By Nina B. Elkadi for Sentient.
Broadcast version by Mark Moran for Iowa News Service reporting for the Sentient-Public News Service Collaboration

On March 10, the Iowa Department of Natural Resources received two phone calls. One caller phoned to complain that manure runoff was entering a tributary of Dry Run Creek, a waterway that provides vital habitat for fish and other wildlife in Winneshiek County, Iowa. The other caller described dead fish downstream. A few days later on March 13, the DNR reported the manure spill but did not name its source. Sentient has now obtained records from the Iowa DNR that show the source is an Iowa dairy operation — the Dale Humpal Dairy — located near an animal feeding operation run by another individual — Darryl Humpal — whose own operation has been fined multiple times for manure spill violations. Both operations have each received approximately $2 million in federal subsidies. 

This particular manure spill caused a 10.2 mile-long fish-kill — one of the largest documented kills to occur in Iowa in the last decade. 

In the Department’s field report, DNR officials observed “several dead fish” and “a strong odor of manure.” The report continues, “fish appeared to have recently died and they had not deteriorated yet.” In a letter to a DNR district supervisor, a natural resource technician describes, “freshly dead fish with some stranded gasping for air, manure on top of ice, and dirty flowing water below ice…”

More than 100,000 dead fish were observed by the investigators, whose subsequent water tests revealed lethal levels of ammonia. According to an evaluation of Dale Humpal Dairy’s manure storage facility on March 12, a faulty manure control structure had been “noted during previous inspections.” 

Lactating dairy cows produce 150 pounds of manure per day. Dairy operations produce a lot of manure — more than poultry farms or beef — and that manure can wreak havoc on the environment in a number of ways. In addition to water pollution, livestock manure management is responsible for around 9 percent of methane emissions in the U.S., according to the Environmental Protection Agency.

As part of its investigation, on March 11 DNR officials paid a visit to Dale Humpal Dairy, where the manure appeared to be originating. Dale Humpal, the apparent operator who is listed as a member of the Iowa State Dairy Association Board, was nowhere to be found that day.

According to DNR documentation, Dale Humpal Dairy is a 330-head dairy with 50-60 heifers, and 15 calves “in huts,” the small structures where individual calves are typically kept on industrial dairy operations. The documents refer to the dairy as an animal feeding operation, which the EPA defines as an agricultural operation where animals are raised in confinement. In one of the photos Sentient obtained, cows can be seen crammed in a large shed with just enough room at the bottom to poke their heads out for air.

On March 12, the DNR was able to make contact with Humpal, who told the DNR he was not aware of any manure overflowing from his operation. As the DNR official continued to test for ammonia downstream (with some samples testing as high as 23 parts per million), they ultimately came to their conclusion that the dairy was the source, and on March 31 called Humpal with the results.

“I stated to him that my investigation was concluded and it was determined that the runoff from his open lots caused manure to flow into the tile intake,” the official wrote, referring to the soil drainage system prevalent in Iowa farmland.

In 2017, a manure spill attributed to the animal feeding operation owned by Darryl Humpal — located near Dale Humpal Dairy — killed 34,486 fish in Dry Run Creek.

Water pollution continues to afflict Iowa amid a steady increase of farm animals in the state. The overwhelming majority — 99 percent — of farmed animals in the U.S. are raised in factory farms. In Iowa, there are almost 124 million farm animals at any given time — around 55 million chickens, 53.4 million hogs, 11.5 million turkeys, and 3.7 million cattle and cows. In Iowa, manure spills are commonplace: a recent report by Food and Water Watch found that from 2013 to 2023, there were 179 documented manure spills that killed almost 2 million fish.

Dale Humpal did not immediately respond to a request for comment. The Iowa Department of Natural Resources did not respond regarding what penalties it will be pursuing as a result of the violations.


Nina B. Elkadi wrote this article for Sentient.


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Environmental advocates are urging Washington state lawmakers to require cargo ships to plug in while in port.

