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The quality of Iowa's water is spilling into the state's toss-up governor's race
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− Fresh Air Wild Card with Rachel Martin It's Been a Minute Embedded Get NPR+ More Podcasts & Shows Search Newsletters NPR Shop Get NPR+ Tiny Desk New Music Friday All Songs Considered Music Features Live Sessions About NPR Diversity Support Careers Press Ethics The quality of Iowa’s water is spilling into the state’s toss-up governor’s race In Iowa's competitive governor's race, farmers are raising longstanding concerns over water quality and agriculture's role in ultimately reducing the state's cancer rates.
+ Fresh Air Wild Card with Rachel Martin It's Been a Minute Embedded Get NPR+ More Podcasts & Shows Search Newsletters NPR Shop Get NPR+ Tiny Desk New Music Friday All Songs Considered Music Features Live Sessions About NPR Diversity Support Careers Press Ethics High cancer rates and dirty water: The crisis shaping Iowa’s toss-up governor's race In Iowa, the state's water quality is so concerning that it could play a part in who wins the governor's race.
− National The quality of Iowa's water is spilling into the state's toss-up governor's race July 27, 20264:43 AM ET Heard on Morning Edition By Clay Masters The quality of Iowa’s water is spilling into the state’s toss-up governor’s race Listen · 4:28 4:28 Transcript Toggle more options Download Embed Embed "> <iframe src="https://www.npr.org/player/embed/nx-s1-5900895/nx-s1-9864165" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player"> Transcript In Iowa's competitive governor's race, farmers are raising longstanding concerns over water quality and agriculture's role in ultimately reducing the state's cancer rates.
+ Elections High cancer rates and dirty water: The crisis shaping Iowa's toss-up governor's race July 27, 20264:43 AM ET Heard on Morning Edition From
By
Clay Masters
Members of a youth baseball league play a game near the A.C.
− Sponsor Message Transcript
LEILA FADEL, HOST:
To Iowa now, where there's a competitive governor's race this year.
+ Ward Water Treatment Plant in Des Moines, Iowa in June.
− One of the major issues in the campaign is water quality - specifically how the management of farmland affects the water people drink.
+ Water quality has become an important issue for voters ahead of the 2026 gubernatorial election.
− Minnesota Public Radio's Clay Masters takes us to a soybean field in northern Iowa.
+ KC McGinnis for NPR hide caption
KOSSUTH COUNTY, Iowa — Iowa voters are increasingly raising public health concerns over the state's water quality as the governor's race heats up ahead of November.
− (SOUNDBITE OF INSECT BUZZING)
CLAY MASTERS, BYLINE: Pretty simple. What we're looking at right now is some soybeans, but what's different is that there's not black soil in between the rows - there is last year's corn rotation from 2025.
+ The latest annual report from the Iowa Cancer Registry shows the state has the second-highest rate of cancer in the country and is one of only a few states where cancer rates are on the rise.
− ZACK SMITH: Yeah, the residue that's leftover essentially acting as kind of armor on the soil.
+ Now, the conversation about how water quality in this state, dominated by the agriculture industry, may contribute to the high cancer rates, and how to respond is moving from the farm fields to the governor's race.
− MASTERS: This is Zack Smith.
+ Both candidates for governor, the Democratic nominee Rob Sand and the Republican nominee Zach Lahn say more needs to be done.
On an overcast summer day, farmer Zack Smith crouches between rows of soybeans to demonstrate why he and two other farmers in the region who call themselves the Lobe Rangers are choosing to leave the brown stalks of last year's crops right next to rows of vibrant green soybeans.
"The residue that's left over is essentially acting as kind of an armor on the soil," Smith said.
− He's part of a group of farmers that call themselves the Lobe Rangers.
+ "It equates to when it rains here, more likelihood for the water to go into the soil versus running off,"
This practice, called strip tilling, might not be as aesthetically pleasing as other conventional methods that pull out the roots of dead plants.
But for Smith, the roots of last year's crops are helping lock nitrogen fertilizer into the soil, lowering the risk of it running off and contaminating nearby sources of drinking water.
− That's a nod to the geological region where they farm - the Des Moines Lobe.
+ That's important because nitrate in the soil can travel through underground farm drainage tiles into streams and rivers that eventually turns into drinking water.
Many Iowans also get their water from private wells where water does not have to meet the federal standard.
Smith, along with Matthew Bormann and James Hepp created the Lobe Rangers, a nod to the Des Moines Lobe region where they farm, to advocate for improvements to the state's water quality and influence public opinion and policy in farm country.
James Hepp, Zack Smith, and Matthew Bormann, known as the Lobe Rangers, examine one of Bormann's fields near Bode, Iowa on July 1.
− He's showing me strip-tilling, where farmers plant rows upon rows of vibrant, green soybeans right next to brown residue from last year's crops.
+ KC McGinnis for NPR hide caption
They say they've watched as state lawmakers have implemented voluntary measures to improve water quality and while they are from different political backgrounds, they all agree that conservation practices like strip tilling and planting cover crops need to be more widespread.
Concerns over clean drinking water have become central to both gubernatorial candidates' campaign message.
