The Raccoon River weaves past downtown Des Moines, Iowa, in June. One of the primary drinking water sources for the region, the river has high nitrate levels that have led to water restrictions for some 600,000 customers. (Photo by Cami Koons/Iowa Capital Dispatch)

For nearly a month, hundreds of thousands of Iowans have not been allowed to water their lawns — even though there’s no drought.

Local authorities previously asked the public to refrain from washing cars and filling pools. And some cities turned off splash pads in the height of summer heat.

While such measures are common during dry periods, there’s no shortage of water: Rather, the water in and around Des Moines contains too much nitrate, a natural component of soil and a byproduct of commercial fertilizer and livestock manure. Persistent rainfall has flushed nutrients out of fertilized fields into streams and rivers.

While the water bans are temporary, they’re the starkest sign yet of the state’s long-brewing struggle with high nitrate levels in streams and rivers that supply drinking water.

“It’s a big deal: the first time ever that lawn watering has been banned,” said Tami Madsen, executive director of Central Iowa Water Works, a regional water authority serving 600,000 people.

Federal law limits nitrate levels in drinking water because of its association with infant asphyxia, also known as blue baby syndrome. And a growing body of research has found links between nitrate consumption and cancer.

While Iowa’s problems are uniquely severe, nitrate levels are a rising concern in other regions, from California to the Chesapeake Bay. And climate change is expected to worsen the problem as more intense cycles of drought and severe storms increase farm runoff.

Iowa’s concentration of fertilized row crops and massive livestock confinements that produce tons of nitrogen-rich manure have caused concerns over increased nitrate levels for years. And the state’s unique underground system of farm drainage pipes quickly pumps nitrate and other nutrients into streams and rivers.

The water system serving the Des Moines metro area has invested heavily in nitrate filtration and removal equipment. The primary facility in Des Moines, one of the largest nitrate removal systems in the world, costs $16,000 per day to operate, Madsen said.

“I’m confident in our ability to continue to provide safe drinking water,” Madsen said. “It’s just going to be at what cost.”

More frequent and extreme storms because of climate change will heighten the problems nationwide, said Rebecca Logsdon Muenich, an associate professor of biological and agricultural engineering at the University of Arkansas.

Because nitrogen travels with water, nitrate levels are especially hard to control during times of severe weather.

Muenich said farm conservation practices such as establishing wetlands and landscape buffers can help keep nitrogen out of water supplies. But the growth of the livestock industry, availability of cheap crop fertilizer and lack of regulation over nitrogen application make nitrate levels hard to control.

“We’ve kind of put ourselves in a bind unless we start investing in better technologies or more conservation,” she said.

The role of agriculture

As hundreds of thousands of residents were being asked to conserve water last month, a group of 16 experts released a years-in-the-making report analyzing the quality of the Raccoon and Des Moines rivers, the main sources of drinking water for the Des Moines region.

The researchers found that central Iowa rivers have some of the nation’s highest nitrate levels, routinely exceeding the federal drinking water standard. While some pollutants are naturally occurring, the researchers concluded that most of the nitrogen in the two rivers comes from farmland.

Commissioned in 2023 by Polk County, the state’s most populous county and home to Des Moines, the report underscored the connection between industrial agriculture and water quality.

Larry Weber, a professor of civil and environmental engineering at the University of Iowa who worked on the report, said Iowa’s problem spreads to other areas: Iowa waterways export hundreds of millions of pounds of nitrogen per year, much of it flowing into the Mississippi River and eventually the Gulf of Mexico’s dead zone.

He said water restrictions may become more common as more cities confront high nitrate levels.

“This is happening more frequently and it’s going to continue to happen more frequently,” he said.

Weber said individual farmers aren’t necessarily to blame for the crisis. They’re doing their best to survive market demands and operate within federal farm policy. But he said the broader industry and the state could do more to invest in conservation methods to prevent pollution.

He noted that Iowa lawmakers in 2023 cut $500,000 for a water quality monitoring network across the state. While the Iowa Nutrient Research Center received a short-term grant to stay open, Weber said next year it will shut down 75 sensors that measure nitrate and other pollutants in state waters.

“The agricultural system doesn’t want this unfortunately difficult information to be made available,” he said.

A spokesperson for the Iowa Farm Bureau referred questions to the state agriculture department.

In a statement to Stateline, Agriculture Secretary Mike Naig, a Republican, said many Iowa groups are working on conservation and infrastructure projects to improve water quality.

