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.
State and local officials praise the 2-decade-old program as a national model for coping with the region's water shortages. As California's four-year drought lingers and authorities scramble to conserve every drop, agricultural officials have said that more companies are seeking permits to begin similar programs. The heightened interest in recycling oil field wastewater has raised concern over the adequacy of safety measures in place to prevent contamination from toxic oil production chemicals.
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Until now, government authorities have only required limited testing of recycled irrigation water, checking for naturally occurring toxins such as salts and arsenic, using decades-old monitoring standards. They haven't screened for the range of chemicals used in modern oil production.
No one knows whether nuts, citrus or other crops grown with the recycled oil field water have been contaminated. Farmers may test crops for pests or disease, but they don't check for water-borne chemicals.
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One environmental group has tested the irrigation water for oil field chemicals. Over the last two years, Scott Smith, chief scientist for the advocacy group Water Defense, collected samples of the treated irrigation water that the Cawelo Water District buys from Chevron. Laboratory analysis of those samples found compounds that are toxic to humans, including acetone and methylene chloride — powerful industrial solvents — along with oil.
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Methylene chloride and acetone are used as solvents in many industrial settings. Methylene chloride is classified as a potential carcinogen.
One sample of the recycled Cawelo irrigation water, for example, registered methylene chloride as high as 56 parts per billion. Smith said that was nearly four times the amount of methylene chloride registered when he tested oil-fouled river at the 2013 ExxonMobil tar sands pipeline spill in Mayflower, Ark. That spill was declared a federal disaster, spurred evacuations and resulted in a $2.7-million fine for the company.
Chevron told The Times it does not use acetone or methylene chloride in its oil extraction process. The company would not disclose the fluids used in drilling or well maintenance.
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Microorganisms in soils can consume and process some impurities, Sanden said, but it's not clear whether oil field waste is making its way into the roots or leaves of irrigated plants, and then into the food chain.
It's unlikely that petrochemicals will show up in an almond, for example, he added, "But can they make it into the flesh of an orange or grape? It's possible. A lot of this stuff has not been studied in a field setting or for commercial food uptake."
Carl K. Winter at UC Davis, who studies the detection of pesticides and naturally occurring toxins in foods, said some plants can readily absorb toxins without transferring them to the leaves or the flesh of their fruit.
Still, he said, "it's difficult to say anything for sure because we don't know what chemicals are in the water."
So we don't know exactly what chemicals are being pumped into the ground for fracking (proprietary trade secrets, natch.), but the stuff we find when we bother to properly test the water that is now being recycled for agriculture contains massive amounts of potential carcinogens. And we don't know to what degree the soil could filter out this shit, or to what degree these chemicals could end up in our food-chain, but...profit. So, we'll just assume it's safe and continue shipping the produce grown thus all across America, and all across the world.
So, just in case you thought fracking didn't affect you, because it was happening somewhere else, ask yourself: have you ever eaten agricultural produce from California ?
And of course, expect more of the same, as we continue to try to squeeze the last dregs of fossil-fuels from the earth to sustain our unsustainable economy and lifestyles. What a species we are.
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