Flammable tap water.  You’ve seen it on Gasland.  You can find several YouTube videos of this event on the net.  Now the research has caught up with the reality.  Duke University studied water quality in the vicinity of hydraulic fracturing and produced incontrovertible evidence that fracking contaminates drinking water wells with methane gas. The study published Monday found potentially dangerous concentrations of methane gas in water from wells near drilling sites in northeastern Pennsylvania, although not in central New York, where gas drilling is less extensive. But in an unexpected finding, the team of Duke University scientists did not find any trace of the chemicals used in the hydraulic fracturing process in 68 wells tested in Pennsylvania and Otsego County in central New York. In hydraulic fracturing, or fracking, water, sand and chemicals are injected underground to crack the rock and get natural gas to flow into a well. Critics of the technique have worried more about the chemicals since companies have refused to make public the proprietary blends used, and many of the ingredients can be toxic.

On average, water from wells located less than a mile from drilling sites had 17 times more methane than water tested from wells farther away, according to the study published Monday in the Proceedings of the National Academy of Sciences.  Methane is not known to be toxic, but in high concentrations it can be explosive and cause unconsciousness and even death, since it displaces oxygen needed to breathe. Of the 60 wells tested for methane gas, 14 had levels of methane within or above a hazard range set by the Department of Interior for gas seeping from coal mines — all but one of them near a gas well. In nine wells, concentrations were so high that the government would recommend immediate action to reduce the methane level. Methane is released naturally by bacteria as they break down organic matter. The researchers’ analysis shows that the type of methane in the wells with the highest concentrations is coming from deep in the earth, the same place tapped by companies in search of natural gas.

In the most severe case, a homeowner in Bradford County, Pa. who leased her property to a gas company has so much methane coming out of her tap she can light her water on fire. A natural gas well is located 800 feet from her house.