Two recent studies by the U.S. Geological Survey, Duke University, and the University of Missouri have demonstrated that fracking wastewater injection disposal sites can lead to contamination of surface waters in nearby streams.  Of particular concern, the studies found endocrine-disrupting activity in the streams at levels high enough to lead to adverse health effects in aquatic life. Where potential or actual public underground drinking water sources are affected, citizens suits under the Safe Drinking Water Act may provide a way for people to defend their environment from contamination by wastewater injection.