Salmonella thrives and grows in moist environments but can survive for extended periods of time in and on dry foods and surfaces.
Food safety basics
We provide food entrepreneurs, commercial food vendors, fruit and vegetable farmers, and Minnesotans preserving and preparing foods at home the resources they need to produce, preserve and distribute their foods safely. This includes:
- Food safety training for cottage food producers.
- Safe food sampling at farmers markets and community events.
- On-demand and in-person certified food manager renewal courses.
- FSMA produce safety rule grower training.
- Good Agricultural Practices workshops for small to midsize fruit and vegetable farms.
Common foodborne illnesses
Listeria
Listeria monocytogenes is a foodborne illness-causing microorganism that is found naturally in the environment, including soil and water.
Clostridium botulinum
Clostridium botulinum is commonly found in soil and when conditions are favorable, it produces a very deadly toxin.
A to Z: Kitchen tools for safe food preparation
Food safety includes knowing how to use and maintain your kitchen tools.
Cutting boards can hide harmful germs, especially when they’re scratched, grooved or not properly cleaned. Whether your board is plastic, wood or glass, use and maintenance make a big difference in food safety.
Choosing the right cutting board
- Choose a cutting board with a smooth, hard surface that’s approved for food contact.
- Avoid using cutting boards with deep grooves or scratches, as these can trap harmful germs.
- Replace the cutting board when it becomes heavily worn with deep grooves or scratches.
Preventing cross-contamination
- Do not prepare ready-to-eat foods (i.e., fruits or vegetables) on a cutting board used for meat without cleaning and sanitizing it first.
- If possible, use separate boards for different types of foods. For example, use one cutting board for raw meat, poultry, or seafood, and another for fruits, vegetables, and ready-to-eat foods.
- Use color-coded boards to prevent cross-contamination.
- Red: raw meat, poultry and seafood.
- White: fully cooked meat, poultry and seafood.
- Green: fruits, vegetables and other ready-to-eat foods.
Cleaning and sanitizing
To clean
- Scrap off stuck-on food.
- Wash with hot, soapy water and scrub thoroughly or use a dishwasher if the board is dishwasher-safe.
- Caution: Thin plastic boards or wood may warp.
To sanitize
- Mix one teaspoon of household unscented bleach with four cups of water.
- Submerge the board in the sanitizer solution. Follow the sanitizer label directions for soak time.
- Do not rinse.
- Allow to air dry before use.
Storage tips
- Let your cutting boards dry completely before you put them away.
- Store in a clean, dry location that is away from raw meats and juices.
Pressure canners with a dial gauge should be checked for accuracy each year before use. This is an important step in safely preserving foods and should not be skipped.
Pressure canners will either have a dial gauge or a weighted gauge for indicating and regulating the pressure inside the device.
A dial gauge can lose accuracy over time and with repeated use. If a dial gauge reads high, this can lead to under-processing or not reaching the required temperature during canning. Under-processing can result in unsafe food. If a dial gauge reads low, this can lead to over-processing or too high of a temperature reached during canning. Over-processing can result in poor-quality food.
Weighted gauges will rock gently or make a frequent jiggling noise to indicate if the correct pressure is being maintained. Read the manufacturer's instructions to know how a particular weighted gauge should rock or jiggle. Weighted gauges do not require testing for accuracy as the weights are solid pieces of metal with no movable parts.
Dial gauge accuracy
Dial gauges that read 2 or more pounds differently, either high or low, during testing should be replaced. Pressure adjustments can safely be made if the dial gauge reads up to 2 pounds high or low.
All American pressure canners are manufactured by the Wisconsin Aluminum Foundry. These pressure canners have both a weighted gauge and a dial gauge. These models are regulated by the weighted gauge. The dial gauge is for reference purposes and does not require testing. Contact the Wisconsin Aluminum Foundry for testing and replacement part questions at 920-686-2701 or [email protected].
For all other pressure canner brands, please check with the manufacturer for testing services and replacement parts.
How to have your dial gauge checked
National Presto Industries will test dial gauges at no charge from these brands:
- National (made by National Presto Pressure Cooker Company)
- Magic Seal (sold at Montgomery Ward)
- Maid of Honor (sold at Sears, Roebuck and Company)
- Presto
Steps to send in your pressure gauge
- Complete the Presto testing request form(printable version)
- Carefully remove the dial gauge from the canner lid. If you cannot remove the dial gauge from the lid, you can send the lid with the dial gauge attached. Do not include the base of the pressure canner.
- Package the dial gauge with foam, bubble wrap, or other packaging supplies to prevent damage during shipping.
- Presto recommends using a tracking number when shipping your dial gauge.
- Ship to: National Presto Industries, Inc.: ATTN: Gauge Testing, 3925 N Hastings Way, Eau Claire, WI 54703
After the dial gauge has been tested, Presto will return your dial gauge to you with the results and recommendations for use.
A slow cooker or "crock pot" is a convenient, portable electric appliance popular in today's kitchens. They are economical to operate and a great way to tenderize less expensive and tougher cuts of meat (shoulder, round, and chuck).
Is a slow cooker a safe way to cook food?
Yes, when used correctly. Slow cookers cook food at a low temperature, generally between 170 and 280°F, over several hours. The combination of direct heat from the pot, extended cooking time, and steam destroys bacteria, making it a safe method for cooking food. However, a slow cooker should be used correctly to ensure food safety and quality.
