You are what you drink… 

So when your water is loaded with fluoride, microplastics, chlorine, PFAS, arsenic, and dozens of other contaminants, so are you. 

In fact, growing research links those exact contaminants to the exact wellness concerns top of mind for most of us, from poor sleep and dull skin to brain fog, gut issues, weakened immunity, low mood, and out-of-whack hormones. 

The good news? 

Cleaner water could fuel better sleep, healthier skin, sharper focus, a happier gut, stronger immunity, a brighter mood, and more balanced hormones among other things… who knew?

• Growing research links common tap water contaminants to some of today's biggest wellness concerns, from poor sleep and dull skin to mental health concerns and hormonal imbalance.

• Fluoride has been linked to shorter sleep. Microplastics have been tied to accelerated skin aging. PFAS have been connected to weakened immunity. Arsenic has been linked to depressive symptoms. And the list goes on.

• Ordinary carbon filters target as few as 5 contaminants, leaving most of these dangers untouched.

• Clearly Filtered leverages advanced Affinity® Filtration Technology to protect you from up to 365+ dangerous contaminants, including hundreds ordinary water filters miss.

Of course, cleaner water is easier said than done…

Ordinary water filters rely on carbon filtration technology that targets as few as 5 of the 324+ contaminants found in our tap water supplies. 

Here are seven dangers to steer clear of, and the specific wellness concerns they've been linked to.

On top of fluoride's link to lower IQ in children, did you know the contaminant could also be quietly disrupting your sleep? 

Fluoride naturally concentrates in the pineal gland, the tiny organ in your brain that makes melatonin (the hormone that tells your body it's time to sleep). And when that gland gets overloaded with fluoride, melatonin production may drop. 

In a 2021 study published in Environmental Health, researchers found that adults drinking water with higher fluoride levels faced a 34% greater risk of sleeping less than the recommended duration for their age. Related research has also linked higher fluoride exposure to later bedtimes and shorter overall sleep.

More than 72% of the U.S. population is served fluoridated water. And while ordinary carbon filters don't target fluoride, Clearly Filtered does.

A landmark 2017 investigation by Orb Media found microplastics in 94% of U.S. tap water samples tested, including water sampled at the EPA's own headquarters. And a 2024 study found that a single liter of bottled water averages roughly 240,000 plastic fragments, about 90% of which are nanoplastics. Nanoplastics are the tiniest of the bunch, small enough to slip through your intestinal wall, enter your bloodstream, and travel to your organs and tissues. 

A 2024 study in Environmental Pollution found that once these particles reach skin cells, they can trigger mitochondrial damage, inflammation, and accelerated skin aging, which could potentially show up as dullness, fine lines, reduced elasticity, and a skin barrier that struggles to repair itself. 

While ordinary carbon filters rarely catch particles this small, Clearly Filtered's best-selling Filtered Water Pitcher removes up to 99.99% of microplastics from your water.

Did you know manganese, a metal commonly found in tap water, is behind those dark stains on your bathtub? 

For years it was dismissed as an aesthetic issue, but in a 2022 NeuroToxicology study analyzing CDC NHANES data, researchers found that older adults with the highest blood manganese levels scored significantly lower on the Digit Symbol Substitution Test, a standard measure of processing speed and working memory. 

Manganese naturally leaches into groundwater across large stretches of the US, and there's no enforceable federal limit for it in tap water. In other words, manganese can legally show up in your glass at any level. While ordinary carbon filters don't target manganese, several Clearly Filtered filtration systems do.

Chlorine is added to tap water to kill bacteria. Then it reaches your gut, where roughly 100 trillion bacteria are doing some of your body's most important work, from digestion to immunity to mood regulation. 

In a September 2024 randomized controlled trial, researchers followed 197 infants for a year. Those drinking regular tap water showed measurable shifts in gut microbiome composition and elevated levels of antibiotic-resistance genes. This could imply that their gut bacteria were becoming harder for antibiotics to kill if they ever got sick and needed them. 

A separate 2024 study in Science of the Total Environment found chlorinated water significantly reduced gut bacterial diversity in mice, with direct effects on beneficial strains like Lactobacillus. Lower diversity matters because a thriving gut often depends on a wide range of bacteria working together, and when that balance tips, so can everything the microbiome regulates.

PFAS, the "forever chemicals" in non-stick pans, fast-food wrappers, and the drinking water of roughly 158 million Americans, are a family of compounds that don't easily break down in the environment or in your body. Some individual PFAS, like PFHxS, can linger in your bloodstream for nearly a decade. 

Your immune system fights infection by producing antibodies, the defender cells that recognize and neutralize viruses and bacteria. In general, the more antibodies your body can produce, the better it can fend off whatever's going around. In a 2026 study published in Environmental Research, Michigan State University researchers found that fully vaccinated adults with higher levels of PFHxS in their blood produced roughly 40% fewer protective antibodies after a COVID vaccine, compared to adults with lower exposure. 

Because PFHxS is just one member of the larger PFAS family, it’d be reasonable for researchers to suspect similar immune effects could extend across other PFAS compounds.

“Exposure to PFAS is widespread," said professor Courtney Carignan, the author of the 2026 study, "but it is also preventable. Reducing levels in drinking water is one of the most effective ways to lower exposure and protect public health.” 

While ordinary carbon filters weren't built to protect you from PFAS, several Clearly Filtered filtration systems are.

While arsenic has already been linked to several types of cancers, emerging research suggests it may be just as dangerous for your mood.

In a 2024 study of nearly 10,000 US adults published in the Journal of Affective Disorders, researchers found that adults with higher levels of arsenic in their bodies, a biomarker of how much they'd been drinking in, had significantly higher rates of depressive symptoms. 

The more arsenic, the higher the risk…

Arsenic is a known neurotoxin, and researchers suspect long-term exposure may interfere with the neurotransmitters tied to mood regulation. While ordinary carbon filters don't target arsenic, several Clearly Filtered filtration systems do.

Atrazine is one of the most widely used herbicides in the United States…

A comprehensive 2024 review in Toxicology confirmed that atrazine is "recognized as an environmental endocrine disruptor" that enters the body primarily through drinking water and can disrupt the reproductive system, thyroid, and adrenal glands. 

The concerns are serious enough that the European Union banned atrazine decades ago. Yet in the US, the EPA still allows it in drinking water at 3 parts per billion. That’s roughly 30 times higher than the level EWG considers a one-in-a-million cancer risk. 

Earlier research has also linked atrazine exposure in tap water to irregular menstrual cycles and lower estrogen levels in women. 

While ordinary carbon filters don't target atrazine, Clearly Filtered does.

If you are what you drink, then the fastest way to upgrade how you feel isn't necessarily another supplement or gadget…

Why not start with what enters your body every day? A cleaner glass of water. 

While ordinary carbon filters target as few as 5 contaminants, Clearly Filtered targets up to 365+, including many of the contaminants in this blog. And unlike reverse osmosis systems, our advanced Affinity® Filtration Technology does not target healthy minerals like calcium, potassium, and magnesium. 

From our best-selling Filtered Water Pitcher and eco-friendly Filtered Bottles to our Universal Inline Fridge Filter and our 3-Stage Under-the-Sink System, there's an option for every home. Tap here to upgrade your water and your wellness.