Driving around the rural back roads of Garfield County, Colo., you don’t see many cars. But one type of vehicle keeps popping up, often the only one you’ll see for hours: the white pickup trucks favored by gas drilling companies. Here in the central western part of the state, the rolling fields of scrubby yellow-green vegetation are frequently punctuated by natural gas wells. Even after a well has stopped producing gas, big cylindrical tanks of waste water and natural gas condensate remain, sitting behind low fences by the roadside. Too often those tanks emit toxic substances into the air or leak their contents into the ground, including volatile organic compounds (VOCs) such as benzene and toluene.
People who live on or near properties with gas wells say they have experienced an array of health effects from exposure to high concentrations of these chemicals. The known immediate effects of exposure to high concentrations of benzene, according to the Centers for Disease Control, include headache and drowsiness. Long-term exposure can cause cancer, as well as fertility problems in women.