Question

What happened to change the water quality in Flint?
1. The city built a new pipeline to connect to a nearby water system.
2. The city switched its water source from the Flint River to the Detroit water system.
3. The city added chlorine to the water supply, which removed harmful bacteria.
4. The city switched its water sources from the Detroit water system to the Flint River.

Answer 1

4. The city switched its water sources from the Detroit water system to the Flint River.