Measurement Unit: mg/L

Chloride

A mineral ion that affects the taste of water and can indicate saltwater intrusion or contamination.

ADWG Guideline

250 mg/L

Chloride (Cl-) is one of the most common ions in natural water. It comes from the dissolution of salt deposits, seawater intrusion, road de-icing (less common in Australia), and some industrial processes.

Why it matters

The ADWG sets an aesthetic guideline of 250 mg/L:

  • Taste: Salty taste detectable above 200–300 mg/L
  • Corrosion: High chloride levels accelerate corrosion of metal pipes and fittings
  • Indicator: Rising chloride levels may indicate saltwater intrusion into aquifers

Note: Chloride is the dissolved ion (Cl-); it is different from chlorine (Cl2), the disinfectant.

Related Terms

Sodium Total Dissolved Solids (TDS) Conductivity

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Disclaimer: Glossary definitions are provided for general educational purposes only and do not constitute medical advice or professional guidance. For specific health concerns about your drinking water, consult a qualified health professional. See our Terms of Use.