35 ng per capsule

Geosmin, like sugar beets or damp soil”

Certified water flavour standard used to train professional tasters to recognize and scale the intensity of geosmin character. Geosmin imparts an unpleasant earthy odour to water, reminscent of sugar beets or damp soil. It is extremely flavour-active and for that reason one of the most common flavour problems associated with potable water. This earthy flavour is formed by bacteria and algae in reservoirs, lakes and pipework. It is produced by actively-growing microorganisms and also arises as a result of the decomposition of dead cells.

Food grade | free from sensory impurities | extensively tested | safe to smell and taste.

Flavour cards

Flavour standard information

Technical specification

Geosmin odour in water is best detected as follows. Without covering the glass, swirl the sample to release the aroma. Take a single short sniff. Repeat as necessary.
Amount of flavour per capsule
35 ng per capsule
The flavour threshold of geosmin in water is 10 ng /.
Geosmin is formed in water by Actinobacteria, Cyanobacteria and algae. These can be found in lakes, reservoirs and water distribution systems. Geosmin is produced by both actively-growing organisms and through cell lysis and decomposition.
Geosmin imparts an unpleasant earthy odour to water which is reminiscent of sugar beets or damp soil. Extremely odour-active and for that reason one of the most common flavour faults in potable water.
CAS registry number
The CAS registry number for geosmin is 23333-91-7.
Other names
  • 2beta,6alpha-dimethyl bicyclo(4.4.0)decan-1beta-ol
  • octahydro-4,8a-dimethyl-4a(2H)-naphthol
  • 2b,6a-dimethyl bicyclo[4.4.0]decan-1b-ol
  • 2beta,6alpha-dimethyl bicyclo[4.4.0]decan-1beta-ol
  • 1,10-(E)-dimethyl-(E)-(9)-decalol
  • (E)-1,10-dimethyl-(E)-decalin-9-ol
  • 2b,6a-dimethyl bicyclo(4.4.0)decan-1b-ol
  • 2,6-dimethyl bicyclo(
  • 4,8a-dimethyl decalin-4a-ol
  • 4,8a-dimethyl-1,2,3,4,5,6,7,8-octahydronaphthalen-4a-ol
  • octahydro-4,8a-dimethyl-4a(2H)-naphthalenol
  • octahydrodimethyl-4alpha-naphthol
Geosmin flavour problems are most commonly associated with surface abstracted waters. Its formation can be influenced by weather conditions, when concentration of organic materials in the water can lead to growth of microorganisms.
Threshold distribution
Capsules per pot
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