This article from CNN provides a timeline of the Flint, Michigan, water crisis. After reading the article answer the followign questions.

How do externalities apply to this situation?

Who faces the third-party problem?

Why the Flint River is so polluted in the first place.

Who has the incentive to clean up the river?

How the decision by government officials to change the source of the water supply was driven by cost concerns.

What prevented the government from making a better decision?

Article: https://www.cnn.com/2016/01/11/health/toxic-tap-water-flint-michigan/index.html