Command-and-control regulation works particularly well for keeping water resources clean because even a small breach of safety standards can bring a large catastrophic consequence. An example is what happened in Michigan when the state switched Flint’s water supply from Lake Huron

(clean) to the Flint River (polluted). Tap water became discolored and its lead level tripled, prompting residents to bring a class action against the state. But Flint’s problem is rare because command-and-control water regulation is usually effective.