The Port of Seattle will require all cruise ships to use shore power by 2027, but cargo ships face no such requirement. One ship idling for 40 hours emits 30 tons of carbon dioxide and sends 22 pounds of toxic soot into the air, which can harm port workers and adjacent neighborhoods.

Teresa Bui, climate policy director for the group Pacific Environment, said the sheer volume at regional ports requires action.

"The Northwest Seaport Alliance saw visits from 1,700 cargo vessels in 2023," Bui pointed out. "While the port is vital to the state economy, there is both a climate and a public health imperative to transition away from diesel and require these ships to plug in."

A 2023 study found diesel exhaust contributes more than 80% of the cancer risk from toxic air pollutants in the Seattle-Tacoma area.

Legislation to require shore power was introduced in the state House in January but did not make it out of committee. The legislation would apply to any terminal with more than 20 vessel visits per year. State lawmakers have committed more than $50 million toward port electrification.

With the third-largest container ship complex on the West Coast, Bui anticipates strong job creation.

"The additional benefit of requiring ships to plug in is there's job growth potential," Bui emphasized. "The TOTE terminal created 55 local jobs. IBEW supported this measure when it was introduced in the legislature."

A Maritime Administration estimate anticipates 100% shore power at the Port of Seattle would create hundreds of jobs over 30 years.

Environmental and wildlife conservation in Montana took hits during this year's state legislative session, including vetoes from the governor on bills that received bipartisan support.

Among bills Gov. Greg Gianforte vetoed was House Bill 477, which would have phased out some single-use Styrofoam food containers in favor of those made from Montana agricultural byproducts.

The bill's sponsor, Rep. Marilyn Marler, D-Missoula, called it "discouraging" when such a bipartisan effort is vetoed.

"Because it seems to me he did not listen to a wide variety of people, even in his own party," she said. "I think that with this particular bill, it just didn't send the right message about what our values are."

Tourism and recreation are important and growing industries in the state, and as Marler put it, "People don't come here to see trash."

Constituents can see how their lawmakers voted on conservation this session on the Montana Conservation Voters 2025 legislative scorecard.

Marler also voiced concern about weakening the Montana Environmental Policy Act, which was designed to uphold Montanans' constitutional right to a clean environment. While there was a win for habitat funding, Marler added she is seeing continued privatization of wildlife.

"It was not a great session for conservation and it was not a great session for Montana hunters," she explained. "It is becoming very hard to keep commercialization of wildlife off the books."

In renewable energy news, Gianforte vetoed the Montana Solar Shares Act, which would allow Montanans to buy shares in an energy-generating solar array. But a veto override poll for lawmakers is currently underway by mail.


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Conservationists are celebrating the protection of five miles of river frontage along the White Salmon River. The 174-acre site was purchased by The Conservation Fund more than a decade after the removal of Condit Dam. The dam was breached in 2011, draining the former Northwestern Lake. The lakebed makes up much of the acquisition.

Gates Watson, vice president of The Conservation Fund, said the removal restored a 44-mile free-flowing river.

"The dam's presence had an impact on the migration route for fish, including regional salmon populations, and disrupted Yakama Nation's right to fish and gather and hunt along this land, and with this transition that will be restored," he explained.

The land was purchased from PacifiCorp, which operated the hydroelectric dam. The site is located in the ancestral territory of the Yakama Nation. The acquisition will be managed by The Conservation Fund temporarily, before being acquired by Yakama Nation on a permanent basis.

Planning for the long-term restoration brought together PacifiCorp, Yakama Nation, The Conservation Fund and an owners association whose cabins sat near the shores of Northwestern Lake. Cabin owners had been leasing land from PacifiCorp. Site surveys were conducted to establish individual lots so owners could acquire the land under their buildings.

Watson said site planning also included a conservation easement and more.

"The vision for the completed White Salmon Corridor project is five miles of connected riparian habitat and a foot trail along the White Salmon River that is owned and managed by Yakima Nation, restoring opportunities for tribal members to access the river and fish," he continued.

The river is a breeding habitat for steelhead, Chinook and coho salmon, and researchers have found juvenile fish are returning in strong numbers.