Well injection is defined as the “subsurface emplacement of fluids through a bored, drilled or driven well; or through a dug well where the depth is greater than the largest surface dimension and a principal function of the well is the subsurface emplacement of fluids” (EPA, 1979). Deep-well injection of wastewater effluents is an engineering tool that can be either most valuable for the freshwater resources of an area or very detrimental to the quality of the waters of that area. Which of these two alternatives takes place depends entirely on how we handle this tool in the particular area with which we are concerned.

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