This is an activity about turbidity, or the amount of sediment suspended in water. Learners will discover how this important characteristic affects aquatic life as they observe different water qualities. Supplies are simple and can be found around the house. Included are suggestions for taking the activity further and into nature. This activity could also be used in an environmental science curriculum by asking the question, do humans have impact on the turbidity of lakes and streams? If the answer is yes, how so?