{"id":54200,"date":"2026-05-18T16:44:02","date_gmt":"2026-05-18T13:44:02","guid":{"rendered":"https:\/\/kyivcityroast.com.ua\/how-water-hardness-and-ph-affect-the-taste-of-coffee\/"},"modified":"2026-05-18T16:46:05","modified_gmt":"2026-05-18T13:46:05","slug":"how-water-hardness-and-ph-affect-the-taste-of-coffee","status":"publish","type":"post","link":"https:\/\/kyivcityroast.com.ua\/en\/how-water-hardness-and-ph-affect-the-taste-of-coffee\/","title":{"rendered":"How water hardness and pH affect the taste of coffee"},"content":{"rendered":"\n

The invisible influence of water on taste<\/strong><\/h2>\n\n

Water is not just H2O. It’s a complex mixture of minerals, ions and chemical compounds that dramatically affects the taste of drinks. Two key parameters – water hardness and pH – determine whether your coffee will be bright and balanced, and your tea will be aromatic and full-bodied. <\/p>\n\n

Minerals in water act as invisible architects of flavor. Understanding these parameters allows you to control the quality of beverages at a professional level. <\/p>\n\n

What is water hardness and pH?<\/strong><\/h2>\n\n

pH is defined as a measure of the concentration of hydrogen ions in water. The pH scale is logarithmic from 0 to 14, where pH 7 is neutral. A value below 7 indicates an acidic environment, above 7 – an alkaline environment. <\/p>\n\n

Water hardness is determined by the concentration of dissolved mineral salts, primarily calcium and magnesium salts. TDS (Total Dissolved Solids) measures the total amount of dissolved substances in water. <\/p>\n\n

Chemical nature of water<\/strong><\/h3>\n\n

Calcium ions (Ca2+) and magnesium ions (Mg2+) enter the water as they pass through geological rocks. Calcium hydrogen carbonates Ca(HCO3)2 create temporary hardness. Sulfates and chlorides create permanent hardness. <\/p>\n\n

The norm of total hardness of drinking water in Ukraine is 3-4 mmol\/dm\u00b3 Source<\/a>.<\/p>\n\n

Parameter.<\/strong><\/td>Units<\/strong><\/td>Optimal range<\/strong><\/td><\/tr>
pH<\/td>–<\/td>6.5-7.5<\/td><\/tr>
Stiffness<\/td>ppm CaCO3<\/td>75-175<\/td><\/tr>
Mineralization<\/td>mg\/l<\/td>100-150<\/td><\/tr><\/tbody><\/table><\/figure>\n\n
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How water hardness affects the taste of drinks<\/strong><\/h2>\n\n

Water hardness has a dramatic effect on the extraction of flavor compounds. Did you know that minerals act as catalysts for various chemical processes? <\/p>\n\n

Water with calcium promotes the extraction of acids but binds bitter compounds. This creates a balanced flavor profile. Magnesium enhances the extraction of fruit acids, making the flavor brighter. <\/p>\n\n

Soft water versus hard water<\/strong><\/h3>\n\n

Soft water (below 90 ppm) creates a bright, acidic profile. Coffee made with this water has clear fruity notes. But it can appear flat due to over-extraction. <\/p>\n\n

Hard water (above 150 ppm) produces beverages with a fuller body. The acidity is muffled. However, such beverages may have a bitter aftertaste. <\/p>\n\n