Reading Time: 8 minutes


Safeguarding your drinking water: What you can do


Dee J. Hall, the Center’s managing editor, discusses the problem of arsenic in drinking water in Wisconsin on Milwaukee Public Radio.

This Series

Failure at the Faucet is a series exploring risks to drinking water across Wisconsin. Read more.

Having trouble with the quality of your water? Send us an email at

By the time Bradley Burmeister met his high school science teacher more than a decade ago, concerns had already surfaced about an ancient poison that was appearing in drinking water around their Fox River Valley community. Burmeister never suspected, though, that his family’s well would provide some of the scariest data.

High levels of arsenic, a substance used as a poison since the Middle Ages, had been detected in 1989 in several counties in the Fox Valley region of northeastern Wisconsin. In 2003, Seymour High School science teacher Dennis Rohr and his students began a study of private well water samples from the area that would continue for the next five years.

The arsenic level the students detected in the Burmeister family’s well was off the charts: 1,650 parts per billion (ppb), or 165 times the federal health standard of 10 ppb. Burmeister — whose experience in the study sparked an interest in science that culminated in medical school — recalls it being the highest level found in the study.

“My parents weren’t too surprised, they just said, ‘That’s probably our luck,’ ” Burmeister said. “We started drinking bottled water all the time and also used that for cooking.”

Michigan State University student Bradley Burmeister reacts to receiving word in 2014 that he will serve his medical residency at the Medical College of Wisconsin in Milwaukee. Burmeister was motivated to study science and go to medical school after participating in a project at Seymour High School to test local drinking water. It showed many residents in and around the Outagamie County community, including his family, had dangerously high levels of arsenic in their water. Clear River Photography

To this day, Burmeister’s parents regularly buy a case of gallon-sized water jugs at the grocery store. Despite the inconvenience, Burmeister said his parents feel it is a more affordable way to address their arsenic problem than drilling a new well or purchasing a water treatment system.

The Burmeisters are not the only family having to find alternatives to turning on the tap; arsenic is a major concern in Outagamie and Winnebago counties. The Wisconsin Department of Natural Resources designated an arsenic advisory area in these counties in 1993 and implemented stricter regulations for testing and well construction in 2004 and 2014.

But arsenic problems are not confined to northeastern Wisconsin. Levels above the federal standard have been detected in 51 of Wisconsin’s 72 counties, according to a 2006 Wisconsin Groundwater Coordinating Council report.

The most serious health effects from arsenic exposure include a variety of cancers, nerve damage, diabetes and cardiovascular disease. Chronic low-level exposure during childhood has also been linked to decreased intelligence.

In a 2014 study, researchers studying schoolchildren in Maine found regular consumption of drinking water containing 5 ppb of arsenic or more was associated with a significant IQ reduction in students in grades three to five.

“The magnitude of the association … raises the possibility that levels (of arsenic in drinking water) that are not uncommon in the United States pose a threat to child development,” the researchers found.

A 2015 study of infants led by Dartmouth University researchers found that arsenic in a mother’s urine, likely due to her consumption of contaminated well water during pregnancy, “was associated with a higher risk of infection during (an infant’s) first year of life … and with diarrhea and respiratory symptoms.”

Human activity can mobilize arsenic

In 2001, the U.S. Environmental Protection Agency lowered the federal health standard, or maximum contaminant level, for arsenic in public drinking water from 50 to 10 ppb. This step reflected the increasing scientific evidence for the dangers of arsenic exposure to human health and matched the World Health Organization’s global drinking water standard.

The highest level ever detected in the state was found in a private well in northeastern Wisconsin. The well tested at 15,000 ppb — 1,500 times the new federal threshold.

“We have an arsenic hot spot in Wisconsin,” said John Luczaj, a geoscience associate professor at the University of Wisconsin-Green Bay.