“We’re not interested in stoking animosity between rural and urban neighbors,” the statement said. “Agriculture, conservation, recreation, urban and rural development, and business growth can and must co-exist in Iowa.”

In a lengthy social media post last month, Naig said nitrate levels were primarily driven by weather and stream flows. The secretary said advances in farming practices can help farmers apply fertilizer more efficiently and touted efforts such as new wetlands and structures that reduce stream erosion. But he said the fast-growing Des Moines area also needed to examine its investments in water treatment infrastructure to meet future needs.

“The blame game is unproductive,” he wrote.

On Tuesday, Naig’s department announced a $1.9 million water quality project upstream of Des Moines. That project will install landscape buffers and bioreactors to help reduce runoff of nitrate and other nutrients. The department is contributing $244,000 of that money.

Matt McCoy, chair of the Polk County Board of Supervisors, said that local government is trying to work with landowners and farmers to prevent water pollution. The county has spent millions on projects to seed cover crops and plant vegetative buffers between fields and waterways to prevent runoff of pollutants, including nitrogen.

“I don’t think we want to disparage agriculture and farming because it’s such a big part of who we are as a state,” McCoy said.

A former Democratic state lawmaker, McCoy said the recent water restrictions and daily news reports on nitrate levels in local rivers have elevated public awareness of water quality concerns.

“There are conversations that I know are happening now that were not happening prior to the restrictions,” he said.

Citizen action

The water restrictions in Iowa sparked an influx of interest from locals in the Izaak Walton League of America’s Nitrate Watch program, which provides volunteers with nitrate test kits and maps the results from across the country.

Heather Wilson, the league’s Midwest Save Our Streams coordinator, said the nonprofit environmental organization received more than 300 inquiries from Iowans during a single week in June. For comparison, the organization received about 500 inquiries from across the nation during the first six months of the year.

While the problems in the Des Moines area are severe, she said, volunteers are recording rising nitrate levels across the state. The project gives people who can often feel helpless an active way to contribute to the understanding of nitrate pollution.

“It’s really empowering to be able to put resources in people’s hands so that they can measure the waterways that they personally care about,” she said.

Retired science teacher Birgitta Meade has been testing nitrates around her rural northeast Iowa home for years both as classroom instruction and for Nitrate Watch.

“They’re higher than I have ever tested at any prior point,” she said. “I feel like I’m meticulously documenting the death of my home and nobody else gives a rip.”

Meade said she’s considering investing in a reverse osmosis system to remove nitrates from her home’s private well. Though her nitrate levels are below the federal drinking water standard, she pointed to the growing body of research linking cancer with consumption of nitrate — even at lower levels.

Meade acknowledged the pressures facing farmers, but she said she grows frustrated every time she drives past giant storage containers full of fertilizer and other farm chemicals.

“These are people who are choosing to poison their neighbors,” she said. “And this is just untenable.”

Small towns struggle

Climate change will only intensify nitrogen pollution, said Thomas Harter, a professor and water researcher at the University of California, Davis. Last year, he worked on research that found drought and heavy rains accelerate the speed of nitrogen absorption into groundwater.

In some parts of California’s Central Valley, nearly a third of drinking and irrigation wells exceed federal nitrogen standards.

“We are ever more productive on the grower side, and that means more fertilizer being used and more fertilizer being lost to groundwater and to streams,” Harter said.

That’s particularly challenging for drinking water systems serving small population bases.

“It gets really expensive for really small systems and it’s also a lot of maintenance,” he said.

That’s a reality currently facing Pratt, Kansas, a community of about 6,500 people, where some wells have recorded nitrate levels above the federal standard.

City Manager Regina Goff said nitrate levels are pushing the community’s pursuit of a new water treatment facility that’s expected to cost upward of $45 million. The city’s proposed 2025 budget totaled about $35.7 million.

Goff said the city is exploring financing options, including potential grants. But she said it’s frustrating for the town to spend so much to meet regulatory standards for safe drinking water, which she characterized as an “unfunded mandate.”

Currently, nearly a quarter of the city’s groundwater supply is unavailable because of high nitrate levels. But the city must notify residents of high nitrate levels even in wells that are not pumping.

“It causes a panic,” Goff said. “That’s been a hard pill for us to swallow as a city — that we have to alarm our population even though we know there’s no possibility of harm.”

