The group says that back in April of this year, another advocacy group obtained internal U.S. Food and Drug Administration emails that shows the agency had been "testing food for glyphosate for two years and has found 'a fair amount, ' but the FDA has not released its findings".
"There are levels above what we could consider safe in very popular breakfast foods", said Alexis Temkin, Environmental Working Group's toxicologist who helped with the analysis in the report.
Other brands that tested positive for glyphosate included Kellog's Oat Bran, as well as granola and granola bars with oats. In 2017, California listed glyphosate in its Proposition 65 registry of chemicals known to cause cancer.
Monsanto has denied a link between the active ingredient in Roundup - glyphosate - and cancer, saying hundreds of studies have established that glyphosate is safe.
But just last week, a jury in California ordered Monsanto to pay one man $289 million in damages after he claimed the company's weed killers caused his cancer.
"We will petition the Environmental Protection Agency to do its job and end uses of glyphosate that resulted in the contamination we report today", EWG president Ken Cook said.
Glyphosate rich Roundup is the most popular and widely used pesticide in the U.S.
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Both Quaker Oats and General Mills, which makes Cheerios, said that their products were safe and met federal standards. One of the products that was found with the highest level of glyphosate is the Old Fashioned Quaker Oats at more than 1,000 parts per billion. The U.S. Environmental Protection Agency, for instance, has found that children between the ages of one and two have much higher exposure than older people.
Dr. Jennifer Lowry, Chairperson of the American Academy of Pediatrics Council on Environmental Health tells KTVU it is not uncommon to find pesticides in our food.
"Glyphosate does not belong in cereal".
"We proudly stand by the safety and quality of our Quaker products". Quaker Dinosaur Eggs, Brown Sugar, Instant Oatmeal contained as much as 780 parts per billion in one sample. Farmers will spray the weed-killing chemical on crops, such as wheat, oats and lentils, before harvest.
EWG-which has received criticism for being too alarmist about toxic chemicals-thinks that even California's proposed limit is too high.
In light of the lawsuit and the World Health Organization's 2015 conclusion that the chemical is a "probable carcinogen", said EWG on Wednesday, "It is very troubling that cereals children like to eat contain glyphosate".
In a statement to FOX Business, a Home Depot spokesperson said the company follows all regulatory guidelines regarding the sale of Roundup, and that they plan to continue to sell these products going forward. Kellogg, for example, said its food is safe and that the ingredients it buys from suppliers fall under the EPA's "strict standards for safe levels of these agricultural residues".
"This data was evaluated by Health Canada and no human health concerns were identified", the agency said in its report.