By Nina B. Elkadi for Sentient.
Broadcast version by Mark Moran for Iowa News Service reporting for the Sentient-Public News Service Collaboration

Iowa has a cancer problem: over 20,000 people are expected to be diagnosed with cancer in the next year, with over 6,000 likely to die from the disease. One of the most frequently cited reports in the state is produced by the Iowa Cancer Registry, which has historically refrained from mentioning agriculture as a potential factor in increasing cancer risk. Yet farming is the dominant industry in the state — over 85 percent of the land is devoted to agricultural use and millions of animals are raised on factory farms contributing to environmental pollution. A new initiative, co-developed by The Harkin Institute at Drake University and the nonprofit Iowa Environmental Council, aims to fill this gap and hone in on the role agriculture plays in increasing cancer risk. The initiative was announced at a conference on water quality, held at The Harkin Institute on April 16.

“Even though there are lots of groups talking about studying the high cancer rates, there are some groups that want to limit what we’re looking at when we’re having these conversations,” Adam Shriver, Director of Wellness and Nutrition Policy at The Harkin Institute, said at the conference. “They might want to look at personal behaviors like going to tanning beds or smoking or drinking. And we feel like there’s a really important part of the conversation that’s being left out.”

While behaviors like smoking and binge drinking are linked to higher cancer risk, the new initiative wants to see the link between agriculture and cancer investigated with the same rigor, especially given the prominent role of industrial animal agriculture in Iowa.

The overwhelming majority — 99 percent — of farmed animals in the U.S. are raised in factory farms. In Iowa, there are almost 124 million farm animals at any given time — around 55 million chickens, 53.4 million hogs, 11.5 million turkeys and 3.7 million cattle and cows. Manure spills are commonplace: a recent report by Food and Water Watch found that from 2013 to 2023, there were 179 documented manure spills that killed almost 2 million fish.

Sarah Green, Executive Director of the Iowa Environmental Council, tells conference attendees that Iowa’s cancer rate is not the only outlier statistic about the state. “Iowa has the most factory farm waste of any other state in the country. Iowa has more concentrated animal feeding operations than any other state in the country. Iowa is among the top five states with the highest industrial pesticide use,” she said. “What role do these factors play in Iowa’s cancer rates? What else might be at play?”

In Iowa, waterways are just as impaired as the health of its residents. Almost 2 million fish were killed from the manure spills that occurred in Iowa between 2013 and 2023. The 179 spills were documented throughout the state, with a major hotspot for spills in Iowa’s northwest corner, where hog and other livestock operations are especially dense. Earlier this year, the group reported that Iowa factory farms produce more waste than any other state, at 109 billion pounds of manure annually, based on U.S. Department of Agriculture data. In March, just one manure spill in northeast Iowa killed over 100,000 fish.

For the new initiative, researchers will conduct a review of existing scientific studies and reports for what the research shows (and what it doesn’t) about the connection between agriculture, both row crop and livestock operations, and cancer in the state. The next step is to determine whether there is sufficient evidence based on the review to recommend stronger public health policy. 

The project will also host 15 listening sessions around the state to allow Iowans to “share and record their lived experiences with cancer,” Green said. Public awareness is at the heart of the project. “This entire initiative is about each of you and about Iowans, making people’s lives better, giving families more years to make memories together, helping Iowans from all walks of life have healthier, longer futures in our state,” Green said. “The cancer crisis touches every single county in Iowa.”

The initiative is funded by the Walton Foundation, which provides funding to organizations working to protect rivers, “oceans and the communities they support,” as well as philanthropic organizations Builders Vision and Grace Communications and Iowa Radiology, a radiology imaging practice. Disclosure: Builders Vision and Grace Communications are donors to Sentient; donors have no say over Sentient’s editorial coverage or content.

In an email to Sentient, Jim Larew, legal counsel for the nonprofit environmental advocacy group Driftless Water Defenders, praised the new initiative, noting “those holding visible and prominent positions in cancer research in Iowa” have focused their attention on binge drinking, making no mention of industrialized agriculture. A more “objective” review is necessary, he wrote.

“Established institutions have a tendency to avoid naming environmental causes of cancer, which normally can be addressed by policy changes and, instead, point to behavioral contributors to new cancers. Such tendencies have the effect of insulating the investigating institutions from intense political pressures exerted by powerful industrial-agricultural oligarchs,” Larew wrote.

Shriver told Sentient in an email that the plan is to have the report on the literature review completed by fall of this year.


Nina B. Elkadi wrote this article for Sentient.


