the fracking fluids got into her well. >> reporter: in 2004, encana drilled a well on their property,nd the bells say their lives changed forever. after three spills and what they say was constant exposure to fumes, the bells sold out and moved away. but they say they still suffer from coughs, headaches and even memory loss. >> you know, you can look at those things and it gets you to wondering. was breathing five, six, eight, ten, 20 shots of gas fumes a day while you're out working on your property messing with your brain? or is it messing with your body? you just don't know. >> reporter: in fact, dozens of garfield county residents have complained of headaches, nausea and nosebleeds they believe were caused by gas wells. but any scientific link between fracking and health effects has been difficult to prove. the environmental protection agency has just begun a two-year investigation into the safety of fracking. in the meantime, some members of congress are taking action of their own. denver congresswoman diana degette recently released a congressional report which showed gas compan