How Your Diet Contributes to Water Pollution
From Vermont's Lake Champlain to rivers and oceans across the nation, our waterways are being overloaded with pollution running straight from our farms. What's at risk? Everything from clean drinking water and safe seafood to refreshing swimming holes.
Summer homes line Lake Champlain in Addison County, Vermont. For every square mile of lake, 18 square miles of land drain into it. Much of it is forested and about 20% is farmland, in particular dairy. The area's farms contribute the lion's share of the phosphorus that ends up in the lake each year. Excess phosphorus leads to algae blooms, a big problem for anyone hoping to enjoy the lake.Photo credit: Flirite Aviation LLC
If you were to go looking for a magnificent American body of water worthy of an epic end-to-end swim, Lake Champlain might be it. Carved out of high country by glaciers, fed by Green Mountain brooks and icy Adirondack springs, it stretches 120 miles, forming much of the border between New York and Vermont. It provides drinking water for 145,000 people. But in 2004, when clean-water activist Christopher Swain swam the full length, he was immediately confronted by the truth: Lake Champlain was anything but pristine. "I swam through clouds of manure runoff that were kind of slippery and sticky at the same time," Swain recalls. "I could smell the fertilizer, when it was pouring down rain. There was this lawn-and-garden chemically smell." In the northern reaches of the lake, he swam through blue-green algae. In the south, he encountered invasive aquatic weeds that entangled him. At another point, he felt a tingling on his leg, "like a cellphone buzzing in my pocket." It turned out to be a sea lamprey, an eel-like, parasitic fish, trying to suck his blood.
The stink, the animal feces, the algae blooms, even the lamprey were all "things that didn't belong here but now had the run of the place," Swain says. Many could be linked to nutrients that leach from farms upstream and fertilizers flowing from fields and lawns, making their way into streams and eventually the lake. This persistent ooze of waste has been steadily rising over the last century, changing the lake's ecology and stimulating the growth of blue-green algae, which can prove fatal to dogs and toxic to humans. Beach closures have become an annual summer event in part due to the toxic algae, setting up a conflict between those like Swain who prize Champlain for its recreational opportunities and those who make a living by growing food in the watershed.
Legislating Better Water
In today's political climate, it might be hard to believe that at one time the country was nearly unified in the fight for clean water. In 1972, Congress overrode President Nixon's veto and passed what is commonly called the Clean Water Act, one of the country's most significant environmental laws, which continues to shape water quality to this day. Ohio's Cuyahoga River no longer catches fire from dumped petrochemicals (the 1969 fire became a symbol that helped launch the environmental movement). A corporation can no longer dump oil in the ocean and walk away scot-free. The billions BP paid to settle claims from the 2010 Gulf spill are a direct result of the Clean Water Act's provisions. That's because the Clean Water Act subjected polluters that directly discharge waste into America's waterways to permitting, fines and potential lawsuits if they fail to comply with regulations. These were designated as "point source" polluters, because the sewer pipe, or wastewater plant, could be easily identified as the source.
But the act also defined "nonpoint source" pollution, which arises from diffuse sources, such as irrigation ditches that carry fertilizer into rivers, or dry streambeds that can channel cow manure into rivers after a heavy storm. Significantly, agriculture won an exemption under the Clean Water Act, which meant that nonpoint pollution from agricultural sources could continue unchecked. Attempts to limit or more precisely define this exemption are often framed as an attack on farmers by bureaucratic regulators and environmentalists. So progress in cleaning up water often stalls and conflict persists.
But Vermont, in its typically iconoclastic way, has tried to bridge the opposing camps. Starting a few years before Christopher Swain was stroking across Champlain's murky surface, state regulators sought common ground to take action and restore the lake. The resulting water-protection rules have been exemplary. If the Trump administration succeeds at rolling back federal water regulations, Vermont and Lake Champlain may well serve as an example for other states that want to clean up their local waters while keeping farmers solvent.
Each of the roughly 129,000 adult dairy cows in Vermont creates about 120 pounds of manure a day. For farmers, whether they run an organic farm like Guy Choiniere's in Highgate Center or a conventional one, managing manure is a big part of the job.
Upstream on the Farm
Guy Choiniere is a third-generation Vermont dairy farmer based in the village of Highgate Center. His operation, which is certified organic, sits on 450 acres of rolling land that today is an incarnation of the well-managed farm. Grasses of a half dozen varieties flutter in the light breezes, 100 healthy cows loll in the fields and rest peacefully in the loafing barns, and a robust buffer of woods and shrubs guides the eye down to the Rock River, which meanders to nearby Lake Champlain. But 15 years ago, Choiniere's farm was an exposed swath of mud and manure-just the sort of farm that would be a source of nonpoint water pollution and a direct threat to Vermont's great lake.
