Question 1 (Multiple Choice Worth 2 points)
A home gets its water from the public supply. Which of the following would be the best way for the homeowner to obtain a water-quality report?
Question 11 (Essay Worth 5 points)
<object:standard:la.910.2.2.3>Summarize your findings from the Water Quality Lab. Be sure to include your observations and the sources of each water-quality issue you investigated.
Question 12 (Essay Worth 5 points)
<object:standard:sc.912.n.1.1; ma.912.s.3.2=””>Dan took three samples of water from the creek behind his house once a month for the last six months. He tested the water and reported the results in the following data table.
| Water Quality Indicator | Test Results |
| Dissolved oxygen | Dissolved oxygen levels in the last three months decreased rapidly. |
| Fecal coliform | Fecal coliform ranges from a low of 89 colonies per liter to 102 colonies per liter over the six-month period. |
| Nitrates | Nitrate levels ranged from 6 to 7 mg/L. |
| Phosphates | Phosphate levels were between 0.01 mg/L and 0.3 mg/L. |
| pH | The average pH was 6.9. |
| Turbidity | The water was clear in the first few months, but it became increasingly cloudy over time. |
Which water-quality indicators would be of concern in this situation? Explain your response. Be sure to discuss any implications these water-quality indicators could have on the environment and human health.
