The water that comes from bores, wells and springs is what we call 'groundwater'. Groundwater is one of the largest sources of fresh water in South Australia.
There are 31 SA Water-owned drinking water supply systems that draw on ground water as their primary source. Most of these are in the South East, Eyre Peninsula and in the state's northern regions. This includes the Blue Lake in Mount Gambier. Although the lake is also one of our reservoirs, it contains, and is replenished by, groundwater from an underground aquifer.