Well water that effervesces may contain high levels of carbon dioxide in the form of carbonic acid. Carbonic acid is also a name sometimes given to solutions of carbon dioxide in water (carbonated water). Carbonic acid is a weak acid. The primary effects of high levels of carbon dioxide is decrease of pH and subsequent increased corrosively of pipes and fittings in contact with water.
Not toxic or carcinogenic. Carbonated water may erode tooth enamel, though the effect is considered negligible.
Carbon Dioxide (CO2)
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Carbon dioxide levels were detected in your water sample. There is no health-based standard for carbon dioxide. If you have concerns about the levels detected, please consult your physician.