What is the average alkalinity of a freshwater stream?

The average alkalinity of a freshwater stream typically ranges from 20 to 200 mg/L as calcium carbonate (CaCO3), though it can vary significantly depending on the geology of the watershed, land use, and seasonal factors. Alkalinity is a measure of the water's capacity to neutralize acids, largely influenced by the presence of bicarbonates, carbonates, and hydroxides. Streams in areas with limestone or other carbonate-rich soils generally have higher alkalinity compared to those in silicate-dominated regions. Monitoring alkalinity is essential for assessing water quality and ecosystem health.