University of Wisconsin-Green Bay associate professor John Luczaj has documented numerous contaminants in Wisconsin’s groundwater, including arsenic. The ancient poison can be found in drinking water around the state, but especially in Outagamie and Winnebago counties in northeastern Wisconsin. UW-Green Bay

Madeline Gotkowitz, a hydrogeologist at the Wisconsin Geological and Natural History Survey, agreed. “Arsenic is a big problem in Wisconsin, and I don’t think many realize that,” she said.

The dangerous chemical can end up in groundwater through multiple mechanisms. In Wisconsin, arsenic is typically released when naturally occurring sulfide minerals in certain types of bedrock aquifers break down by coming into contact with oxygen.

In 1987, the DNR discovered that the St. Peter Sandstone aquifer in northeastern Wisconsin contains a high concentration of these sulfide minerals. Knowing that it was the water source of more than 20,000 private wells, agency officials knew this might spell trouble.

“Seymour High School rests directly above the St. Peter Sandstone formation,” science teacher Rohr said. “So arsenic was the main focus (of our water study) as it impacted our local community the most.”

The oxygen that sets off the breakdown of sulfide minerals can be introduced by well drilling and disinfection methods, or when the water table — the level below which the ground is saturated with water — is drawn down. This may occur during periods of drought, or be triggered by human use, such as the operation of high-capacity wells.

Because of this interplay between geology and human activity, Luczaj said, private wells whose water previously tested fine for arsenic may lose their integrity.

Patrick Laughrin is all too familiar with the effect of high-capacity wells in his part of the state. He lives in Hilbert in Calumet County, just east of Winnebago County.

Pat Laughrin, a member of the Calumet County Board, says water at his home used to have elevated levels of arsenic caused by a drop in the water table after installation of nearby high-capacity wells. But water levels have returned to normal after a neighboring farm owner reduced pumping, he said, and the most recent tests show no arsenic. Certain activities, such as drawdown, can increase the presence of the natural contaminant, scientists say. Ed Byrne / The Brillion News

“The arsenic in our well showed up for the first time when the high-capacity wells came in and dropped the water table,” Laughrin said. “It makes sense. If you drop the water table, you get more oxygen and that releases more arsenic into your water.”

State steps up regulation

In 2004, the DNR introduced tougher arsenic laws in Winnebago and Outagamie counties. With 20 percent of the private well samples there analyzed in 1992-93 exceeding the EPA’s new health standard of 10 ppb, this area was thought to pose the greatest exposure threat to the largest number of residents. The new regulation required all drilling and disinfection methods to minimize the exposure of sulfide rocks to oxygen.

For Luczaj, this was a step in the right direction, but he said it may not go far enough.

“The geology doesn’t stop at political boundaries,” Luczaj said. “The area definitely extends into the neighboring counties. It’s pretty likely that we’ll see increasing problems as aquifers get drawn down.”

Former University of Wisconsin-Stevens Point student Jessica Peterson prepares water samples to test for metals and arsenic at the school’s Center for Watershed Science and Education. Some parts of Wisconsin have unsafe levels of arsenic in the drinking water. Debra Sisk / UW-Stevens Point

A 2013 study of 3,868 private wells from across the state found 2.4 percent of them exceeded arsenic levels of 10 ppb. If that proportion was applied to all of the estimated 940,000 households on private wells in Wisconsin — a calculation endorsed by the study’s lead author — residents of 22,560 homes may be consuming unsafe levels of the chemical.

Testing, grants rarely used

The DNR has a well compensation grant program that makes residents whose well water exceeds 50 ppb of arsenic — five times the federal standard — eligible for up to $9,000 to drill a new well. The program can be used to address other types of contamination as well.

Seymour High School teacher Dennis Rohr’s class study starting in 2003 of arsenic in nearby private drinking water wells led to greater understanding of the problem — and sparked a lifelong interest in science in his student, Bradley Burmeister, who is now a physician. Seymour School District

However, during the past five years, only 10 or fewer grants were awarded per year. Households whose water contains up to 49 ppb — almost 10 times the amount of arsenic shown to impact a child’s intellectual development — have to cover the cost of a new well on their own, or pay for other options that will make their water safe to drink.

