upgradient

Etymology
From.

Adjective

 * 1) A position up along a gradient from a starting position.
 * 2)  a location that is the source groundwater for another location; similar to upstream.
 * Uncontaminated groundwater is found upgradient of a contamination source.

Adverb

 * 1) The reverse direction along a gradient.
 * 2)  a direction that groundwater flows from.