Bitter tasting water can be the result of an improper level of Alkalinity (measured as Calcium Carbonate, CaCO3) or the presence of Sulfate.
Low Alkalinity water tends to dissolve minerals and metals while High Alkalinity water tends to precipitate minerals and metals. There is no Federal limit for Alkalinity but Low is considered <30 mg/L and High is considered >300 mg/L.
Sulfate is found in natural deposits in the earth and finds its way into underground water supplies. The proposed Maximum Contaminant Level is 500 mg/L. The potential health effects from ingestion is Diarrhea.
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