Nitrates linked to cancer found in Des Moines water supply for 2nd time in 30 years

Des Moines, Iowa, faces a rare water quality issue as nitrates, linked to cancer and other health risks, were found in the city's drinking water. This marks only the second occurrence in 30 years. Filtration efforts are underway, but challenges persist, with rising costs and concerns over agricultural practices.

Des Moines, Iowa, has recently encountered a rare water quality issue as harmful nitrates were detected and removed from the city's drinking water. This marked only the second occurrence of such a situation in the last 30 years, as reported by the Associated Press.

Winter Filtration Efforts

The nitrate removal process took place during the winter months of January and February this year. The operation of the filtration system incurred a daily cost of approximately $16,000, which could potentially lead to increased water bills for Des Moines residents. Authorities underscored the importance of these filtration measures, as nitrates in drinking water are linked to severe health risks.

According to an analysis by Polk County in 2025, which examined the Raccoon and Des Moines rivers in Central Iowa, exposure to nitrates can contribute to various health conditions, including cancer, thyroid diseases, and blood disorders. One particularly dangerous condition associated with nitrate exposure is "blue baby syndrome," which can be fatal for infants.

Root Causes of Nitrate Contamination

Although filtration effectively removes nitrates from water, it does not address the underlying sources of contamination. The primary factor behind this issue is related to agricultural practices. Warmer winter temperatures have affected crop production dynamics, leading to a greater reliance on chemical fertilizers and pesticides. When farmland is not frozen consistently during the winter months, precipitation and snowmelt transport these chemicals directly into rivers and streams, contributing to nitrate contamination in the water supply.

Potential Increase in Winter Pollution Events

The Iowa Department of Agriculture and Land Stewardship has expressed concern that such nitrate pollution events may become more frequent in the future. State climatologist Justin Glisan informed the Associated Press that while these events will not occur every year, the conditions are in place for them to potentially happen more often. This issue poses significant concerns for small communities that lack advanced filtration systems, as well as for the 43 million Americans who rely on private wells for their water supply, according to the U.S. Geological Survey.

Community Reactions

In response to the nitrate contamination issue, some residents have suggested the installation of whole-home filtration systems for private wells, particularly in rural areas. However, there are concerns over the affordability of such solutions for many households.

Official Response

Amy Kahler, CEO and general manager of Des Moines Water Works, emphasized the importance of holding polluters accountable and addressing the issue through systemic solutions. She outlined two potential approaches to tackling the problem:

• Implementing conservation efforts and responsible watershed practices.
• Investing hundreds of millions of dollars into treatment infrastructure to manage nitrate contamination.

The city faces a complex challenge in balancing public health, environmental responsibility, and the economic costs associated with nitrate filtration. Given that agricultural activities are integral to Iowa's economy, ongoing monitoring and preventative measures will likely continue to be a priority for the foreseeable future.

Sources:

• Associated Press
• Des Moines Register
• Iowa Department of Natural Resources
• Cancer-causing nitrates discovered in Des Moines water supply for only the 2nd time in 3 decades