Gelling agents, acids, friction reducers, surfactants and many other chemicals are pumped into the ground to break up rock formations and release natural gas. Many of these chemicals are known carcinogens and volatile organic compounds. After returning to the surface, the “produced” water is placed in evaporation ponds and dispersed into the air. Fracking fluid is exempt from the Safe Drinking Water Act and drilling companies are not required to disclose all the chemicals they use.