Central Valley's growing concern: Crops raised with oil field water

Here in California's thirsty farm belt, where pumpjacks nod amid neat rows of crops, it's a proposition that seems to make sense: using treated oil field wastewater to irrigate crops.
Oil giant Chevron recycles 21 million gallons of that water each day and sells it to farmers who use it on about 45,000 acres of crops, about 10% of Kern County's farmland.
READ MORE:http://www.latimes.com/local/california/la-me-drought-oil-water-20150503-story.html#page=1