What I did at Artist Boat was study the salinity( with a refractometer) and see how much light bends when it comes into contact with the surface of the water to see how clear or murky the water is.  How we check water quality is testing the salinity, pH, Turbidity and how clear the water is.   I tested the amount of salt there was in the water to see if it was safe enough to drink and if it was safe for the animals that live in that water as well.   Why we study water quality is to see how safe the water that we live beside and drink and use really is.
Natalia Q.