Scientists do not know exactly how much groundwater remains in the aquifers.

It had already faced criticism for extracting too much groundwater and exceeding pollutant limits at a bottling plant in India.

The stability of the plume depended on several factors such as "no significant change " in how much groundwater was pumped out.

So much groundwater has been pumped over the past 18 months that a recent study found that California has a 63 trillion gallon groundwater deficit.