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  • Environment
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California Regulators Examine Safety Of Food Irrigated With Oil Wastewater

  •  Amy Quinton 
Thursday, October 27, 2016 | Sacramento, CA
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Amy Quinton / Capital Public Radio

Oil well in Kern County, CA.

Amy Quinton / Capital Public Radio

For more than 30 years, wastewater from oil and gas operations has been used to irrigate food crops in California. Regulators will re-examine the safety of that practice during a public hearing Friday. 

Four oil companies in the state currently send oil field wastewater to four irrigations districts. Once treated, it’s then recycled and used on food crops, primarily in Kern County.

To date, no studies have shown that irrigating crops with oil wastewater poses any threat, says Clay Rodgers, with the Central Valley Regional Water Quality Control Board.

"If evidence comes available to the regional board that indicates that there are issues associated with the use of this water, then certainly we will take quick measures to address those concerns and mitigate any impacts,” says Rodgers.

Environmental advocates say oil field wastewater could contain toxic chemicals that can cause cancer or reproductive harm.

Dr. William Stringfellow with Lawrence Berkeley National Laboratory has conducted an independent study on chemicals used in oil production.

“There’s nothing particularly at this moment that’s a smoking gun type of information that suggests that anything unsafe is occurring," says Stringfellow. "But there’s enough questions coming up that it’s worthy of further investigation.”

The study did not look at chemicals in treated water that end up on food crops, but instead looked at chemicals used in oil production. He says it’s difficult to estimate risks to consumers when oil companies don’t disclose chemicals they consider trade secrets. Oil companies also don't disclose the amounts of chemicals used in extracting oil.

The water board says it will consider banning the practice if it’s deemed a public health threat.  


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 agriculturewaterfoodWater Supplyoil drillingwater recyclingoil productionCalifornia wateroil wastewater

Amy Quinton

Former Environment Reporter

Amy came to Sacramento from New Hampshire Public Radio (NHPR) where she was Environment Reporter. Amy has also reported for NPR member stations WFAE in Charlotte, WAMU in Washington D.C. and American Public Media's "Marketplace."  Read Full Bio 

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