Chloride 

The maximum level for chloride was established primarily as an aesthetic standard. The concentration at which the average person can detect a salty taste from chloride in drinking water is 250 mg/L. A very high chloride level can lead to corrosion of pipes and heating equipment and is usually associated with an elevated sodium level. Sewage contamination, run-off from road salting or an improperly maintained water softener may cause elevated chloride.