Bottled Water (Plastic)

Single-use PET bottles.

42Moderate burden · out of 100

Cleaner swapFiltered tap water in a glass or steel bottle

How this score is built

100Start
81.6Chemical hazard 4 × 4.6−18.4
57.8Everyday exposure 7 × 3.4−23.8
42Persistence 6 × 2.6−15.6, then rounded to 42
ModerateThe band42 sits in 40–59.

What each input rests on

The three ratings behind the score, and the studies each rests on
Input	Rating	Evidence
Chemical hazard	4/10	A rapid systematic review of 3 human and 28 animal studies concluded microplastic exposure is “suspected” to harm reproductive, digestive and respiratory health; birth outcomes were “unclassifiable”. Effects of Microplastic Exposure on Human Digestive, Reproductive, and Respiratory Health: A Rapid Systematic Review · Environ Sci Technol 2024 DOI 10.1021/acs.est.3c09524 · PMID 39692326 · Abstract · read 2026-10-02
Everyday exposure	7/10	93% of 259 bottles from 11 brands showed microplastic contamination, an average of 325 particles per litre counting particles down to 6.5 um. Synthetic Polymer Contamination in Bottled Water · Front Chem 2018 DOI 10.3389/fchem.2018.00407 · PMID 30255015 · Abstract · read 2026-10-02 Micro- and nanoplastics in bottled water were estimated at about 2.4 ± 1.3 × 10^5 particles per litre. Rapid single-particle chemical imaging of nanoplastics by SRS microscopy · Proc Natl Acad Sci U S A 2024 DOI 10.1073/pnas.2300582121 · PMID 38190543 · Abstract · read 2026-10-02
Persistence	6/10	Micro- and nanoplastics, mainly polyethylene, were found in decedents’ liver, kidney and brain; liver and brain concentrations were higher in 2024 than in 2016 deaths. A correction to the paper has been published. Bioaccumulation of microplastics in decedent human brains · Nat Med 2025 DOI 10.1038/s41591-024-03453-1 · PMID 39901044 · Abstract · read 2026-10-02

Ratings are editorial. A study listed here supports the rating; it did not compute it. How the index is built

What this means for you

The persistence rating is the standout concern here — these compounds linger in the body and environment for years. Studies find microplastic and nanoplastic particles in most bottled water, shed from the plastic itself and worsened by heat and storage time.

Evidence strength: strong

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