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Changes in water levels in wells reflect changes in recharge to, and discharge from an aquifer. Generally groundwater is rain water or water from surface water bodies, like rivers, lakes or streams that permeate into the soil and bedrock and is stored underground in the pores spaces between soil particles. Groundwater pollution occurs when hazardous substances come into contact and dissolve in the water in the soil or on the surface. Groundwater is generally less susceptible to contamination and pollution when compared to surface water, naturally impurities in rainwater or surface water which replenishes groundwater systems, get removed while infiltrating through soil strata.