Unveiling the Truth: Are We Drinking Harmful Chemicals?
A recent study has shed light on a concerning issue within the bottled water industry, revealing the presence of dozens of unregulated, potentially harmful chemicals. This revelation challenges our assumptions about the safety of bottled water and prompts us to delve deeper into the findings.
The study, published in Science Direct, analyzed 64 disinfection by-products (DBPs), both regulated and unregulated, across 10 popular bottled water brands. Shockingly, every brand tested positive for DBPs. However, the story doesn't end there, and it's not all bad news for bottled water enthusiasts.
Susan Richardson, a renowned chemistry professor, and one of the study's authors, offered an insightful perspective. She explained to Newsweek that the bottled waters tested were less contaminated with DBPs compared to tap water. This statement might come as a surprise, but it's an important distinction to make.
Why It Matters: Disinfecting Water, a Double-Edged Sword
Disinfecting drinking water is a critical step in the treatment process, safeguarding us from cholera, typhoid, and other microbial diseases. However, this very process can lead to DBP contamination, raising concerns about potential health risks.
Richardson highlighted the potential dangers, stating, "Many human epidemiologic studies show a risk of bladder cancer, colorectal cancer, miscarriage, and birth defects." These findings are indeed concerning and warrant further attention.
Unregulated DBPs: The Unknown Threat
The study focused on unregulated DBPs, which are not monitored by the U.S. Environmental Protection Agency (EPA) in drinking water and, consequently, in bottled water. These chemicals, including brominated DBPs like dibromoacetonitrile, a known carcinogen, were found in low levels in bottled water, similar to tap water.
But here's where it gets controversial: the study also identified several other unregulated DBPs in bottled water for the first time, such as chloroacetonitrile, dichloroacetamide, and trichloronitromethane. The presence of these chemicals raises questions about their potential health impacts, especially considering their unregulated status.
The Brands in Question
While the brands tested remained unnamed, the study authors noted that "grocery" and "name" brands had higher DBP counts compared to "designer" brands. Additionally, spring water-sourced brands generally showed lower DBP levels than those labeled as "purified."
Two "grocery" brands, which used purified tap water for their bottled water, had significantly higher calculated cytotoxicity, with levels 43 and 83 times higher than the average bottled water.
How Does Bottled Water Become Contaminated?
Richardson explained that many bottled water brands use tap water that undergoes further purification, but not all DBPs are removed in this process. Some brands treat water with ozone, an effective disinfectant, but ozone can also form DBPs. Moreover, spring water can be infiltrated with surface waters contaminated with DBPs.
Bottled vs. Tap: A Complex Comparison
In comparison to tap water, bottled waters have fewer DBPs. On average, only 3 types were detected in bottled water, while tap water had 37. This suggests that bottled water may be a safer option in terms of DBP contamination.
Expert Opinions: A Divided Perspective
Sherri Mason, director of Project NePTWNE at Gannon University, expressed her surprise at the lower DBP levels in bottled water, considering the numerous studies finding other unexpected toxicants in bottled water, such as benzene and micro- or nano-plastics. She stands by the science and regulatory framework, asserting that tap water is safer.
Natalie Exum, a professor at Johns Hopkins Bloomberg School of Public Health, shared a similar view, emphasizing the importance of regulating DBPs of greatest concern in public drinking water to ensure the health of the population.
Vasilis Vasiliou, chair and professor of Environmental Health Sciences at Yale School of Public Health, highlighted the significance of the study's discovery of priority unregulated DBPs in bottled water, challenging assumptions about the purity of certain treatments.
The Bottom Line: A Personal Choice
Despite the study's findings and other research on DBP risks, Richardson advises against switching from tap water to bottled water unless there's a known contamination issue with tap water. She emphasizes the environmental impact of plastic bottles and the higher cost of bottled water.
So, what's the verdict? While bottled water may have lower DBP levels, the unregulated nature of these chemicals leaves room for concern. The choice between bottled and tap water is a personal one, influenced by various factors. What's your take on this issue? We'd love to hear your thoughts in the comments!
