Dangerous bacteria linked to multiple infections found in final batches of Contaminated water used to make Tom’s of Maine toothpaste.

The company said it is working with the FDA to remedy issues found in the agency’s May inspection, including an upgrade to its Sanford plant’s water system.

The U.S. Food and Drug Administration issued a warning letter, but not a recall, after microorganisms were found in water samples and finished toothpaste products.