"I think the Democratic party at its best is the party for the little guy," Sand told a crowd in Corydon, Iowa recently.
− They say it enriches the soil and locks in nitrogen fertilizer.
+ "I'm also a believer that we want to have clean water to fish in and abundant public land to hunt on, and the Democratic Party is more of a supporter of those things."
While Democrats have traditionally raised concerns over environmental pollution, this year, Sand's GOP opponent is trying to upend that convention.
− SMITH: It equates to when it rains here, more likelihood for the water to go into the soil versus running off.
+ "It's gotten to the point where you just can't ignore it anymore, you can't, and I've been trying to talk to Republicans about this every chance I get," Lahn said in an interview with NPR.
− MASTERS: That's important because nitrate in the soil can travel through underground farm drainage tiles into streams and rivers that eventually gets turned into drinking water.
+ Republican gubernatorial candidate Zach Lahn speaks to supporters during his election watch party on June 2 in West Des Moines, Iowa.
− There are many Iowans who get their water from private wells where water does not have to meet the federal standard.
+ Cody Scanlan/The Register/USA TODAY Network via Reuters hide caption
So far, both candidates have largely focused on voluntary or incentivized measures to improve water quality.
But the Lobe Rangers say voluntary conservation isn't enough.
Bormann, a fifth generation farmer, has been farming in Iowa for more than 25 years and previously served as president of the Kossuth County Farm Bureau.
Yet, he says, it's often farmers with the state's agricultural groups who "aren't ready" for change.
− Studies show there's a connection between consuming water with high nitrates over time and certain forms of cancer.
+ Bormann points to trade associations like the Iowa Farm Bureau and the Iowa Corn Growers Association.
− Iowa continues to have the second-highest rate of cancer in the country and is one of a few states that has rising rates of cancer. That's according to an annual report by the Cancer Registry. David Cwiertny runs the University of Iowa's Center for Health Effects of Environmental Contamination.
+ "They think if they can just avoid it, you know, and steer the group, the ag group, you know, steer them to avoid it, or to green wash the message then it's going to go away, but this isn't going away anymore," Bormann said.
− DAVID CWIERTNY: I think what's most sort of bothersome to me is that when, you know, the EPA acknowledges that that science is there and it needs to be studied to determine if the standard is sufficiently protective to public health and then that doesn't get done, it leaves, you know, water providers in Iowa in a tough spot. It leaves consumers in Iowa in a very difficult position.
+ NPR reached out to the Iowa Farm Bureau and the Iowa Corn Growers Association for comment but did not hear back.
− MASTERS: There are strategies to curb farm pollutants like nitrogen and phosphorus but implementing them here is largely voluntary. That's something many voters want to address in the state's race for governor.
+ The Iowa Farm Bureau and Corn Growers, along with other industry groups, submitted an op-ed to several Iowa newspapers last year writing that nitrate levels "naturally fluctuate seasonally, especially during heavy rainfall, but have remained relatively stable."
A report from the Iowa Department of Natural Resources showed Iowa had 36 nitrate-related drinking water violations in 2025, which is more than double the number reported in 2024.
− (SOUNDBITE OF ARCHIVED RECORDING)
UNIDENTIFIED GROUP: (Singing) America, America, God shed His grace on thee.
+ More than a decade ago, the state acknowledged the need for new conservation efforts by creating the Iowa Nutrient Reduction Strategy, a voluntary plan aimed at reducing nitrogen and phosphorus runoff on farms.
− MASTERS: It came up at this town hall in the small, southern Iowa town of Corydon (ph).
+ But adoption has lagged behind the level researchers say is needed to significantly reduce nitrate pollution.
In 2023, Iowa Public Radio spoke to experts about the effectiveness of the program and found that while nitrogen levels were up and down during that time, there was no significant change.
Soybeans grow on Matthew Bormann's farm near Bode, Iowa.
− The Democratic candidate is the state auditor, Rob Sand.
+ Zack Smith, Bormann, and James Hepp, known as the Lobe Rangers, advocate for farming practices — including strip till farming, evidenced here by the partial corn stalks left over from the previous year's field — that reduce nutrient runoff, which can improve soil and water quality.
− In Iowa, where Republicans outnumber Democrats, Sand is running as a moderate and needs Republican support if he wants to win.
+ KC McGinnis for NPR hide caption
David Cwiertny, who directs the University of Iowa's Center for Health Effects of Environmental Contamination, says studies have found links between elevated nitrate levels in drinking water and long-term health risks that are not reflected in current federal drinking water standards.
− ROB SAND: Nitrates do, at a certain point, cause cancer.
+ "What's most bothersome to me is that when you know the EPA acknowledges the science is there and it needs to be studied to determine if the standard is sufficiently protected to public health," Cwiertny said.
− What that level is is something that is an item for discussion.
+ "Then that doesn't get done, it leaves you know, water providers in Iowa in a tough spot.
− But at the same time, we also see nitrate levels in Iowa that are above even the high level of where people think that link is for safe consumption.
+ It leaves consumers in Iowa in a very difficult position."
