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What are the pH levels considered acidic for water?

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The pH levels considered acidic for water typically fall below 7 on the pH scale, indicating a higher concentration of hydrogen ions compared to hydroxide ions. Research indicates that the pH of popular bottled waters and beverages is often found to be acidic, with values below 7, potentially impacting dental health and systemic effects . Moreover, studies suggest that the surface of pure water can exhibit acidity with a pH below 4.8 due to proton stabilization, affecting the behavior of weak acids like carbonic acid . Additionally, the pH of water used in pesticide spray mixes influences pesticide effectiveness, with values below 7 indicating acidity and impacting solution properties logarithmically . Furthermore, electrolysis of pure water can produce acidic water with a pH around 4.5, suitable for dermatological applications .

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Open access Effects of water pH on the stability of pesticides (2002) Frederick M. Fishel 01 Jan 2002 8 Citations	pH levels below 7 are considered acidic for water. The logarithmic scale indicates that pH 6 is 10 times more acidic than pH 7, and pH 5 is 100 times more acidic.
Open access•Journal Article•DOI Water surface is acidic. Victoria Buch, Anne Milet, Robert Vácha, Pavel Jungwirth, J. Paul Devlin - Show less +4 more 01 May 2007-Proceedings of the National Academy of Sciences of the United States of America 345 Citations	The water surface is acidic with a pH predicted to be below 4.8 due to the presence of hydronium ions, indicating acidity levels below 4.8.
Journal Article•DOI The Natural Lowdown on pH Brooks Hanson 11 Feb 2000-Science 1 Citations	pH levels considered acidic for water can be as low as -3.6, as demonstrated by Nordstrom et al. in extremely acidic ground waters at Iron Mountain, California, due to sulfuric acid formation.
Open access•Journal Article Is Your Drinking Water Acidic? A Comparison of the Varied pH of Popular Bottled Waters Kellie F Wright 01 Jun 2015-American Dental Hygienists Association 7 Citations	The study found that most popular bottled waters tested were acidic, with pH values below 7, contrary to their reported values. pH levels below 7 are considered acidic for water.
Patent Electrolyzed acidic water for personal care ph 4.5 +/-1.5 Magued George Amin, Heba-T-Allah Fekry Kamel - Show less +1 more 06 Feb 2008	pH levels considered acidic for water are around 4.5 +/- 1.5, as produced by electrolyzed acidic water in the study, suitable for personal care due to its skin-friendly pH similarity.

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