10/4

True or False- High levels of dissolved oxygen indicate or show a healthy water supply.

• True

• False

What is the healthy pH level for potable water?

• 2

• 7

• 14

• 5

If there is a large number of living organisms in and around a water supply, then could the water supply be considered healthy?

• No, because it contains nitrates.

• No, because it contains living organisms.

• Yes, because it contains bioindicators, which are used to assess the health of a water supply.

• Yes, because it contains nitrates, which are used to assess the health of a water supply.

How does temperature relate to dissolved oxygen levels?

• Lower temperatures leads to higher levels of dissolved oxygen.

• Lower temperatures leads to lower levels of dissolved oxygen.

• Higher temperatures leads to higher levels of dissolved oxygen.

• Temperature and dissolved oxygen do not relate.

How is pH level influenced by nitrates?

• If the pH level is too high, then the nitrates become acidic.

• If the pH level is too high, then the nitrates disappear from the water supply.

• If the nitrate levels are too high, then algae grows, which leads to unhealthy pH levels.

• If the nitrate levels are too low, then algae disappears, which leads to unhealthy pH levels.

Which of the following can be concluded based on the data?

• Sites 5 through 8 are most healthy because they have a high % of bioindicators.

• Sites 1 and 13 are most concerning because they have low % of bioindicators.

• Sites 5 through 8 are most concerning because they have a high % of bioindicators.

• Site 12 is most healthy because it has the lowest % of bioindicators.