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Water Glossary: A B C D E F G H IL M N O PQ R S T UV WZ

odor threshold

The minimum odor of a water sample that can just be detected after successive dilutions with odorless water.1 The odor threshold is reported as the threshold odor number.



A structure that is produced by [some] coccidian protozoa (i.e., Cryptosporidium) as a result of sexual reproduction during the life cycle. The oocyst is usually the infectious and environmental stage, and it contains sporozoites. For the enteric protozoa, the oocyst is excreted in the feces.*


organic chemical

A chemical having a carbon-hydrogen structure.*



A gas derived from oxygen that is bubbled through water during the treatment processes to kill microorganisms.


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