Preferred term

groundwater pollution

Is replaced by

[GEMET] Contamination of any water found under the earth's surface by any leaching pollutants, such as inorganic compounds (chlorides, nitrates, heavy metals, etc.), synthetic organic chemicals (pesticides, fertilizers, etc.) and pathogens (bacteria, parasites, etc.).

http://vocabs.lter-europe.net/EnvThes/msa0523