By Nina B. Elkadi for Sentient.
Broadcast version by Joe Ulery for Indiana News Service reporting for the Sentient-Public News Service Collaboration

Approximately 122 million people are exposed to potentially toxic byproducts in their drinking water. The possibly toxic mix is the result of organic material, like manure, interacting with disinfectants in the treatment process. According to a new report by the environmental non-profit Environmental Working Group, when the manure and other organic materials interact with chlorine, the result is a chemical byproduct that raises a number of health risks, including some that may have long-lasting health consequences for consumers.

“It’s not just that there’s manure in your water and that’s unsafe, but it’s that manure and other organic materials are then triggering these unsafe contaminants,” Environmental Working Group Midwest Director Anne Schechinger tells Sentient.

The 1.7 billion animals raised for consumption in the United States produce approximately 941 billion pounds of manure each year. Smaller water systems and residents living on private wells are especially vulnerable to agricultural pollution, but this new report raises another concern. The problem with disinfection byproducts — of specific concern in this report are trihalomethanes (TTHMs) — reaches cities including New York City and Los Angeles, which each had at least one test above the maximum contaminant level (MCL) set by the Environmental Protection Agency in the last five years.

From 2019 to 2023, the five years this report covers, the Washington Suburban Sanitary Commission (that serves the Washington D.C. suburb in Maryland) tested above the MCL level 218 times. TTHMs can form when chlorine interacts with a host of organic matter ranging from dead vegetation to, as this report states, manure.

In a 2021 notice the EPA drafted for water utilities to notify residents that they have high levels of TTHMs in their water, the regulators wrote: “Some people who drink water containing trihalomethane in excess of the MCL over many years may experience problems with their liver, kidneys, or central nervous system, and may have an increased risk of getting cancer.” Four years later, the regulatory landscape looks very different — the EPA is moving to dismantle Clean Water Act protections and the phrase “Safe Drinking Water” is banned at the Department of Agriculture.

The new report from EWG states that six of the 10 systems that tested at or above the maximum containment level at least once “are also listed among the states with the most livestock.” EWG cites research that documents how runoff from animal farms, and swine farms in particular, can contain extremely high levels of precursors that can turn into harmful chemicals during the disinfection process. Dairies are a major culprit too.

As cities grapple with multiple hot-button water issues from per- and polyfluoroalkyl substances (PFAS) to nitrate, the list of things to filter out seems to be continuing to grow. Water experts say disinfection byproducts like TTHMs could be filtered out with new technology targeting PFAS, if that regulation sticks.

‘Clean’ Water?

“What unknown things that we don’t yet know are in our drinking water” are the “bread and butter” of Susan Richardson’s lab. Richardson is a professor of Chemistry and Biochemistry at the University of South Carolina, where she has been studying disinfection byproduct chemicals for around 30 years.

When we treat water, Richardson says, we’re killing harmful microbes. “But the problem is that the disinfection byproducts are an unintended consequence of trying to kill harmful pathogens,” she says.

Richardson says the interaction between the disinfectants and natural organic matter like manure can result in disinfection byproducts — as do tea leaves, algae and many other things produced in nature.

In 2024, the Biden Administration’s Environmental Protection Agency passed a new regulation to address PFAS, requiring public utilities to comply with new maximum contaminant levels in treated water.

Richardson’s opinion is that the regulatory approach to PFAS was rushed, and yet the outcome could have a silver lining. As utilities look to install new systems to filter out the PFAS, the systems can include filters that remove other contaminants too.

Certain filters, like granular activated carbon filters, can take out the precursor chemicals that lead to disinfection byproducts like TTHMs. They aren’t cheap. Richardson lives in Columbia, South Carolina, where the water plant serves around 375,000 customers. Installing that type of filtration system would cost the city approximately $200 million — not to mention approximately $24 million per year on upkeep.

In 2024, the EPA announced $1 billion in funding for communities and people on private wells impacted by PFAS contamination. Cities like Columbia plan to use this to partially fund their projects, if the funding remains.

A Defunded Landscape

The EWG report recommends starting to fix the problem at the source, in this case, they argue, on the farm. But under the Trump administration, funding for on-the-farm conservation practices aimed to reduce pollution in waterways is currently paused.

“When you take away hundreds of millions of dollars from cover crops and stream buffers and filter strips, you’re also taking away a reduction in nitrate and manure and other contaminants running off farm fields,” Schechinger says.

The Trump administration has not publicly commented on the future of PFAS, but just a few days ago, an anonymous EPA employee told the Guardian that the agency is considering a more lax approach to regulating chemicals such as PFAS.

“I think we have good water,” Richardson says, holding up her water bottle. “I’m drinking it. But, I think we can do better. I know we can do better, and I want us to do better.”