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Wisconsin's agriculture industry could see both wins and losses under the new federal budget.

Climate change isn't a priority for the Trump administration, so the new budget redirects funds for farm conservation initiatives. Chuck Anderas, policy director for the Michael Fields Agricultural Institute, said it lacks investments in key areas, such as technical assistance, to help farmers implement conservation measures.

Anderas predicted the gutted support - and incentives that will go to large farms that need it least - will weaken conservation efforts and could have long-term implications.

"And so, you're having more runoff and more nitrates in the drinking water," he said. "But then you're also having birth defects in babies from the nitrates in the drinking water, and you're having huge medical costs beyond the devastating effects to human health from that."

Wisconsin's new state budget does include some funding for programs that incentivize farmers to use conservation practices and reduce nitrogen pollution. Anderas said this kind of investment will help prevent flood damage, improve water quality and make agricultural systems more resilient - all of which affect public health.

As part of its agenda to curb government fraud and waste, the Trump administration has slashed staffing at agencies such as the U.S. Department of Agriculture's Natural Resources Conservation Service. The new budget proposes cutting nearly one-third of additional staff.

Anderas says that agency provides critical technical assistance to farmers - and the lack of support will create barriers for farmers who rely on its guidance.

"Everybody downstream from a farmer doing conservation practices benefits from that, because there's less water running off their fields, there's less nitrates in the drinking water, there's less phosphorus in our streams and rivers," he said. "And the very best people helping people to do that have been NRCS staff."

Anderas said the new federal ag budget appears to mostly benefit large farms through commodity payments and crop insurance, while small and midsize farms primarily rely on conservation programs.

"And a lot of that's been paid for at the expense of SNAP benefits," he said. "And so, that's basically the choice that's been made in this budget bill is, continue investing more and more in the largest farms, and invest less in people and in small and medium-sized farms."

He added that the new federal budget also redirects Biden-era conservation funds that hadn't yet been used away from practices that would reduce greenhouse gas emissions on farms.

Hoosier businesses across the state are feeling the ripple effects of rising tariffs and shifting trade policies, especially in farming, manufacturing and retail.

Aaron Lehman is president of the Iowa Farmers Union, but his concerns extend across state lines.

"We put off buying machinery and making other farm improvements," he said. "We're less likely to support our local suppliers and manufacturers. Sometimes we even put off bringing the next generation onto the farm."

Indiana ranks in the top 10 nationally for corn and soybean production, two markets directly hit by trade volatility. Supporters of tariffs say they protect U.S. jobs and fight unfair trade. However, small business owners in other states say rising costs and unpredictability are hindering their growth.

Americans voiced concerns during a call organized by Farmers for Free Trade and Tariffs Cost US.

Indiana distillers and retailers that rely on exports and imported materials could face similar risks. Nick Colombo, co-founder of Switchgrass Spirits in Missouri, said uncertainty from tariffs is impacting the way he does business.

"We are no longer trying to sell our goods outside of this country," he said. "That's a huge mess not only for us but also for the people we buy grain from and the people we buy barrels from."

Business owners nationwide say they need trade stability to hire, invest and grow.


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Iowa is the nation's number one corn and soybean producer and federal polices are designed to keep it that way but more farmers are moving away from traditional crops to protect the state's waterways.

Corn and soybeans both require a lot of fertilizer, which eventually seeps into groundwater.

Lee Tesdell, owner and operator of the 80-acre Tesdell Century Farm, in rural Slater, about 30 miles north of Des Moines, has adopted conservation methods. Instead of relying on the "big two" crops, he sites research at Iowa State University that says a four-crop rotation could reduce the amount of fertilizer farmers need.

"Soybeans, corn, oats and alfalfa would be just as profitable," Tesdell pointed out. "Yields would be similar (to) a corn-soy, corn-soy, corn-soy, or corn-on-corn."

Some farmers have pushed back on moving away from corn and soybeans because they have been so reliable and profitable for generations. Adding new crops also means adding new costs.

Tesdell noted pollution from fertilizer runoff has become so bad in Iowa, the state's largest utility company has banned lawn watering to reduce nitrates in groundwater.

"Central Iowa Water Works cannot produce enough potable water every day to both send us good drinking water and enough water to water our lawns that's below 10 milligrams per liter, which is the EPA standard for drinking water," Tesdell explained.

Gov. Kim Reynolds recently vetoed a bill which would have banned companies from using eminent domain to construct CO2 pipelines on Iowa farmland, further promoting fertilizer-hungry corn and soybean production which can threaten Iowa's waterways.


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