to detect cont. water supplies b/c its found in human/animal feces. Total Coliform Instead of testing for all types of bacteria, usually total coliform is measured 1 colony of bacteria per 100mL is unsafe to drink (EPA) Dissolved Oxygen O 2 in water Healthy water = DO > 8 ppm Oxygen-poor water