Nina B. Elkadi wrote this article for Sentient.


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A critical decision now rests with Gov. Ron DeSantis, as Florida coastal communities and shellfish farmers urge him to sign a bill permanently banning oil drilling near the Apalachicola River. They see the river as a lifeline for the state's aquaculture industry - and a fragile ecosystem.

House Bill 1143, which passed the Legislature with a single "no" vote in the Senate, would block drilling within 10 miles of the Apalachicola National Estuarine Research Reserve.

Adrianne Johnson, executive director of the Florida Shellfish Aquaculture Association, warned that the region's economy and environment hang in the balance.

"That area is really unique; 75% of our oyster farmers operate across Franklin, Wakulla and Gulf counties, so those three counties that are downriver from the proposed oil drilling site," she said. "So, protecting that water is absolutely critical to the livelihood of our farmers."

Despite a court win stopping one drilling project in Calhoun County, she said unprotected sites still threaten Apalachicola's fragile recovery. Aquaculture in the area sustains an oyster industry that once supplied 90% of Florida's wild harvest before its collapse.

The Apalachicola River watershed supports Florida's emerging shellfish industry, which filters water, creates habitats and sustains rural coastal economies. Johnson said even the threat of oil contamination, such as what happened during the 2010 BP spill, could devastate the region.

"We are confident that the governor is supportive of our rural coastal communities," she said. "Under his governorship, the state has invested millions of dollars into restoring Apalachicola Bay. So really, this bill aligns with those values."

Under Florida's "7-Day Rule," DeSantis must decide on the Apalachicola drilling ban by next Wednesday. The bill automatically becomes law if he chooses not to either sign or veto it.


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June is World Oceans Month, and advocates are warning that industrial shipping pollution hurts both oceans and port communities.

At least 31 million people live within three miles of a port, according to the Environmental Protection Agency. That includes thousands of New Jerseyans. Industrial shipping frequently relies on heavy fuel oil, which releases carbon dioxide, sulfur oxides and black carbon into the atmosphere, causing harm to marine ecosystems and port communities.

Altorice Frazier, northeast port campaigner with Pacific Environment, said if the global shipping industry was its own country, it would be one of the largest polluters in the world.

"Global shipping burns some of the dirtiest fossil fuels, like heavy oil, producing toxic air pollutions and greenhouse gases," he explained.

Those toxic pollutants often affect the communities closest to ports, frequently working-class neighborhoods made up primarily of people of color. Shipping pollution causes $265,000 premature deaths and six million childhood asthma cases globally each year, according to the Ocean Conservancy.

One way to cut down on port pollution, Frazier said, is the electrification of cargo ships. Much like electric cars, cargo ships can be electrically powered and charged while at a port. He explained this would cut down on emissions, the acidification of marine ecosystems and the negative health effects on port communities.

"We really want to show where there's funding, there's possible job opportunities," Frazier continued. "There's a gain in this. It might not be in the short term, but in the long term, there is definitely opportunity. And we want to see industry and port authorities work alongside communities and government to really strategize how this is possible."

Frazier added shore power can create jobs and sustain economic growth for communities, while cutting down on pollution and noise.

Forest fires have broken out in parts of New Mexico that state forecasters had already warned would see an elevated wildfire risk this summer due to high temperatures, low snowpack and ongoing drought. At least 25 New Mexico jurisdictions imposed some level of fire restriction this spring.

State Forester Laura McCarthy said the peak of fire season is still a week away, beginning June 26.

"Right after the Solstice, so the days are at their longest, which means the burn periods are at their longest and typically the highest temperatures we experience all summer are in the last two to three weeks of June," she continued.

On Tuesday, New Mexico Gov. Michelle Lujan Grisham declared a state of emergency in response to the Trout Fire, which is burning in the Gila National Forest, forcing residents to evacuate. The Buck Fire also has burned more than 57,000 acres in the same area of Southwest New Mexico. The governor has urged localities to ban fireworks and restrict water usage.

McCarthy reminded people that dry conditions can cause a small fire to spread in a split second - whether it's from a backyard grill, a spark caused by welding, or a campfire that appears to be out but is reignited when hidden embers are stirred up by the wind, catching surrounding vegetation on fire. She said there's no "go back" - even if a fire is accidental.

"If you look at every single big fire we've had, there was either a lightning strike or a person behind it,"
she added. "Yes, there is arson, but the majority of human-caused fires are not arson. They are caused by unintentional response and then, it's just too late."

Just three years ago, New Mexico's Hermit's Peak/Calf Canyon fire exploded into the state's most destructive wildfire ever. State lawmakers passed billss in this year's session to address the issue. One establishes a program for wildfire prevention and mitigation, while the other allows for ignition-resistant construction.


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