By Nina B. Elkadi for Sentient.
Broadcast version by Judith Ruiz-Branch for Wisconsin News Connection reporting for the Sentient-Public News Service Collaboration

At least eight miles of a Southwest-Wisconsin stream were polluted by a manure spill earlier this month. The spill killed hundreds of fish, including many wild brown trout. The affected waterways — Spring Valley Creek, Moore Creek and the Kickapoo River — have long been remarkable for their healthy water quality, healthy enough to sustain naturally-reproducing trout populations. The source of the spill appears to be manure applied to fields by a 600-head dairy operation near Norwalk, Ben Uvaas, who works at the Wisconsin Department of Natural Resources (DNR), tells Sentient. A “gully washer,” or massive rain event, appears to have triggered the runoff, he says. Though the farmer of the dairy operation took measures to protect soil health, the combination of heavy rains and 11,500 gallons of applied manure per acre were enough to trigger a spill.

This year, there have been at least 9 documented manure spills in Wisconsin, according to the DNR. The Kickapoo River, where some of this manure was observed, eventually carries water all the way to the Gulf of Mexico. Contaminants like manure and other agricultural byproducts contribute to an oxygen-depleted area known as the “dead zone” that can kill marine life. In 2024, the dead zone spanned 6,705 square miles.

On May 17, the DNR received a call about this spill to their violation tip line. The warden who received the call — a law enforcement official tasked with enforcing natural resources laws — went out to the stream, where they observed the hundreds of dead fish.

Uvaas works on the state DNR’s non-point source pollution program, referring to the kind of pollution that tends to be carried by rain or snowfall, according to the Environmental Protection Agency. The warden was able to track the source back to a farm field in Monroe County, southwest of Norwalk, Uvaas says. Wisconsin Public Radio reported the farm as Brueggen Dairy Farm, a 600-head cow operation.

Brueggen Dairy is not considered a concentrated animal feeding operation as it falls under the 700-head dairy threshold set by the EPA. In 2022, the operation received the Monroe County Conservation Farmers of the Year award.

On Monday, May 19, the DNR fisheries team examined most of the area — collecting hundreds of dead fish along the way. Spring Valley Creek, Moore Creek and the Kickapoo River, where the spill occurred, are prized trout habitats in a region that is a destination for fishers and other recreationalists.

So far, the investigation has determined that the week of May 11, a farmer injected approximately 11,500 gallons of manure, per acre, to around 130 acres of farmland. A Wisconsin DNR official recently said that anywhere from 12,000 to 15,000 gallons per acre is acceptable.

On May 14, the rain storm hit. Farmers frequently apply manure to their fields as fertilizer, but over-application can contaminate drinking water with nitrates, and high levels of ammonia can kill fish and other wildlife.

The farmer had been performing a range of what Uvaas describes as “soil health” practices meant to improve soil structure and the amount of manure applied does not appear to be beyond acceptable ranges. But the spill occurred anyway, illustrating that manure application has the potential to go wrong.

“Despite all our efforts to find the best time to apply (manure), Mother Nature is unpredictable,” Farm owner Randy Brueggen wrote in a statement to Wisconsin Public Radio.

“We as a dairy farm know how valuable this resource is, which is why we utilize incorporation practices in an intentional, safe and compliant manner,” Brueggen continued. “We strive to utilize our organic fertilizer over synthetic fertilizer for our crops. Our group’s farming practices always prioritize conservation. We want to sustain the land, so the land sustains us.”

In Wisconsin, “more than 1,500 miles of streams and rivers, and 33 lakes, in the nine counties assessed have impaired waters due overwhelmingly to combined pollution from manure and commercial fertilizer,” a 2022 investigation by the non-profit Environmental Working Group and non-profit law group Midwest Environmental Advocates found.

In the Driftless region of the Midwest, an area that covers parts of Northeast Iowa, Southwest Wisconsin and Southeast Minnesota, pollution containment and cleanup is especially difficult, Uvaas says. Unlike the rolling hills and lush soils of the Corn Belt, the karst topography is characterized by natural spring-fed streams, rocky bluffs and a thin layer of topsoil.

As a result, the streams are “fairly high gradient” and “high velocity,” says Uvaas, and this creates “an extremely narrow window” for response time, at least “compared to other parts of the state.” In the flatter parts of Wisconsin for instance, officials can put in barriers and collection sumps to collect contamination. But by the time DNR officials got to this site, it was too late. “There’s not any kind of collection or containment that’s feasible in the waterway, which is unfortunate, but that’s largely driven by timing and the topography here.”

Sentient is awaiting records from the Wisconsin DNR for more information regarding this spill, including enforcement action.


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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