Illnesses started on dates ranging from May 31 to Aug. 8.
Michigan, New Mexico and Washington have also been added to the list of states with reported illnesses
A California-based produce company was the source of fresh onions linked to a deadly E. coli food poisoning outbreak at McDonald's.
The lawsuit was filed one day after the CDC issued a food safety alert warning that dozens of people reported eating the Quarter Pounder sandwich at McDonald's before becoming sick.
If E. Coli levels remain this high, the swimming leg of the triathlon will have to be cancelled, according to World Triathlon competition rules, unless the organization's medical committee decides that the race can go ahead.
A consumer alert has been issued on certain ground beef that could possibly be contaminated with E. coli.