Fracking fluid is 99.5% water and sand. 0.5% is made up of safe chemical additives, most of which are found in common household products, like toothpaste and makeup remover, or in the foods you eat. Colorado was the first state to require that producers disclose all chemicals—including their concentrations—to state regulators.
The Colorado Oil and Gas Conservation Commission (COGCC) rules require that “operators publicly disclose the ingredients and concentrations of fracturing chemicals for each well.” In fact, Colorado was the first state to require that producers disclose all chemicals—including their concentrations—to state regulators including the Colorado Oil and Gas Conservation Commission.
Fracing chemicals are similar to other industrial or household chemicals which must be handled properly. For certain chemicals, safe work practices, proper site preparation, and attentive handling are required to ensure that employees, the public, and the environment are protected.
—Colorado Oil and Gas Conservation Commission (Source)
Check out the ingredients using in fracking at FracFocus.org.