The agency says it requested information from XL Foods by Sept. 8, but the company missed the deadline by two days and the documents it did hand over were unusable.
XL Foods provided officials with better information starting Sept. 11.
A recall of ground beef was eventually issued Sept. 16 and has been expanded to include more than 1,800 beef products across Canada and much of the United States.
Health officials say five people in Alberta got sick from E. coli after eating steaks processed at the plant in Brooks, Alta.
The food inspection agency shut down the plant last Friday and it won't be allowed to reopen until investigators are satisfied.
Also on HuffPost