FracFocus is the national hydraulic fracturing chemical registry, managed by the Ground Water Protection Council and Interstate Oil and Gas Compact Commission. This site allows you to find a well by location, name, company and additive.

The FracTracker Alliance is a non-profit organization dedicated to enhancing the public’s understanding of the impacts of the global shale gas industry by collecting, interpreting, and sharing data and visualizations through this website.

Produced by the U.S. Geological Survey, contains geochemical and other information for produced waters and other deep formation waters of the United States.

From Geology.com, this page contains information about the composition of hydraulic fracturing fluids.

Data from the Pennsylvania Dept. of Environmental Protection, the original article had reported data incorrectly from the DEP and was corrected later.