Which of the following is typically associated with a large amount of organic material in a water supply a. lower turbidity b. higher phosphates c. fecal coliform d. high dissolved oxygen

The best answer is B) Higher phosphates

As mentioned in the other question regarding water quality, high phosphates help to encourage the growth and reproduction of algae and other similar organisms. This is known as eutrophication. For this reasons, high phosphates are associated with a large amount of organic material in a water supply.