Alkalinity, dissolved

Overview

Alkalinity of water is defined as the capacity for solutes in the water to react with and neutralize acid. Sources of alkalinity include limestone and decomposition of organic matter. Alkalinity is important in determining a stream’s ability to neutralize acidic pollution from rainfall or wastewater. The pH levels in low-alkalinity streams can decrease to a point that eliminates acid-intolerant forms of aquatic life. Fish are particularly affected by low pH water. Alkalinity information is used by water treatment managers to determine amounts of chemicals to add during the treatment process.