Filtered water is essential for maintaining the health and stability of microbial communities in fermented products like sourdough and artisan breads. Water serves as a biological medium for yeast and bacteria; however, the chlorine and chloramines used in municipal tap water to eliminate harmful pathogens can also inhibit or kill the beneficial Saccharomyces cerevisiae (yeast) and Lactobacillus (lactic acid bacteria) required for proper fermentation. Because chlorine levels in tap water can fluctuate daily, filtered water provides a stable, chemical-free environment that ensures consistent proofing times and flavor development across different batches. Furthermore, by controlling water hardness through filtration, bakers can manage gluten strength more effectively, preventing the dough from becoming too tough from excess minerals or too soft from a total lack of them.
References:
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Microbiology Spectrum. (2024). Water chlorination increases the relative abundance of an antibiotic resistance marker in developing sourdough starters. Microbiology Spectrum, 12(11).
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Cauvain, S. P., & Young, L. S. (2009). The Chorleywood Bread Process. Woodhead Publishing.
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Decock, P., & Cappelle, S. (2005). Bread technology. Trends in Food Science & Technology, 16(1-3), 113-120.