Editor’s note: This story has been updated to correct the name of the Izaak Walton League of America.

Stateline reporter Kevin Hardy can be reached at khardy@stateline.org.

Stateline is part of States Newsroom, a nonprofit news network supported by grants and a coalition of donors as a 501c(3) public charity. Stateline maintains editorial independence. Contact Editor Scott S. Greenberger for questions: info@stateline.org.

Anti-Line 5 graffiti at Enbridge’s pumping station in Mackinaw City, Mich. (Laina G. Stebbins | Michigan Advance)

Canadian energy company Enbridge’s Line 5 traverses an extremely sensitive ecological area across northern Wisconsin, 400 rivers and streams as well as a myriad of wetlands, in addition to a path under the Mackinac Straights between Lake Michigan and Lake Huron, all the while skirting the southern shore of Lake Superior. Such close proximity to the Great Lakes, lakes that hold over 20% of the world’s fresh surface water, lakes that supply drinking water to nearly 40 million people, yes, that does indeed make Line 5 a ticking time bomb.

Northern Wisconsin is also a very culturally sensitive area, home to the Bad River Reservation. The Bad River Band of the Lake Superior Chippewa were guaranteed rights to their lands by an 1854 treaty with the U.S. government. The easements for Line 5 across the reservation, granted to Enbridge by the Chippewa, expired in 2013 and the Bad River Band chose not to renew them. Enbridge continues to operate the line, illegally and in direct violation of the Bad River Band’s right to sovereignty over their land.

The Bad River Band has a guaranteed legal right to their land. They also have a right to Food Sovereignty, the internationally recognized right of food providers to have control over their land, seeds and water while rejecting the privatization of natural resources. Line 5 clearly impinges on the Band’s right to hunt, fish, harvest wild rice, to farm and have access to safe drinking water.

A federal court ruled that Enbridge has been trespassing on lands of the Bad River Band since 2013 and ordered the company to cease operations of Line 5 by June of 2026 (seems that immediate cessation would make more sense), but rather than shut down the aging line, Enbridge plans to build a diversion around the Bad River Reservation. They plan to move the pipeline out of the Bad River Band’s front yard into their back yard, leaving 100% of the threats to people and the environment in place.

Liquid petroleum (crude oil, natural gas and petroleum product) pipelines are big business in the U.S. With 2.6 million miles of oil and gas pipelines, the U.S. network is the largest in the world. If we continue our heavy and growing dependence on liquid fossil fuels, we must realize that we will continue to negatively impact the climate and the lives of everyone on the planet. 

Instead of moving to a just transition away from fossil fuels, liquid or otherwise, the government continues to subsidize the industry through direct payments and tax breaks, refusing to acknowledge the cost of pollution-related health problems and environmental damage, a cost which is of course, incalculable. 

There are nearly 20,000 miles of pipelines planned or currently under construction in the U.S., thus it would appear that government and private industry are in no hurry to break that addiction, much less make a just transition. While no previous administration was in any hurry to break with the fossil fuel industry, they at least gave the illusion of championing a transition to cleaner energy. 

The current administration is abundantly clear. Their strategy is having no strategy. They don’t like wind and solar and they plan to end any support for renewable energy. They don’t care if they upend global markets, banking, energy companies or certainly any efforts to help developing countries transition away from fossil fuels.

Pipelines are everywhere across the U.S., a spiderweb connecting wells, refineries, transportation and distribution centers. The vast majority of pipelines are buried and many, if not all, at some point cross streams, rivers, lakes and run over aquifers. Pipeline ruptures and other assorted failures will continue and spillage will find its way into the bodies of water they skirt around or pass under. It’s not a question if they will leak, but when.

Enbridge controls the largest network of petroleum pipelines in the Great Lakes states, and they are hardly immune to spills. Between 1999 and 2013 it was reported that Enbridge had over 1,000 spills dumping a reported 7.4 million gallons of oil.

In 2010  Enbridge’s Line 6B ruptured and contaminated the Kalamazoo River in Michigan, the largest inland oil spill in U.S. history. Over 1.2 million gallons of oil were recovered from the river between 2010 and 2014. How much went downstream or was buried in sediment, we’ll never know.

In 2024 a fault in Enbridge Line 6 caused a spill of 70 thousand gallons near Cambridge Wisconsin. And Enbridge’s most infamous pipeline, the 71-year-old Line 5 from Superior Wisconsin to Sarnia Ontario, has had 29 spills in the last 50 years, loosing over 1 million gallons of oil.

