Which parameter is most commonly tested to assess water corrosivity?

pH is a critical parameter in assessing water corrosivity because it directly influences the acidity or alkalinity of the water. Water with a low pH (acidic) can be more corrosive as it tends to dissolve metals and minerals more readily from pipes and fixtures, which can lead to higher concentrations of lead, copper, and other harmful substances in drinking water. Conversely, water with a high pH (alkaline) can have different corrosive effects, often leading to scaling and the deposition of minerals. Therefore, monitoring pH is essential for understanding potential corrosion issues in water systems and ensuring safe drinking water quality.

Alkalinity, hardness, and temperature also play roles in water chemistry and can influence water quality and treatment processes, but they are not the primary indicators for assessing corrosivity like pH is.