"There wasn't a blade of grass on those riverbanks," Choiniere comments as he ambles over clover and vetch. "The cows were destroying it. There were landslides every other year. Conservation is about keeping your soil and your minerals on your own farm. And that's exactly what I wasn't doing. I attracted attention long before these rules were mandated"-because of fertilizers and manure he routinely spread on his fields that leached into the Rock River.
Guy Choiniere's farm shows how agricultural pollution built up not just over years but centuries. Choiniere is of Quebecois heritage and his French predecessors were the first white men to colonize the valley after Samuel de Champlain "found" it in 1609. The farm, like the rest of the Champlain Valley, had been covered in forest, which the settlers cleared, starting the first big pulse of pollution into the lake.
Cleared trees and dairy cows, however, weren't the only source of the lake's rising levels of nutrient pollution. An even more potent vector arose by the time Choiniere's father carved out his farm from the family land: "My dad took over in the '60s and that's when corn took over," Choiniere explains. His father followed conventional advice to rely on feed and reduce the time cows spent on pasture eating grass, with the goal of pumping more milk from the cows. "As cows' genetics improved we were milking heavier so we had to satisfy their energy needs," Choiniere says. "And corn became a nice energy source. Cows love it."
But corn-with all the fertilizers and pesticides it takes to produce-is an exceptional burden on waterways. Unlike pasture, which keeps ground covered in grass year-round and the soil intact, corn requires plowing and added nutrients to pump up yields. To supplement soil with nitrogen and phosphorus, farmers spread cow manure, never in short supply on a dairy farm, as well as chemical fertilizer on their plowed fields. Through the winter snow and spring rains, fields are kept bare-meaning that the exposed soil can wash away. Besides adding sediment to the watershed, the soil has phosphorus bound up in it, adding to the nutrient load. Until the early 2000s, most Vermont corn was grown this way. Even though their goal was to fertilize corn, farmers were inadvertently overfertilizing Lake Champlain.
Corn grown near water can inadvertently "fertilize" the rivers and streams with phosphorus and manure runoff. See more of America's food and waters with our interactive map (see below).
At Water Level
Phosphorus and nitrogen stimulate plant growth, which is why farmers spread them on their fields. But when rains wash fertilizers and manure into streams and lakes, these nutrients feed microscopic algae. During warm weather, they proliferate at a tremendous rate in "algae blooms."
They're an eyesore, turning lakes bright green and portions of ocean, such as the Gulf of Mexico, red. These algae consist of multiple species, some harmful, others benign. They foul shorelines, lakes and rivers. Particularly worrisome is blue-green algae, which is technically a bacteria known as cyanobacteria. These microorganisms can produce toxins that kill fish, mammals and birds. Across the country, dogs have died after swimming in lakes and rivers choked with blue-green algae. People have also been sickened, because under certain conditions, the algae emit toxins that can cause rashes, respiratory symptoms, diarrhea and intestinal pain, and with long-term exposure, may harm the liver and digestive system.
Preliminary research at Dartmouth College has linked cyanobacteria toxins to ALS (Lou Gehrig's disease). Researchers mapped higher-density clusters of people with ALS across northern New England near lakes with the lowest water quality that are likely to have harmful algae blooms. The researchers suspect that toxic algae blooms may play a causal role in clusters of the neurodegenerative disorder. But they warn against overreacting, saying that swimming in fouled water once won't cause the disease. If there is a connection between ALS and cyanobacteria it likely involves long-term exposure to cyanobacteria, as well as a genetic predisposition to the disease and other environmental or chemical triggers.
Though this research sounds scary, it is not conclusive at this point, and many other potential factors could have caused the ALS clusters. "We agree that there should be rigorous research into that devastating disease, but this hypothesis about a linkage with a particular amino acid in cyanobacteria is not supported," says Vermont state toxicologist Sarah Vose, Ph.D.
Although Vermont authorities say there are no records of serious human health effects from blue-green algae on Lake Champlain, beach closures occur every summer, impacting the $300 million in annual recreational revenue from vacationing families, watersports enthusiasts and fishermen. Cyanobacteria isn't the only culprit: E. coli from livestock, pets and untreated sewage can foul the lake too. By the early 2000s, beach closures were common-between 2012 and 2014, there were more than 60 closures.