Des Moines Water Works, a public water utility, has a long history of treating nitrates in its water supply in the Des Moines and Raccoon Rivers.
− MASTERS: Sand is also quick to tell me politicians are the problem, not farmers.
+ The U.S.
− He and the GOP gubernatorial nominee are both calling for the funding of a water-quality program that was passed by voters in 2010 but never funded by the state's legislature. His Republican opponent also identifies with the goals of the MAHA movement.
+ Environmental Protection Agency sets legal nitrate limits in public drinking water at 10 milligrams per liter.
− ZACH LAHN: We're not allowing Mother Nature, we're not allowing God to purify the water by allowing it to sift through the substrate into the aquifers.
+ For the past two summers, nitrate readings in the rivers have spiked above that limit, reaching some of their highest levels in over a decade.
− MASTERS: That's Zach Lahn, who narrowly won the crowded Republican primary, beating out a congressman backed by President Trump.
+ A tank from the A.C.
− The MAHA pack endorsed Lahn, and during his victory speech, he talked about taking on the big ag cartels.
+ Ward Water Treatment Plant is seen in Des Moines in June.
− And he tells me the state has to look at its agricultural practices.
+ Des Moines Water Works has long treated nitrates in its water supply in the Des Moines and Raccoon Rivers. KC McGinnis for NPR hide caption
That led to lawn watering bans in the Des Moines metro area so that drinking water treatment facilities could keep up with removing nitrates.
− LAHN: It doesn't matter how low your taxes are.
+ All water use restrictions were lifted earlier this week.
− If your kids are leaving and your people are dying, you're not winning.
+ The regional drinking water authority, Central Iowa Water Works, says nitrate concentrations in its main sources dropped below the EPA's limit.
− MASTERS: Back on the Lobe Rangers farm, Matt Bormann says he hopes the conversation on the campaign trail leads to change.
+ While the situation has improved, CIWW says it plans to expand its nitrate removal facility.
− MATT BORMANN: The fact that we're talking about it denotes that there's a problem, and we just got to get more people on board to do something about it.
+ Elections Here's a look at the 36 races for governor this year Water quality frequently surfaces at campaign events, including town halls held by Democratic candidate and State Auditor Rob Sand.
− MASTERS: The Lobe Rangers have picked up a following online with their videos highlighting their take on how farmers can play a part in clean water.
+ Sand has made improving water quality part of his campaign while positioning himself as a moderate capable of attracting Republican voters in a state that has marched to the right over the last decade.
Iowa gubernatorial candidate Rob Sand campaigns in Corydon, Iowa on June 29.
− While they're not endorsing, Sand just appeared in photos with them and Lahn is going to meet with them soon. One thing is clear - the quality of water runs to the governor's office in Des Moines this year.
+ KC McGinnis for NPR hide caption
"Nitrates do, at a certain point, cause cancer," Sand told NPR before a town hall last month in Corydon, Iowa.
− For NPR News, I'm Clay Masters in Kossuth County, Iowa.
+ "What that level is, is something that is an item for discussion, but at the same time, we also see nitrate levels in Iowa that are above even the high level of where people think that link is for safe consumption," Sand said.
− (SOUNDBITE OF AIRELLE BESSON & NELSON VERAS' "FULL MOON IN K.") Copyright © 2026 NPR.
+ Sand has proposed tax incentives to encourage landowners to convert more acreage into wetlands, which naturally filter water before it reaches rivers and streams.
He and his Republican opponent have also called for funding a statewide water quality program that voters approved 16 years ago that has never received funding.
Rob Sand, the Democratic candidate for governor, participates in a roundtable on cancer in Iowa on July 28 in Des Moines.
− All rights reserved.
+ Natalie Krebs/Iowa Public Radio hide caption
Rob Sand, the Democratic candidate for governor, participates in a roundtable on cancer in Iowa on July 28 in Des Moines.
− Visit our website terms of use and permissions pages at www.npr.org for further information.
+ Natalie Krebs/Iowa Public Radio hide caption
Zach Lahn made Iowa's water quality and rising cancer rates central themes of his campaign after winning a crowded GOP primary in June.
− Accuracy and availability of NPR transcripts may vary.
+ He narrowly defeated Congressman Randy Feenstra who had the backing of President Trump.
− Transcript text may be revised to correct errors or match updates to audio.
+ Trump has since endorsed Lahn.
Lahn was also endorsed by the MAHA-PAC, a super PAC aligned with Health Secretary Robert F.
− Audio on npr.org may be edited after its original broadcast or publication.
+ Kennedy's "Make America Healthy Again" movement.
"It doesn't matter how low your taxes are.
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+ If your kids are leaving, your people are dying, you're not winning," Lahn said.
Back on the farm in north central Iowa, the Lobe Rangers say the growing attention to water quality is encouraging.
"So the fact that we're talking about it denotes that there's a problem, and we just got to get more people on board to do something about it," Bormann said.
The farmers have built an online following by posting videos about agriculture's role in protecting water quality and while they're not endorsing candidates, they've agreed to meet with both Sand and Lahn.
Iowa Public Radio's Rachel Cramer contributed to this report.
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