To reduce arsenic exposure, people must be aware of its presence in their drinking water in the first place. But with a mere 16 percent of private well owners in Wisconsin estimated to test their water annually, the number of residents who are unaware is large.

Raising that awareness was part of Rohr’s goals when he began his water study in 2003. In 2014 — 11 years after Rohr’s study — the DNR revised its arsenic regulation yet again, recognizing the persistent nature of Wisconsin’s arsenic problem.

This time, the new state law required that arsenic, in addition to coliform bacteria and nitrate, be tested at the time of a property transfer, but only if the buyer requests a well inspection. The same three contaminants also have to be tested after the completion of certain well repair work, such as fixing a broken water pump.

Laughrin said the new law helps address one of his long-held concerns with people only testing their water for bacteria and nitrate: when those results are within safe ranges, they assume everything else is fine as well. And yet their water may be contaminated with arsenic or other substances for which the water has never been tested.

Given the potential for negative health effects from regular consumption of unsafe drinking water, Laughrin suggested another group of stakeholders who could play a large role in raising people’s awareness: family physicians.

“When my wife and I went to our doctor’s office four or five years ago, they did not even ask if we had a private or municipal well,” he said. “They’re starting to do it more often now. But there’s a lot to go on this yet.”

Bad wells replaced by city water

Some communities in Wisconsin have addressed their arsenic problem by offering citizens a switch from private to municipal water. The Stilson family in Oshkosh took advantage of this opportunity in 2000, following several years of having bottled water delivered to their home after the level of arsenic in their well rose to 999 ppb, or nearly 100 times the health standard.

“We said, ‘Let’s just get city water and get it over with,’ ” Lynn Stilson said. “Some people kept their well so they could use the water for their lawn, but ours was capped, we just got it all done at once. I think at this point everybody here has city water.”

In 2013, the city of Algoma water utility in Kewaunee County offered discounted arsenic testing to private well owners to gauge their interest in connecting additional homes to public water.

They found that 9 percent of the 330 homeowners who participated had levels above 10 ppb, with a maximum of 1,000 ppb. In 2014, the utility built water main extensions in neighborhoods with at least 70 percent of residents indicating an interest in switching to municipal water.

City water is required by law to be tested regularly for arsenic, which takes the burden of monitoring water quality off the homeowners’ shoulders. And public wells have another advantage over private wells: they tend to be drilled deeper.

“The private wells are generally shallower and more likely to draw water from near the water table,” Luczaj said. “In general, municipal wells are also constructed at higher quality than private wells.”

Wisconsin’s public water systems have only rarely exceeded the federal arsenic standard, although municipal well operators in some places, including the village of Suring in Oconto County, continue to struggle with arsenic problems that first emerged six years ago.

When drilling a new well is too expensive, a switch to city water not possible, or purchasing bottled water too big a hassle, another remediation option is to install an in-home water treatment system. The most cost-effective method is called a reverse osmosis system, which removes 95 percent of arsenic, as well as other contaminants.

Luczaj said vigilance is the key to avoiding arsenic, since human activity can increase the amount of the naturally occurring contaminant in well water. “A one-time test for arsenic is not at all sufficient,”he said.

Added Kevin Masarik, groundwater education specialist at the UW-Stevens Point: “A lot of people only test their water because they perceive a problem based on a color or odor issue. But they are largely ignorant of important tests to consider (for contaminants) that they may not be able to taste, see or smell.”

Gabrielle Menard and Elise Bayer, students in the University of Wisconsin-Madison School of Journalism and Mass Communication, contributed to this story. This report was produced as part of journalism classes participating in The Confluence, a collaborative project involving the Wisconsin Center for Investigative Journalism and UW-Madison School of Journalism and Mass Communication. The nonprofit Center ( collaborates with Wisconsin Public Radio, Wisconsin Public Television, other news media and the UW-Madison School of Journalism and Mass Communication. All works created, published, posted or disseminated by the Center do not necessarily reflect the views or opinions of UW-Madison or any of its affiliates.

Republish our articles for free, online or in print, under a Creative Commons license.

Popular stories from Wisconsin Watch