Water Glossary: G

giardia	The genus name for a group of single-celled, flagellated, pathogenic protozoas found in a variety of vertebrates, including mammals, birds, and reptiles. These organisms exist either as trophozoites or as cysts, depending on the stage of the life cycle.*
glacial striations	Lines carved into rock by overriding ice, showing the direction of glacial movement.
greywater	Domestic wastewater that does not contain human wastes such as tub, shower, or washing machine water
gross alpha (a) particle activity	The total radioactivity caused by alpha particle emission as inferred from measurements on a dry sample. It is regulated by the US Environmental Protection Agency.*
gross beta (b) particle activity	The total radioactivity caused by beta particle emission as inferred from measurements on a dry sample. It is regulated by the US Environmental Protection Agency.*
groundwater	Water that has percolated into natural, underground aquifers; water in the ground, not water puddled on the ground.
groundwater recharge or replenishment	Pumping or percolating storm water runoff or imported water into an aquifer to replenish its supplies.
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