Algae-both toxic and nontoxic species-are harmful in other ways too. In warm weather, the blooms shade out more benign aquatic plant life. Once the algae die off in winter, waterborne bacteria gobble them up and multiply, consuming oxygen from the water and choking fish and other species. By springtime, a pond suffering from nonpoint source pollution and algae blooms may be effectively dead. Were this just occurring in Lake Champlain, the concerns would perhaps not travel further than the state legislature. But the blooms occur in nearly every state, peaking in August and September, though no national agency tracks them-or the illnesses they cause.
The Gulf of Mexico's oxygen-poor "dead zone," for example, comes like clockwork each summer as nutrients flow from the heartland and out the mouth of the Mississippi River into the Gulf. This feeds the Karenia brevis algae that cause "red tide." State agencies closely monitor red tide, closing shellfish beds and limiting fishing to ensure contaminated seafood doesn't make it to consumers. The states surrounding the Chesapeake Bay have tried, for decades, to address nonpoint pollution and algae blooms, but annually receive failing marks on water quality, much to the chagrin of seafood lovers. In the Midwest, favorite summer lake-recreation spots suffer because visitors can't enjoy waters fouled with blue-green algae.
And then there's drinking water. In 2014, the city of Toledo shut down its water supply, forcing it to truck in bottled water, because of blue-green algae that engulfed the western end of Lake Erie. (Vermont, New York and Quebec have been mostly successful at treating the 20 million gallons of water that's drawn from Lake Champlain each day for algae and other pollutants.)
Des Moines, Iowa, faces a related crisis, spending millions of dollars each summer so its water utility can clear drinking water of nitrates, which arise from fertilizer runoff and can be especially harmful to infants and small children. "Look at the culverts discharging [agricultural runoff] into the Raccoon River"-the main source of drinking water for 500,000 people, says Des Moines Water Works utility manager Bill Stowe. "They have the exact same configuration as if they were coming out of a city storm-sewer system. But thanks to our friends at EPA, agriculture has an exemption for stormwater discharge under the Clean Water Act." The utility sued three northern Iowa counties to block upstream agricultural pollutants, but a federal judge dismissed the closely watched suit in March 2017. The judge said it was up to the Iowa state legislature to act.
Suing to Save Our Waters
Guy Choiniere would never say that the Clean Water Act or any regulation caused him to completely rethink his way of farming. Like most good farmers, he senses, almost preternaturally, what his land needs. As the Clean Water Act's co-drafter Thomas Jorling notes, "Farmers tend to be much more knowledgeable about natural systems than people who've gotten a Ph.D."
But the aspirations of the Clean Water Act and the failsafe devices baked into the legislation made a radical change economically feasible in a state like Vermont-even when it involved rethinking agriculture. Jorling, then a Senate staffer, and the other drafters of the act recognized that "government agencies have a tendency to become paralyzed by complexity or funding." So they wrote the Clean Water Act in such a way that there was no legal wiggle room if water quality fell below an acceptable threshold. In other words, if the powers that be are not doing their job to keep the water clean, the act allows them to be sued. The "civil suits" provision in the act gave the people of New England legal recourse when the water in Lake Champlain became unacceptable. Which is exactly what happened.
In 2002, the state of Vermont proposed phosphorus limits for the lake to comply with the Clean Water Act, setting a "Total Maximum Daily Load" (TMDL) that marks a threshold for the maximum amount of pollutants that a body of water can handle each day. But the evolving science on the matter convinced the nonprofit Conservation Law Foundation that these limits were insufficient to stop the algae blooms and protect the ecology of the lake. So in 2008, the foundation sued the EPA, arguing that the Feds needed to step in, revise Vermont's limits and fund measures to reduce the flow of nutrients into the lake. The EPA and the state eventually agreed to set a lower TMDL for the lake, which was issued in 2016.
Since the bulk of the lake nutrients arise from farms, the state realized it had to focus on that source. Luckily federal conservation grants are available to farmers, paying for water-protecting measures, such as streamside vegetation buffers. These USDA grants, which increased from 2002 through 2014, can amount to hundreds of thousands of dollars for even small farmers. Funded every five years under the massive Farm Bill, they have a good chance of surviving in the Trump era because of support by Republican lawmakers in Congress. The money, after all, flows to farm-state constituents.
In Vermont, federal programs work in tandem with the state's water-cleaning Act 64. Passed in 2015, the law requires all farms to start using specific farming techniques to reduce runoff by July 2017. Even farms with fewer than 50 animals must use practices like manure injection, underground catchments for stormwater runoff and extension of streamside forested buffers-all measures that are designed to protect the watershed and can often be funded under federal farm programs.
