"DONNA — The source of the toxic chemicals in the fish of the Donna Canal and reservoir is still a mystery almost 20 years after the U.S. Environmental Protection Agency started looking. But residents of the South Texas town of Donna are still eating the fish laden with PCBs despite a ban and warning signs along the canal."

"The EPA is now overseeing its largest and most comprehensive search in the canal system for PCBs, or polychlorinated biphenyls, cancer-causing chemicals that were used in industrial equipment until they were banned."

Colin McDonald and Lynn Brezosky report for the San Antonio Express-News November 4, 2012. [2]