A recent report from the Iowa Cancer Registry indicates that an estimated 6,400 Iowans are projected to die from cancer in 2026, which is an increase of 100 deaths compared to the previous year. The report, published on March 13, 2026, also predicts that 21,700 new cancer cases will be diagnosed among residents of Iowa.
In Johnson County alone, the report estimates that 165 individuals will succumb to cancer, with approximately 6,795 survivors expected to be living with the disease. The data highlights an ongoing public health challenge in the state, where cancer rates remain concerningly high.
Collaboration with Agricultural Health Study
This year, the Iowa Cancer Registry partnered with the Agricultural Health Study, an ongoing research initiative examining how agricultural practices impact the health of farmers in Iowa and North Carolina. Mary Charlton, a professor of epidemiology in the College of Public Health and co-author of the report, stated that the collaboration arose from increasing public concern regarding pesticide exposure among farming communities.
Since its inception in the mid-1990s, the Agricultural Health Study has enrolled 31,433 male farmers and 22,145 female participants, including spouses. Participants were eligible if they obtained or renewed a pesticide license, facilitating a comprehensive examination of health effects related to pesticide use.
The study’s findings revealed that farmers had approximately 13 percent fewer cancer cases than expected when compared to the general population of Iowa. Spouses of farmers also exhibited a 10 percent reduction in cancer incidence. These lower rates may be attributed to the “healthy worker effect,” suggesting that individuals in physically demanding occupations, such as farming, often maintain better health due to the physical requirements of their jobs.
Charlton noted, “Even though these are people who are the most highly exposed population to pesticides, when you sort of put it all together in a healthier cohort that’s more active, overall, they’re getting cancer less.”
Complexities of Cancer Risk Factors
Despite the lower-than-expected cancer rates among study participants, Iowa continues to have the second-highest cancer rate in the United States. Charlton emphasized the complicated relationship between pesticide exposure and cancer, highlighting that not all chemicals are carcinogenic.
“Cancer is not one disease. Cancer is hundreds, if not thousands, of diseases,” she explained. The nuanced relationship between specific pesticides and cancer types requires extensive research and time to establish clear links.
Additionally, Charlton pointed to nitrate runoff into water supplies as a significant potential contributor to cancer rates in Iowa. She expressed concern over the state’s lack of comprehensive data regarding water sources and their associated cancer risks.
“There’s not really a good database that tracks all your exposures over your lifetime. And cancer takes decades to develop into a larger problem,” she noted.
Charlton also criticized Iowa’s pesticide reporting system, which she described as less sophisticated compared to systems in states like California. More granular reporting could help identify the timing and location of pesticide applications, allowing researchers to better understand their health impacts on nearby populations.
Charlton concluded by reaffirming the importance of addressing public concerns regarding environmental risk factors. “We know that Iowans are concerned about environmental risk factors, and we hope this report provides some helpful context while reinforcing the need for more research and data collection in that area,” she said.
The report serves as a call to action for further investigation into cancer trends and environmental influences in Iowa, emphasizing the continued need for rigorous research to protect public health.
