Wells at risk amid spike in floods
Storms driven by warming climate a threat to water
ST. LOUIS — After a record-setting Midwestern rainstorm that damaged thousands of homes and businesses, Stefanie Johnson’s farmhouse in Blandinsville, Illinois, didn’t have safe drinking water for nearly two months.
Flood water poured into her well, turning the water a muddy brown and forcing Johnson, her husband and their two young children to use store-bought supplies. Even after sediment cleared, testing found bacteria — including E. coli, which can cause diarrhea. The family boiled water for drinking and cooking. The YMCA was a refuge for showers.
“I was pretty strict with the kids,” said Johnson, who works with a private well protection program at the local health department. “I’d pour bottled water on their toothbrushes.”
Though estimates vary, roughly 53 million U.S. residents — about 17% of the population — rely on private wells, according to a study conducted in part by Environmental Protection Agency researchers. Most live in rural areas. But others are in subdivisions near fast-growing metro regions or otherwise beyond the reach of public water pipes.
While many private wells provide safe water, the absence of regulation and treatment afforded by larger municipal systems may expose some users to health risks, from bacteria and viruses to chemicals and lead, studies have found.
Risks are elevated after flooding or heavy rainfall, when animal and human feces, dirt, nutrients such as nitrogen and other contaminants can seep into wells.
And experts say the threat is growing as the warming climate fuels more intense rainstorms and stronger and wetter hurricanes.
“New areas are getting flooded,” said Kelsey Pieper, a Northeastern University professor of environmental engineering. “We know the environment is shifting and we’re playing catch-up, trying to increase awareness.”
Pieper is among scientists conducting well testing and education programs in storm-prone areas. After Hurricane Harvey caused widespread flooding along the Texas coast in 2017, sampling of more than 8,800 wells in 44 counties found average E. coli levels nearly three times higher than normal, she said.
Two years later, above-average snowfall and a March storm unleashed flooding in Nebraska. Levees and dams were breached.
Fremont, a city of more than 25,000, turned into an island when the nearby Platte and Elkhorn rivers overflowed.
The municipal system continued to supply drinking water but some nearby private wells were damaged or contaminated. Julie Hindmarsh’s farm was flooded for three days, and it took months to make the well water drinkable again. At times, the cleanup crew wore protective suits.
“They didn’t know what was in that floodwater,” she said.
Groundwater is often a cleaner source than surface supplies because soil can provide a protective buffer, said Heather Murphy, an epidemiologist at the University of Guelph in Canada. But she said that can give well owners a false sense of security, leading them to forgo testing, maintenance and treatment.
“There’s a big misconception that it’s underground, therefore it’s safe,” said Murphy, who estimates 1.3 million cases of acute gastrointestinal illness in the U.S. are caused annually by drinking untreated water from private wells.
Old, poorly maintained wells are especially vulnerable to floodwaters entering through openings at the top. “It just runs right in and it’s full of bacteria,” said Steven Wilson, a well expert at the University of Illinois.
It doesn’t always take a flood or hurricane to pollute wells. Industrial contamination can reach them by seeping into groundwater.
Around 1,000 residential wells in Michigan’s Kent County were tainted for decades with toxic perfluoroalkyl and polyfluoroalkyl substances, or PFAS, in landfill sludge from footwear company Wolverine
World Wide. The pollution, discovered in 2017, spurred lawsuits and a $69.5 million settlement with the state that extended city water lines to affected houses.
“We thought we were getting this pristine, straightfrom-nature water and it would be much better for us,” said Sandy Wynn-Stelt, who has lived across from one of the dump sites since the early 1990s.
She said tests detected high levels of PFAS chemicals in her water and blood. In a suit later settled, she blamed the contamination for her husband’s 2016 death from liver cancer. She was diagnosed with thyroid cancer four years later.
A lot of harm can be prevented if owners make sure the well’s top keeps out debris and that the pump is turned off before a storm to keep out floodwaters. Experts recommend testing
after a flood and decontaminating wells with chlorine if a problem is found.
While many owners know how to maintain their wells, others ignore problems even if the water isn’t sanitary. Water that tastes fine can still be contaminated.
“I wish I had a nickel for everyone who’s walked into a workshop and said, ‘I’ve been drinking this water forever and it’s fine,’ ” said Jason Barrett, who directs a Mississippi State University program that educates well owners.
Some owners avoid testing because they are concerned it will reveal an expensive problem. Johnson, the Illinois resident whose well was fouled by the 2013 downpour that killed four people and caused $465 million in flood damage, paid about $3,500 for repairs and upgrades.
“Luckily, none of us became ill,” she said.