Some consider Line 5 to be a “public good” because, as Enbridge argues, shutting the line down will shut down the U.S. economy and people will not be able to afford to heat their homes — claims they have never supported with any evidence. A public good is one that everyone can use, that everyone can benefit from. A public good is not, as Enbridge apparently believes, a mechanism for corporate profit.

Line 5 is a privately owned property, existing only to generate profits for Enbridge. If it were a public good, Enbridge would certainly be giving more attention to the rights of the Bad River Band, the well-being of all the people who depend on the clean waters of the Great Lakes and to protecting the sensitive environment of northern Wisconsin and Michigan. They are not. Their trespassing, their disregard for the environment, their continuing legal efforts to protect their bottom line above all else, only points to their self-serving avarice.

The Bad River Band wants Enbridge out, and in their eyes it is not a case of “not in my back yard” they do not want Line 5 in anyone’s back yard. 

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Wisconsin’s budget committee voted unanimously Thursday to increase the bonding authority of the Safe Drinking Water Loan Program and the Clean Water Fund Program by $732 million, which could provide increased assistance to Wisconsin communities for wastewater treatment infrastructure projects.

The vote was the only unanimous decision at the Joint Finance Committee meeting, approved just after Republican lawmakers halted budget negotiations with Gov. Tony Evers Wednesday evening.

The Clean Water Fund Program provides subsidized loans for local governments to plan, design, construct and replace waste or drinking water projects. Demand for the clean water fund program exceeded available funds by almost $90 million in 2025, according to the Department of Natural Resources. 

Before the vote, JFC co-chair Sen. Howard Marklein, R-Spring Green, addressed the need for water treatment infrastructure across Wisconsin.

“I look at some of the unfunded projects around the state, and I’ve got several in my district, so this is going to be very good for a lot of our local communities when it comes to clean water,” Marklein said. 

In a Thursday statement, conservation organizations, including the Wisconsin Conservation Voters, celebrated the JFC’s unanimous decision. 

“Every Wisconsinite deserves equitable access to safe, affordable drinking water,” said Peter Burress, government affairs manager. “Increasing the revenue bonding authority of the Safe Drinking Water Loan Program and the Clean Water Fund Program is a smart, substantive way to make progress on this goal.” 

Catch up on previous bite-sized reports on the state budget here.

Wisconsin budget committee unanimously approves increasing bonding authority for water infrastructure grants is a post from Wisconsin Watch, a non-profit investigative news site covering Wisconsin since 2009. Please consider making a contribution to support our journalism.

Hydrogen has the potential to be a climate-friendly fuel since it doesn’t release carbon dioxide when used as an energy source. Currently, however, most methods for producing hydrogen involve fossil fuels, making hydrogen less of a “green” fuel over its entire life cycle.

A new process developed by MIT engineers could significantly shrink the carbon footprint associated with making hydrogen.

Last year, the team reported that they could produce hydrogen gas by combining seawater, recycled soda cans, and caffeine. The question then was whether the benchtop process could be applied at an industrial scale, and at what environmental cost.

Now, the researchers have carried out a “cradle-to-grave” life cycle assessment, taking into account every step in the process at an industrial scale. For instance, the team calculated the carbon emissions associated with acquiring and processing aluminum, reacting it with seawater to produce hydrogen, and transporting the fuel to gas stations, where drivers could tap into hydrogen tanks to power engines or fuel cell cars. They found that, from end to end, the new process could generate a fraction of the carbon emissions that is associated with conventional hydrogen production.

In a study appearing today in Cell Reports Sustainability, the team reports that for every kilogram of hydrogen produced, the process would generate 1.45 kilograms of carbon dioxide over its entire life cycle. In comparison, fossil-fuel-based processes emit 11 kilograms of carbon dioxide per kilogram of hydrogen generated.

The low-carbon footprint is on par with other proposed “green hydrogen” technologies, such as those powered by solar and wind energy.

“We’re in the ballpark of green hydrogen,” says lead author Aly Kombargi PhD ’25, who graduated this spring from MIT with a doctorate in mechanical engineering. “This work highlights aluminum’s potential as a clean energy source and offers a scalable pathway for low-emission hydrogen deployment in transportation and remote energy systems.”

