Geosmin and MIB
Geosmin and Methylisoborneol (MIB) are naturally occurring compounds that have an earthy taste and odour. Human noses and tastebuds can detect Geosmin and MIB at very low concentrations.
We routinely monitor for Geosmin and MIB in the water supply. These compounds are sometimes present in drinking water, but not usually at noticeable levels. Seasonal increases in naturally occurring algae or bacteria in water sources can cause a rise in Geosmin and/or MIB above the taste and odour threshold.
Frequently asked questions
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What are the effects of Geosmin and MIB?
Geosmin and MIB produce a musty, earthy smell and taste in drinking water, but they are not harmful at levels present in this water.
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What causes increased levels of Geosmin and/or MIB?
Some kinds of algae and bacteria naturally present in dams can produce Geosmin and/or MIB, and increased concentrations of these microorganisms can cause the Geosmin and/or MIB to rise above the taste and odour threshold
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What can be done about Geosmin and MIB?
Geosmin and MIB are not removed from water using routine treatment processes.
During times of increased Geosmin and MIB levels, we may reduce the amount of water drawn from the affected water source. Additional treatment processes such as Powdered Activated Carbon (PAC) dosing may also be implemented to remove these compounds.