The Citizen Water Advocacy Group has good resources discussing this issue. Here's a video covering frequently asked questions.
Well water levels are declining by more than 1 foot/year in the center of the aquifer, and have declined more than 100 feet in the last 80 years. Wells at the edge of the aquifer, such as in Williamson Valley, are declining from 2 to 7 feet per year (data not shown).
The list of Drought Impacts:
D0 Forage is limited; soil is dry
Fire risk increases
D1 Plants are stressed; hillsides are unusually brown
Stock ponds and creeks are nearly dry; some springs are dry
D2 Water and feed are inadequate for livestock
Fire danger is high; fire crews are mobilizing
Little forage remains for wildlife; pine trees are losing needles
D3 Ranching operations are affected
Fire preparedness increases; fire restrictions are implemented early
Skiing tourism is low; snowpack is extremely low
Wildlife encroach on developed areas in search of food and water
Native plants are stressed
Livestock do not have adequate water; runoff is short; conditions are dusty
D4 Fire restrictions increase; large fires occur year-round
Vegetation green-up is poor; native plants are dying
Lakes, ponds, and streams are dry
