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2 
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If you don't get your drinking water from a river or reservoir, you probably get it from here 
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3 
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The total area underground that is filled with water. Above it is the zone of aeration 
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4 
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A body of water underneath of an impermeable layer such as bedrock or clay 
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5 
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Certification that a product meets a certain level of water efficiency. This is to water what EnergyStar is to electricity 
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6 
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Rain water that flows over the surface, often into a stormdrain, to a local stream and ultimately to the ocean 
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7 
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The highest point of the groundwater, closest to the surface 
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9 
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A body of underground water close to the surface 
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10 
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An impermeable layer underground that water cannot easily pass through 
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11 
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When rain water seeps underground into an aquifer 
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