Manufacturer Ready Pac Foods, Inc. is recalling the spinach, which was produced and distributed in California, Oregon and Arizona between June 21 and 27.
E. coli was found in routine surveillance samples, but no illnesses have been linked to the product, the health department said.
The spinach is sold in 6-ounce packages, and recalled lots are best if used by July 4 and July 8, respectively. The lot numbers are I1707B IR127121 and I2007B IR130373.
E. coli causes abdominal cramps and diarrhea. Severe infections can lead to kidney damage, and complications can be fatal. Young children, the elderly and those with compromised immune systems are most at risk.