Does fracking cause tap water to catch on fire?

No. This rumor started with the anti-fracking film Gasland, which showed a man in Colorado lighting his faucet on fire and blaming fracking. Before the film was released, however, Colorado regulators had investigated the case and determined it had nothing to do with oil and natural gas development. In many places, people have been able to light their tap water on fire long before fracking was around, due to naturally occurring methane pockets.