Slow cooker food safety tips
- Don’t cook on the “warm” setting.
- This setting is intended to keep already cooked food warm before serving.
- Using it to cook food can leave food in the temperature danger zone (40°F–140°F), increasing the risk of foodborne illness.
- Keep the lid on during cooking
- Each time you lift the lid, the internal temperature drops 10 to 15 degrees and the cooking process is slowed by 30 minutes.
- Always use a food thermometer to check internal temperatures
- Poultry: 165°F
- Roasts: 145 to 160°F
- Soups, stews and sauces: 165°F
- Preheat when possible
- Preheat your slow cooker or cook on high for the first hour to get foods out of the temperature danger zone (40-140°F).
- Adding hot liquids can help the cooker reach a safe temperature quickly.
- Add enough liquid
- Liquids transfer heat to foods, playing an important role in the cooking process.
- Fill the slow cooker ½ to ¾ full with food and liquid, following manufacturers directions for best results.
- When cooking meats or poultry, the liquid should cover the ingredients to ensure even heat distribution.
Cooking specific foods
- Cooking dried beans
- Dried beans, especially kidney beans, contain a natural toxin that requires proper handling.
- Soak beans for 12 hours, rinse, then boil on the stove top for at least 10 minutes before adding to your slow cooker.
- Cooking meat and poultry
- According to the USDA Food Safety and Inspection Service, it is safe to cook large cuts of meat and poultry in a slow cooker as long as they are thawed first.
- If frozen pieces are used, they will not reach 140°F quickly enough and could result in a foodborne illness.
- Preheating the slow cooker is especially important when cooking meats and poultry.
- Always follow manufacturer's recipes and safety guidelines.
- Vegetables
- Put vegetables on the bottom or sides of the slow cooker. Vegetables cook the slowest, so placing them near the heat ensures they cook thoroughly.
Cooling and reheating
- Don’t let food cool in the slow cooker, instead:
- Serve immediately or
- Transfer leftovers to a shallow container and refrigerate immediately.
- Don’t reheat food in the slow cooker, instead:
- Reheat food on the stovetop or microwave to at least 165°F
- Then transfer to the slow cooker if you need to keep it warm at 140°F or above.
Use a food thermometer every time you cook or reheat to tell if your food is safely cooked. You can't tell if a food is safely cooked simply by checking its color or texture.
FoodSafety.gov provides guidelines on how to cook raw meat, poultry, seafood and other foods to a safe minimum internal temperature. Always use a food thermometer to check whether meat has reached a safe minimum internal temperature that is hot enough to kill harmful germs that cause food poisoning.
Kitchen timer
A timer is a reminder to check if something is done, but it can also be used to remind cooks to put food away. Many cooks leave food out to cool on the counter, only to discover it still sitting there the next morning. Perishable food is not safe if left out more than two hours; one hour if the temperature is above 90 F.
Dial or digital instant-read thermometers
These quickly measure the temperature of food near the end of the cooking time, and can be used for many thin foods. A dial instant-read thermometer is designed for quick temperature reading.
- Insert the stem until the notch on the side is covered.
- For whole-muscle meats or poultry, insert into the thickest part without touching bone.
- For mixed dishes or casseroles, insert the stem until the notch is covered.
- The temperature should register in about 15 to 20 seconds.
- Insert sideways into thin foods like hamburgers and chicken breasts.
- Wash the stem with soapy water after each use.
Checking the accuracy of a dial food thermometer
Dial thermometers should be checked periodically following the manufacturer’s recommendations. You can also use the following ice water method to test accuracy:
- Fill a large glass with crushed ice.
- Add water to the top of the ice and stir well. Let it stand for three minutes.
- Place the thermometer stem at least two inches into the ice water.
- The thermometer should read 32 F after 30 seconds.
- To calibrate, turn the calibration nut under the dial until the thermometer dial registers 32 F and re-test.
Oven-safe thermometers
Remain in the food during cooking.
If the thermometer is not left in the food during cooking, it can take as long as one to two minutes to register the correct temperature.
Oven-probe-with-cord thermometers
These include a digital probe that is inserted into the food and attached to a long wire that connects to a base unit outside the oven or grill.
Set the desired temperature, and the unit beeps when it reaches that temperature.
Refrigerator and freezer thermometers
Freezer temperatures should be 0 F or lower.
Refrigerator temperature should be at 37 F to 40 F.
Place the thermometer in the front, near the refrigerator door. If the temperature is higher than 40 F, adjust the refrigerator control dial or setting.
Food safety videos
Whether you're preserving food at home or running your own cottage food business, we've created research-based information on hazards, regulations, and processing methods to help keep your food products safe.
Preparing and serving food safely
Sanitizing surfaces
Use a thorough sanitation routine to prevent cross-contamination and cross-contact.
Food temperatures
The temperature danger zone is where foodborne illness-causing microorganisms multiply rapidly.
Cooking for a crowd
Follow these tips to protect you and your guests from foodborne illness
More from the food safety team
Contact for general food safety questions or training opportunities with Extensions. Submit a confidential report to the Minnesota Department of Health if you believe a food or beverage in Minnesota made you sick.