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Fracking wastewater may be more radioactive than assumed. A study published in April 2015 in Journal Environmental Health Perspectives shows that current assessments of the radioactivity wastes from [[hydraulic fracturing]] focus on radium rather than a comprehensive analysis of multiple radioactive elements. The use of radium alone to predict radioactivity concentrations can greatly underestimate total levels.<ref>[http://ehp.niehs.nih.gov/1408855/#tab2 "Understanding the Radioactive Ingrowth and Decay of Naturally Occurring Radioactive Materials in the Environment: An Analysis of Produced Fluids from the Marcellus Shale"] Environ Health Perspect, July 2015.</ref>
Dr. Marvin Resnikoff in a report for Delaware River Keeper wrote that the state's Department of Protection (DEP) failed to act on evidence of radium leaking from landfills where oil and gas waste is dumped.
===Radon===
