Is California Separating Oil and Water?

"Californians expect their water is not being polluted by oil producers...this poses a very real danger." That's according to the federal EPA, which has found that the state has allowed contaminated waste from oil drilling to be injected into underground water supplies that could be used for drinking or irrigation. The issue is more urgent than ever because three years of drought have reduced the water supply in Kern County, where most oil drilling occurs and where the injection wells are located. David Baker has reported the story extensively for the San Francisco Chronicle.