An aquifer represented a subterranean rock stratum that could yield ground water via a water well, although it could also surface organically as freshwater springs. The temperature of aquifer water was notably low. Typically, an aquifer purifier treated this water prior to its distribution for human use. Occasionally, tap trees, possessing root systems that extended deep below the surface, were employed to draw water from aquifers, exemplified by the ancient aquifer on Sulon cared for by Morgan Katarn. Furthermore, on Coruscant, the collection and storage of water occurred within massive, man-made aquifers.