Hope for the Future
The impact of well-placed farming subsidies and water-quality management laws are now evident on many farms in Vermont. At Lorenzo Whitcomb's conventional dairy farm just outside of Burlington, he sows winter rye as a cover crop over his harvested cornfield. In just 10 years, cover crops in Vermont have gone from 50 to 25,000 acres. On the southern end of the lake in Orwell, where 24-year-old Rachel Orr has taken over from her father to run their 200-cow dairy farm, the young farmer produces a dictionary-thick "nutrient management plan" that pinpoints her soil types down to the square foot and indicates precisely the amount of fertilizer that needs to be applied. All of these different efforts were co-funded by federal and state matching grants.
But most impressive is Guy Choiniere's organic farm. When farm inspectors first started snooping around his property in the late 1990s, he admitted it was hard to take. "Someone coming onto your farm and telling you you've got problems is very insulting," Choiniere recalls, echoing a common complaint of farmers. "We had to get over that." Ten years later, strolling through his pastures, it is clear he is very much over it. Beneath his barn, catchments slow drain water and cause it to percolate slowly through the soil, filtering out nutrients. Up ahead is a cow path that had previously been a mudslide but has been reworked as a tidy, erosion-proof stone lane. And leading down to the river itself is a lush forest planted with the most efficient trees for absorbing nutrients before they can hit the river and fertilize an algae bloom. All this was partially financed by an active federal and state government grant program, including $250,000 from the USDA's Natural Resources Conservation Service. Choiniere chipped in around half of the bill for the improvements-eager to grow his business and lighten his farm's footprint.
Eventually Choiniere took a leap of faith and went a step further than the government required. He went organic and planted his cornfields back into native pasture. Since pasture is never tilled, it holds the soil and nutrients better than an annual crop like corn. And there are other benefits. His vet bills have plummeted now that his animals are 100 percent grass-fed. The price he earns from his milk has risen 15 percent and he spends nothing on tilling. "Being sustainable is money in my pocket," he says, as he looks out over his lush fields. "That's the name of the game for staying in business. Agribusiness will give you recommendations all day long. How much fertilizer to use. How much grain to feed... Me, I went with my instincts."
In other words, in a bid for water quality, measures were put in place that ultimately improved farming and, in Choiniere's case, profitability. But even farmers who have not gone organic or reverted to pasture have taken basic but effective steps. And those successful in controlling their nonpoint pollution have seen profits rise, says Ryan Patch, ag development coordinator for Vermont's Agency of Agriculture, Food and Markets. He oversaw many of the state's listening sessions with farmers leading up to Act 64 and recalled a number of "aha" moments when farmers would suddenly exclaim, after a nutrient-management training course, "You just saved me $10,000 in fertilizer!" Savings arose because nutrients were applied more judiciously and kept on the farm instead of washing into Lake Champlain.
Of course not everybody in the agricultural community is on board. Plans to reduce nutrient runoff hit roadblocks last year, when farmers sought more time to implement the kind of measures that Choiniere champions. Across-the-board change, it seems, won't come easily.
Nor will it come fast. Although some streams running into the lake show marked improvement, others continue to exceed their nutrient limits. And portions of the lake remain far above target levels for phosphorus, meaning a continued pattern of toxic algae blooms, summer beach closures and dead zones for aquatic life. But Patch, for one, takes a long view. "I am optimistic about the road map we've laid out," he says, speaking of the state's plans. "We'll do it with the help of the farms." He also notes that the lake is dealing with centuries of human impacts-all the latent pollution from logging, erosion and residential development-that "won't be able to be addressed until we shut the faucet off" from all the farms upstream. Patch and other officials estimate that it will take 20 years to close the tap for good, and once that's done, they can begin to reduce the residual nutrients in the lake.
Will the rest of the country, facing similar water-quality crises, follow suit? In these tumultuous times, with environmental regulations under siege from the White House, the paths that individual states and the federal government take on water quality may diverge. Vermont, as its most famous poet, Robert Frost, once wrote, is taking the road "less traveled by." Whether other states head down that road, too, will determine how clean our nation's water will be in the future.
Paul Greenberg won a James Beard Award for his book Four Fish and is the writer-in-residence at the Safina Center. This article was produced in collaboration with the Food & Environment Reporting Network, a nonprofit investigative news organization, with additional reporting by Kirstina Johnson, FERN's associate editor.