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Most water table aquifers are polluted, yet they are the primary sources of urban and rural water supply. Sustainable hydrology in this millennium will capture in-situ treatment and protection of shallow aquifers particularly in developing countries. Permeable reactive barrier (PRB), biological and electrochemical methods with air and steam injection techniques will advance. Ex-situ pump and treat method is slow, costly and unsustainable. Many private treatment plants for pump-treat-use havedoi:10.5897/ijwree2013.0458 fatcat:n3mfmng7lve35imnx2ntcl3fvq