Hydroponic farms and locally grown produce are gaining attention as safer alternatives during foodborne illness outbreaks, but experts say the real protection lies in reducing the number of times food is handled before it reaches your plate. The distinction between where lettuce is grown and how it's processed matters far more than many shoppers realize, especially when facing pathogens like Cyclospora that resist standard commercial washing.

Why This Summer's Cyclospora Outbreak Changed How People Shop?

The largest Cyclospora outbreak ever tracked in the United States has sickened 10,930 people across 17 states, including North Carolina, with at least 454 hospitalizations and two deaths. The outbreak, linked to iceberg lettuce sourced from central Mexico, has left consumers questioning whether the food system is truly safe. At farmers markets in Raleigh, North Carolina, shoppers are deliberately seeking out local lettuce and herbs, hoping to avoid the contaminated products that triggered the outbreak.

But the anxiety extends beyond this single outbreak. A series of concurrent foodborne illness investigations has created a cluster of active recalls and illnesses. A Salmonella outbreak linked to jalapeños imported from Sinaloa, Mexico, has infected 431 people across 32 states as of August 21, with 57 hospitalizations. Frozen blueberries have been linked to E. coli contamination, resulting in 12 illnesses and four hospitalizations in Florida and Georgia. Alfalfa sprouts have sickened 55 people across 15 states with Shiga toxin-producing E. coli and Salmonella, with four hospitalizations.

Can Hydroponic Farms Really Eliminate Foodborne Illness Risk?

Inside a shipping container in downtown Raleigh, lettuce grows vertically under LED lights with no soil, rain, or outdoor exposure. At Nanue Farms, water mixed with nutrients drips through panels to plant roots, then drains and recirculates through the system. This controlled environment agriculture removes many variables that outdoor farmers cannot control.

The appeal is clear: hydroponic operations eliminate wildlife, pests, and bugs that can introduce pathogens to crops. Traditional farms must account for potential contamination from animals, irrigation water, and soil. Listeria monocytogenes occurs naturally in soil, while E. coli can be associated with cattle and Salmonella with poultry. Water has been a particularly important pathway in large outbreaks, according to food safety experts.

However, moving lettuce indoors does not eliminate risk; it simply changes the type of risk. Hydroponic operations still have workers, equipment, and surfaces that can introduce contamination. Indoor growers face their own pest-control challenges, and water, particularly in recirculated systems, must be carefully managed. At Nanue Farms, water tanks are flushed and cleaned monthly, and growing areas are cleaned regularly, but this level of care is not universal across all hydroponic operations.

"I wouldn't say that hydroponics are any better than any other. Each different way that produce is grown has its own risks," explained Chip Simmons, an area specialized agent at North Carolina State University who focuses on fresh produce food safety.

Chip Simmons, Area Specialized Agent, North Carolina State University

For Simmons, the critical distinction is not whether a farm is indoors or outdoors, but whether growers identify the risks particular to their operation and follow good agricultural practices, including worker hygiene, water testing, sanitation, and animal or pest control.

Why 'Triple Washed' Lettuce Doesn't Stop Cyclospora?

The commercial washing process typically involves rinsing produce with water, then a sanitizer, then rinsing again. However, Cyclospora is a microscopic parasite spread when food or water is contaminated with feces from an infected person, and it is not susceptible to the sanitizers used in standard commercial washing. Unlike bacteria such as Salmonella or E. coli, Cyclospora has humans as its only known host.

This creates a troubling scenario in processing facilities. When contaminated lettuce enters a facility, washing it does not necessarily solve the problem. Instead, moving chopped lettuce through the processing and washing system can spread contamination to other produce. With each washing step, a pathogen like Cyclospora that resists the sanitizer is simply being spread to all of the produce in the facility.

Once contaminated lettuce enters a large distribution network, a localized contamination problem can become a multistate outbreak. This makes the number of "touch points" in the food supply chain critically important. A head of lettuce harvested from a nearby farm and sold whole may have relatively few touch points. A bagged salad, by contrast, could be harvested, transported to a processing facility, chopped, washed, handled by equipment, packaged, moved through distribution centers, and shipped hundreds or thousands of miles before reaching a refrigerator.

How to Reduce Your Risk of Foodborne Illness?

• Wash Produce Thoroughly: Use cool or cold water and rub produce with your hands or use a dry brush to scrape off dirt. Washing your hands first is essential before handling any fresh produce.
• Buy Local When Possible: Locally grown produce has fewer touch points for contamination and a shorter journey from farm to plate. Cyclospora is endemic in tropical and subtropical regions but not in North Carolina, making the likelihood of encountering it on locally grown produce lower than on produce from areas where the parasite regularly circulates.
• Choose Whole Heads Over Pre-Cut Bags: Buying a whole head of lettuce rather than a pre-cut bag eliminates some of the processing steps where contamination can spread.
• Stay Informed About Recalls: Check FDA and USDA recall alerts regularly and remove any recalled products from your home immediately.
• Don't Skip Fruits and Vegetables: Despite outbreak concerns, children and adults need the vitamins and minerals that fruits and vegetables provide. The food system in the United States has many safeguards in place to catch and stop outbreaks.

The U.S. food safety system involves multiple agencies working together. The Centers for Disease Control and Prevention (CDC) works with state and local health departments, the Food and Drug Administration (FDA), and the U.S. Department of Agriculture's (USDA) Food Safety and Inspection Service during multistate foodborne outbreak investigations. The CDC detects outbreaks and analyzes illness data, state and local agencies collect information from patients and test food, while the FDA and USDA-FSIS conduct traceback investigations, inspect facilities, and request recalls.

However, this complexity means that a single contamination problem can result in multiple recalls involving different companies and products. The jalapeño outbreak illustrates this clearly: one contaminated ingredient resulted in a growing number of recalls across the food supply chain, including prepared foods, salsa, guacamole, and pico de gallo, while hundreds of people became sick.

"There's a lot of different risk factors, and no food system can be entirely 100% safe all of the time. There are too many moving parts and variables for us to pay attention to," noted Rachel Dumene, communications specialist with the Virginia Department of Health's Central Shenandoah Health District.

Rachel Dumene, Communications Specialist, Virginia Department of Health's Central Shenandoah Health District

For consumers trying to reduce their risk during outbreaks, the more meaningful distinction may not be hydroponic versus field-grown produce. It may be local versus a long supply chain. Particularly with Cyclospora, there are fewer risks from buying local because there are fewer touch points for contamination. That does not mean imported produce is subject to weaker food safety standards; the federal Food Safety Modernization Act applies to food grown domestically and food imported for U.S. consumers.

The key takeaway is that food safety is not a single factor but a combination of where produce is grown, how it is processed, how it is transported, and how consumers handle it at home. By understanding these factors and taking simple precautions like washing produce and staying informed about recalls, consumers can reduce their risk while still enjoying the nutritional benefits of fresh fruits and vegetables.