It is one of the major anions found in water and wastewater. The recommended maximum contaminant level is 250 mg/L, since the chloride ion imparts a salty taste to the water. If ions of Calcium and Magnesium are present, the chloride ion may not impart a salty taste until over 1000 mg/L. In addition to human and animal waste, sources of chloride can include natural geological formations, road salt storage and applications, oil / natural base drilling, and saltwater intrusions. High levels of chloride can attack and weaken metallic piping and fixtures and inhibit the growth of vegetation. Chloride ion is detected using a titrametric or potentiometric method.