Microplastics
Tiny plastic fragments now detected in nearly all tap water. Health effects still under investigation.
The science, plainly.
Microplastics are plastic fragments smaller than 5 mm, and nanoplastics smaller than 1 µm. They enter water from synthetic textile fibers, tire wear, plastic packaging breakdown, and industrial spills. Detection methods are still being standardized, but recent studies have found microplastics in the vast majority of bottled and tap water samples.
The pathways into the tap.
- Synthetic clothing fibers (laundry effluent)
- Tire wear
- Plastic packaging breakdown
- Cosmetic and personal care products
What the evidence shows.
Microplastics have been found in human blood, lung tissue, placentas, and feces. The health implications are not yet established — research is in early stages, and most concerns about endocrine disruption come from the additives (phthalates, BPA) that leach off plastics rather than the plastic particles themselves.
What we know
Microplastics reach human tissues, including across the placenta. They carry chemical additives and can adsorb other pollutants.
What we don't know
Whether typical exposure causes meaningful inflammation, hormonal disruption, or long-term disease in humans. Honest answer in 2026: we don't yet know.
What the law allows vs. what's actually safe.
Note: No federal MCL. California is developing a sampling standard. EPA is funding research but has not proposed a regulation.
Where exposure is highest.
Detected nationwide. Highest near textile, industrial, and high-population areas.
Filtration that actually works.
- Reverse osmosis (most effective)
- 0.2-micron or finer filtration
- Activated carbon (partial)
We don't recommend brands. The certification on the box matters more than the brand printed on it. Look for the actual NSF/ANSI standard number specific to the contaminant you're removing.
Sources
- Microplastics Research — U.S. Environmental Protection Agency