The study’s MIT co-authors are Brooke Bao, Enoch Ellis, and professor of mechanical engineering Douglas Hart.

Gas bubble

Dropping an aluminum can in water won’t normally cause much of a chemical reaction. That’s because when aluminum is exposed to oxygen, it instantly forms a shield-like layer. Without this layer, aluminum exists in its pure form and can readily react when mixed with water. The reaction that occurs involves aluminum atoms that efficiently break up molecules of water, producing aluminum oxide and pure hydrogen. And it doesn’t take much of the metal to bubble up a significant amount of the gas.

“One of the main benefits of using aluminum is the energy density per unit volume,” Kombargi says. “With a very small amount of aluminum fuel, you can conceivably supply much of the power for a hydrogen-fueled vehicle.”

Last year, he and Hart developed a recipe for aluminum-based hydrogen production. They found they could puncture aluminum’s natural shield by treating it with a small amount of gallium-indium, which is a rare-metal alloy that effectively scrubs aluminum into its pure form. The researchers then mixed pellets of pure aluminum with seawater and observed that the reaction produced pure hydrogen. What’s more, the salt in the water helped to precipitate gallium-indium, which the team could subsequently recover and reuse to generate more hydrogen, in a cost-saving, sustainable cycle.

“We were explaining the science of this process in conferences, and the questions we would get were, ‘How much does this cost?’ and, ‘What’s its carbon footprint?’” Kombargi says. “So we wanted to look at the process in a comprehensive way.”

A sustainable cycle

For their new study, Kombargi and his colleagues carried out a life cycle assessment to estimate the environmental impact of aluminum-based hydrogen production, at every step of the process, from sourcing the aluminum to transporting the hydrogen after production. They set out to calculate the amount of carbon associated with generating 1 kilogram of hydrogen — an amount that they chose as a practical, consumer-level illustration.

“With a hydrogen fuel cell car using 1 kilogram of hydrogen, you can go between 60 to 100 kilometers, depending on the efficiency of the fuel cell,” Kombargi notes.

They performed the analysis using Earthster — an online life cycle assessment tool that draws data from a large repository of products and processes and their associated carbon emissions. The team considered a number of scenarios to produce hydrogen using aluminum, from starting with “primary” aluminum mined from the Earth, versus “secondary” aluminum that is recycled from soda cans and other products, and using various methods to transport the aluminum and hydrogen.

After running life cycle assessments for about a dozen scenarios, the team identified one scenario with the lowest carbon footprint. This scenario centers on recycled aluminum — a source that saves a significant amount of emissions compared with mining aluminum — and seawater — a natural resource that also saves money by recovering gallium-indium. They found that this scenario, from start to finish, would generate about 1.45 kilograms of carbon dioxide for every kilogram of hydrogen produced. The cost of the fuel produced, they calculated, would be about $9 per kilogram, which is comparable to the price of hydrogen that would be generated with other green technologies such as wind and solar energy.

The researchers envision that if the low-carbon process were ramped up to a commercial scale, it would look something like this: The production chain would start with scrap aluminum sourced from a recycling center. The aluminum would be shredded into pellets and treated with gallium-indium. Then, drivers could transport the pretreated pellets as aluminum “fuel,” rather than directly transporting hydrogen, which is potentially volatile. The pellets would be transported to a fuel station that ideally would be situated near a source of seawater, which could then be mixed with the aluminum, on demand, to produce hydrogen. A consumer could then directly pump the gas into a car with either an internal combustion engine or a fuel cell.

The entire process does produce an aluminum-based byproduct, boehmite, which is a mineral that is commonly used in fabricating semiconductors, electronic elements, and a number of industrial products. Kombargi says that if this byproduct were recovered after hydrogen production, it could be sold to manufacturers, further bringing down the cost of the process as a whole.

“There are a lot of things to consider,” Kombargi says. “But the process works, which is the most exciting part. And we show that it can be environmentally sustainable.”

The group is continuing to develop the process. They recently designed a small reactor, about the size of a water bottle, that takes in aluminum pellets and seawater to generate hydrogen, enough to power an electric bike for several hours. They previously demonstrated that the process can produce enough hydrogen to fuel a small car. The team is also exploring underwater applications, and are designing a hydrogen reactor that would take in surrounding seawater to power a small boat or underwater vehicle.

This research was supported, in part, by the MIT Portugal Program.

© Credit: Courtesy of the researchers

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