Did you know that some of the fruits and veggies out on supermarket shelves are grown using wastewater from oil and gas operations? For the past several years, many drought-stricken farms in California’s Central Valley, which produces 40 percent of the nation’s fruits and vegetables, have been increasingly irrigating their crops with wastewater — a practice the US Department of Agriculture does not restrict.
Now a new report by the Environmental Working Group says that this wastewater is possibly tainted with toxic chemicals, including chemicals that can cause cancer and reproductive harm. Farmers in Kern County have irrigated some 95,000 acres of food crops with billions of gallons of oil field wastewater, according to the report, which is based on an analysis of state data.
Actually, oil companies have been quietly selling wastewater for irrigation in California for decades, but it’s only in recent years that the matter has become public knowledge. In the past, the state required regular testing for only a handful of pollutants to satisfy permit requirements for use of wastewater on agriculture. This is the first time we are getting a detailed look at the makeup of the toxic cocktail that could be lurking in the water.
According to state data, oil companies operating in California have reported that recycled wastewater sold to Kern County irrigation districts since 2014 contained more than 20 million pounds and 2 million gallons of dozens of toxic chemicals. These chemicals included 16 that the state classifies as carcinogens or reproductive toxicants. Levels of the chemicals were not measured and a full assessment of what exactly is in this water is pretty much impossible because the companies have withheld the identity of almost 40 percent of the chemicals as so-called trade secrets.
Currently, the lightly treated wastewater is blended with fresh water and then applied to almonds, pistachios, and citrus trees, as well as to grapes, carrots, beans, tomatoes, and potatoes grown in the Cawelo, North Kern, Jasmin, and Kern-Tulare Water Districts in Kern and Tulare Counties. According to an earlier EWG report, in some of these places the water can even be used as drinking water for livestock and for farmed fish.
Although crops grown with this recycled water represent a small percentage of the food grown in the Central Valley, once the produce is at the grocery store, there’s no way of telling it apart from other fruits and vegetables.
The Central Valley Regional Water Quality Control Board has appointed an expert food safety panel to study the possible impact of using wastewater to grow food. Its findings are expected next year.
Despite the new information about the mix of toxic chemicals present in oilfield wastewater, the California water board has refused to halt the practice, and, according to EWG, it is even allowing the expansion of the irrigation method.
But EGW researchers say that while there’s cause for concern, it doesn’t mean that we should stop eating produce from California.
“Although it is well-established that pollutants in water and soil can build up in crops — especially root crops such as carrots and potatoes, which are grown in Kern County with oil field wastewater — scientists don’t know if that poses a health risk for people who eat the food,” says the report, written by EWG senior scientist Tasha Stoiber. “A healthy diet high in fruits and vegetables outweighs uncertainties about chemicals in produce.”
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