May contain gasoline, oil, chemicals, or other types of liquids and they can either be above or below ground. Potential Sources of Groundwater Contamination Other long term effects such as certain types of cancer may also result from exposure to polluted water. Wildlife can also be harmed by contaminated groundwater. Poisoning may be caused by toxins that have leached into well water supplies. Diseases such as hepatitis and dysentery may be caused by contamination from septic tank waste. Dangers of Contaminated GroundwaterÄrinking contaminated groundwater can have serious health effects. In addition, it is possible for untreated waste from septic tanks and toxic chemicals from underground storage tanks and leaky landfills to contaminate groundwater. Road salt, toxic substances from mining sites, and used motor oil also may seep into groundwater. For example, pesticides and fertilizers can find their way into groundwater supplies over time. Materials from the land’s surface can move through the soil and end up in the groundwater. Groundwater contamination occurs when man-made products such as gasoline, oil, road salts and chemicals get into the groundwater and cause it to become unsafe and unfit for human use. Unfortunately, groundwater is susceptible to pollutants. Groundwater is also one of our most important sources of water for irrigation. Over 50% of the United States population depends on groundwater for drinking water.
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