Figure 5
From: Distribution of inorganic compositions of Japanese tap water: a nationwide survey in 2019–2024
Piper trilinear diagram showing the relative abundances of major ions and water type characteristics. (A) Japanese tap water (n = 1564) by prefecture indicated together with the average for tap water samples collected in Japan (filled star) and the world (filled circle); (B) worldwide tap water collected from 33 countries (n = 194).
