Oil and gas do not travel easily through ... For instance they state that "Injection of hydraulic fracturing fluids directly into groundwater resources" can cause contamination.

After crews were able to contain the leak, now environmental groups are working to learn if there was any damage done.

The use of hydraulic fracturing to extract oil and gas from the earth dates ... Fracking-the high-pressure injection of water, chemicals and sand into shale deposits to release the gas and oil ...