After years of unknowns, Lexy's doctor noticed abnormalities in her growth plates, which led him to believe that her symptoms could be the result of a toxic exposure. A toxicologist found that Lexy had been exposed to benzene, a volatile organic compound (VOC). Because neither her brother nor grandmother were sick—and, seemingly, no other kids at her school—her doctor said she likely had a higher than average sensitivity to benzene.
Benzene is found in tobacco smoke, wood smoke, vehicle exhaust, and industrial emissions. It's also emitted into the air during both fracking and conventional oil and gas extraction, and is often found in fracking wastewater. Research has found that some workers at fracking sites are regularly exposed to high levels of benzene. Exposure is linked to cancer, organ damage with repeat exposure, fertility issues, skin and eye irritation, drowsiness and dizziness.
Despite having moved to a new neighborhood and a new school district, the levels of trans, trans-muconic acid—a biomarker for benzene — measured in all nine urine samples EHN collected from Jane Worthington and her grandchildren exceeded the U.S. median.
Two agencies -- The American Conference of Governmental Industrial Hygienists and its German equivalent, the DFG (Deutsche Forschungsgemeinschaft)— established reference values that reflect people's typical background level exposure for trans, trans-muconic acid. The levels of trans, trans-muconic acid measured in five of the nine urine samples EHN collected from Jane Worthington and her grandchildren over a 5-week period exceeded both of those reference values by up to 11-fold.**
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While Jane has frequently fretted over air emissions, she didn't previously worry about their water. At both their old home and their new one they used the local municipal service provided by Pennsylvania American Water, and at both houses the family consumed unfiltered tap water.
"I've always assumed they'd take care of making sure it's safe," Jane said.
We found benzene in the water at all three locations we sampled at Jane's house—the kitchen tap, the bathtub faucet, and the outdoor hose spigot. The highest level was in the outdoor hose spigot, which contained benzene at a level of 3.46 parts per billion. This was the highest level of benzene detected in the five households in our study.
Both the U.S. Environmental Protection Agency (EPA) and the Pennsylvania Department of Environmental Protection (DEP) have a maximum legal threshold of 5 parts per billion for benzene in drinking water, but the EPA has set a goal of no detectable benzene in drinking water because it can cause leukemia.
The levels of contaminants detected in different faucets at the same house can vary for a number of reasons, Chris Kassotis, an endocrine toxicologist and assistant professor at Wayne State University's Institute of Environmental Health Sciences, who has researched water quality extensively, told EHN. He explained that after water enters the home, it sometimes sits in pipes or tanks where it can pick up additional contaminants, and it sometimes travels through filtration systems that remove contaminants.