It’s been done for two decades but after the release of a new report, controversy is building. Should farmers irrigate crops with waste water from oil extraction? Even with recent rains, the demand for water sources is high. About 80 percent of the water used by Californians goes to agriculture. Stephen Stock investigates as scientists call for a halt to the practice until more is known about the chemicals in that water. Senior Investigative Reporter Stephen Stock reports in a video that first aired on Feb. 17, 2017.