In the movie gasland what was contained in the jar that josh collected in dimock?

In the movie "Gasland," Josh Fox collects a jar of water from Dimock, Pennsylvania, which contains a significant amount of methane gas. When he holds a lighter to the water, it ignites, demonstrating the dangerous levels of flammable substances in the drinking water. This scene highlights the environmental and health risks associated with hydraulic fracturing (fracking) in the area.