Nitrate

The Cancer in Iowa Report published annually by the Iowa Cancer Registry gives an overview of the current burden of cancer in the state. This year's report features findings from the Agricultural Health Study, one of the world's largest and longest-running active studies of agricultural exposures and health. We talk with Iowa Cancer Registry Director Mary Charlton about this year's report which estimates this year that 21,700 Iowans will be diagnosed with cancer and 6,400 Iowans will die of cancer. We'll also talk with principal investigator of the Agricultural Health Study Laura Beane Freeman about the findings from their study that began in the mid-1990s with participants from Iowa and North Carolina. David Cwiertny of the University of Iowa's Center for Health Effects of Environmental Contamination also joins to discuss various environmental factors in the state that may be contributing to cancer diagnoses.

Corn growers in the Midwest are testing whether they can use less fertilizer and still maintain yields or improve their bottom line through on-farm research trials. The project is designed for producers who use practices to boost soil health.

Iowa’s House and Senate leaders said Thursday they need more time to review an executive order signed by President Donald Trump that aims to increase the supply of glyphosate-based weedkillers in the U.S. It comes as the state Legislature decides whether to shield pesticide companies from certain lawsuits.

Elevated nitrate levels in the Des Moines and Raccoon rivers prompted Central Iowa Water Works to start up its nitrate removal system this month. A network of water quality sensors shows a similar uptick in other streams and rivers across state.

The central Iowa community of Perry officially opened a $30 million treatment plant that helps meet the state’s goals to reduce pollution from wastewater. City officials said it also increases their capacity to attract new companies and accommodate residential growth.

A fertilizer spill killed hundreds of thousands of fish in southwest Iowa last year. Now, a group of locals are building a network of citizen scientists and advocates for clean water.

Roughly 25% to 50% of the total commercial nitrogen applied to fields across the state occurs in the fall. Waiting for cooler soil temperatures helps prevent nitrates from flushing into streams and rivers.

Water restrictions for nearly a fifth of the Iowa’s population brought the state’s nitrate challenges to the forefront. Water quality experts say certain practices higher up in the watershed could make a difference if they are scaled up.

Scientists discussed pollution, bacteria and other challenges plaguing central Iowa's rivers at an event in Des Moines Monday. The presenters contributed to a two-year assessment of the Des Moines and Raccoon rivers, which includes recommendations at the local, regional and state level.

Nitrates, fecal bacteria, sediment and other pollutants in the Des Moines and Raccoon rivers threaten safe drinking water for 20% of the state’s population. That's one of the findings from a sweeping study commissioned by Polk County supervisors.