In general, water for irrigation comes from two main sources, river systems and underground aquifers.

A top issue, he said, is keeping pesticides and other contaminants out of the water, which comes from an underground aquifer.

"He has now created the potential for a major environmental problem in a state that relies on underground aquifers for much of its water."

The oceans and lakes are crawling back into great underground aquifers.

There are two main underground aquifers that provide fresh water to modern day Israel.

With no lakes or rivers, all water supplies come from underground aquifers.

The economic model will be even less viable as underground aquifers run out in the next two or three decades.

The underground aquifer the city relies on has declined by about five feet a year.

This system was replaced in 1982 with a well which gets water from an underground aquifer.

There innovative system uses a series of wells which are linked to a large underground aquifer.