
08/23/2025
Tomatoes, and most tomato products, require acidifying prior to canning. Studies have shown that harmful bacteria, like Clostridium botulinum, can thrive at pH levels near or above 4.6. Prompting the need for acidification to prevent botulism. Since 1987 the USDA has recommended adding lemon juice or citric acid to all canned tomatoes and tomato products to lower the pH and ensure safety for both water bath and pressure canned tomato products. go.iastate.edu/RYXS03