4. Water pollution. Do one of three

What this is made of

• 4(a). Where your water comes from and goes
• 4(b). A place that floods or suffers drought
• 4(c). The Clean Water Act

Where this step comes from

1. Environmental Science Merit Badge Requirements (Merit Badge Hub, last modified 2026-05-12), Requirement 4 · One of the three, which is what the water pollution question resolves.