2026-04-20
Bottled Water Has More Microplastics Than Tap Water. The Math Is Wild.
Your office pays premium prices for bottled water because it's "cleaner" than tap water.
The research says otherwise.
The Plastic Problem Nobody Talks About
I sell water systems. So I have skin in this game. But the numbers don't lie.
A 2018 study in Frontiers in Chemistry tested 259 bottles from 11 brands across nine countries. 93% showed microplastic contamination, and the researchers measured roughly twice as many particles larger than 100 micrometres in bottled water as in tap water — 10.4 per litre against 5.45. That's not a typo. The bottle is the more contaminated option.
Think about that for a second. You're paying significantly more for water that may contain more plastic particles.
The Scale Makes No Sense
Your office probably goes through dozens to hundreds of bottles per week. Many of those bottles likely contain microscopic plastic particles. And you're drinking them.
The irony is perfect. You buy water in plastic bottles to avoid contamination. But the plastic bottles are often the contamination source.
What About Health Effects?
The WHO reviewed the evidence in 2019 and concluded that microplastics in drinking water "don't appear to pose a health risk at current levels" — while saying the information is limited, calling for more research, and pushing for a crackdown on plastic pollution.
That's medical speak for "we don't know yet, but probably not great long-term."
The Math on Office Impact
The two waters are also contaminated differently. The tap water figure comes from the same group's survey of 159 tap samples in 14 countries, where 98% of what was found was fibres. In the bottled samples, 66% were fragments — and the most common polymer was polypropylene, which is what caps are made from. When one brand was tested in both glass and plastic, the glass held 204 particles per litre and the plastic 1,410. Some of the plastic is coming from the packaging itself.
A 2024 PNAS study that could see much smaller particles found roughly 240,000 per litre in bottled water, about 90% of them nanoplastics. The 2018 numbers were the floor, not the ceiling.
From water they paid extra for because they thought it was cleaner.
Filtration Changes Everything
Point-of-use filtration certified to the NSF/ANSI 401 microplastics reduction claim has to remove at least 85% of particles in the 0.5–1 micron range. No plastic bottles means no plastic contamination from packaging. The water tastes better and contains fewer contaminants than what you're buying in bottles.
Your office spends significant money on bottled water that may contain more plastic than tap water. That money could buy filtration that actually removes contamination instead of potentially adding it.
The Bigger Picture
PFAS regulations are evolving. Microplastics research is expanding. Water quality standards continue to develop. Studies frequently show contamination concerns in bottled water.
But offices keep buying the same plastic bottles with potential plastic contamination. Because that's how we've always done it.
The premium water often contains more plastic than the free stuff. Your office may pay extra for contamination. The math makes no sense.
If your office is in Wisconsin: I cover the Madison area for Bottleless Nation. I'll test what's coming out of your tap and show you the numbers before you decide anything — see bottleless water coolers in Madison or get in touch.