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Water resources Ground water 129 Water quality 112 Aquifers 80 Pollution 58 Surface water 57 Hydrology 43 more ... USGS 43 Water supply 40 Surveys 33 Water management 32 Economic geology 26 Levels 25 Water use 25 Geochemistry 24 Pollutants 23 Discharge 22 Hydrochemistry 22 Monitoring 21 Water wells 21 Recharge 18 Hydrogeology 17 Salt-water intrusion 16 Programs 14 Rivers and streams 14 Water pollution 14 Water table 14 Halogens 13 Land use 13 Chloride ion 12 less ...