U.S. Department of Agriculture inspectors found salmonella in a routine test taken in New York last month. No illnesses have been reported.
Officials notified the shipper, Salinas-based Steinbeck Country Produce. The company issued a voluntary recall Aug. 28 for 3,360 cartons.
Steinbeck's produce was distributed in California, Massachusetts, Texas, Indiana, New York, Michigan, Missouri, Kansas and Arizona.
Castroville-based shipper Ocean Mist Farms recalled 1,746 cases as well, after realizing they came from the same lot. Ocean Mist wouldn't say where it's onions were distributed.