Quick Answer
Water bath canning is safe for acidic foods, such as high-acid fruits, pickled vegetables, and relishes, but not for low-acid foods like meats, poultry, and most vegetables, which require pressure canning for safe preservation.
Foods Suitable for Water Bath Canning
Foods with a high acidity, such as citrus fruits and tomatoes, can be safely canned using a water bath canner. This method involves submerging sealed jars in boiling water for a specified period, typically 10-30 minutes, depending on the altitude and the type of food being canned. For example, canning pickles at sea level requires 10 minutes, while at an altitude of 1,000 feet above sea level, canning time increases to 15 minutes.
Pressure Canning for Low-Acid Foods
Low-acid foods, like meats, poultry, and most vegetables, require pressure canning to kill off bacteria and ensure safe preservation. At sea level, these foods should be processed at 10 pounds of pressure for 60-90 minutes, while at an altitude of 1,000 feet, the pressure increases to 15 pounds for 90 minutes. It’s essential to follow tested recipes and processing times to avoid spoilage and foodborne illness.
Altitude and Water Bath Canning
Altitude affects the boiling point of water, and this, in turn, affects the processing time for water bath canning. For every 1,000 feet above sea level, the boiling point decreases by 1.1°F, and the processing time must be adjusted accordingly. For example, at an altitude of 5,000 feet, the boiling point is 204.5°F, requiring a longer processing time to ensure safe canning.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.