CNN — Almost half of the tap water in the US is contaminated with chemicals known as “forever chemicals,” according to a new study from the US Geological Survey.
The number of people drinking contaminated water may be even higher than what the study found, however, because the researchers weren’t able to test for all of these per- and polyfluorinated alkyl substances, or PFAS, chemicals that are considered dangerous to human health. There are more than 12,000 types of PFAS, according to the National Institutes of Health, but this study looked at only 32 of the compounds.
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The scientists collected water samples directly from taps at 716 locations – 269 from private wells and 447 from public sources – between 2016 and 2021. Based on their findings, they estimate that at least one PFAS chemical would be detected in 45% of US drinking water samples.
So chemicals that are dangerous to human health were found in 45% of water but we shouldn’t worry? Nah bro I’m putting reverse osmosis filters and boiling it.
RO water is seen as unsuitable for consumption due to lack of important minerals. Activated carbon filters should help with reducing PFAS
i’ve heard that’s a myth, but just in case you can add a re-mineralizer module to most RO systems as a last stage.
Edit: so it’s not a myth but needs context
https://www.who.int/publications/i/item/9241593989
Here is a relatively old WHO report, page 88 basically says if you’re getting enough nutrients from food then the impacts of reduced minerals in water aren’t significant. Conversely on page 158 they show increased risk of cardiovascular disease and death in animals from demineralized water, however, they do concede that those were external studies, the methods may not meet modern scrutiny but should not be outright dismissed. In other words more information is needed.
The pdf is from 2005 so there’s probably newer studies out there. In any case adding an alkaline filter makes RO water taste better and it’s cheap enough to not have to worry about it.