Blue Bell Creameries Knew About Listeria Contamination in 2013: FDA Report

— -- Blue Bell Creameries knew its ice cream plant surfaces tested positive for listeria as far back as 2013, according to a new Food and Drug Administration report released today.

The ice cream company was forced to recall all products and hit the restart button on its operations this year after it was linked to a listeria outbreak that sent 10 people to the hospital and killed three of them, according to the Centers for Disease Control and Prevention.

According to the FDA inspection report from its investigation following the listeria outbreak, surfaces at Blue Bell's plant in Broken Arrow, Oklahoma, tested positive for listeria five times in 2013, 10 times in 2014 and once in January 2015. The surfaces included the floor in front of a freezer, the drain behind a flavor tank and, the report notes, something at a "half gallon filler" tested positive, but the identifying information of this item was redacted in the report.

"Specifically you failed to demonstrate your cleaning and sanitizing program is effective in controlling recurring microbiological contaminations," the FDA report says.

Blue Bell said it was using tests for listeria and other microbials to determine whether cleaning and sanitation was effective, the report says, but despite the positive listeria tests, the ice cream company didn't make any adjustments.

Food safety attorney Bill Marler said the inspection reports released today are among the worst he's seen in his 20-year career.

"How Blue Bell could run a plant with years of positive listeria test results is shameful," he said.

Marler said he is representing two listeria-positive Blue Bell victims.

Blue Bell spokesman Joe Robertson gave the following statement to ABC News:

"Several swab tests did show the presence of listeria on non-food surfaces in Blue Bell's Broken Arrow plant in 2013. As is standard procedure for any such positive results, the company would immediately clean the surfaces and swab until the tests were negative. We thought our cleaning process took care of any problems, but in hindsight, it was not adequate, which is why we are currently conducting such a comprehensive re-evaluation of all our operations."

ABC News' Gitika Kaul contributed to this report.