Sulfate
A naturally occurring mineral that can cause a bitter taste and laxative effects at high concentrations.
ADWG Guideline
500 mg/L
Sulfate (SO42-) occurs naturally in water from the dissolution of gypsum, shale, and other sulfate-bearing minerals. It can also enter water from industrial discharge and acid mine drainage.
Why it matters
The ADWG sets an aesthetic guideline of 500 mg/L:
- Taste: Noticeable bitter or medicinal taste above 250 mg/L
- Laxative effect: Concentrations above 500 mg/L may cause temporary gastrointestinal effects, especially in visitors not accustomed to the local water
- Corrosion: High sulfate can accelerate corrosion of concrete pipes and structures
Typical values
Urban Australian water supplies generally have sulfate well below 100 mg/L. Higher levels are found in bore water in arid regions and areas with gypsum geology.
Related Terms
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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.