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However, if there is no layer or it is cracked, contaminants from the landfill (car battery acid, paint, household cleaners, etc.) can make their way down into the groundwater. Landfills are supposed to have a protective bottom layer to prevent contaminants from getting into the water. Landfills are the places that our garbage is taken to be buried. If there is a leak, these contaminants can eventually make their way down through the soil and into the groundwater. Hazardous waste sites can lead to groundwater contamination if there are barrels or other containers laying around that are full of hazardous materials. today, there are thought to be over 20,000 known abandoned and uncontrolled hazardous waste sites and the numbers grow every year. An improperly designed, located, constructed, or maintained septic system can leak bacteria, viruses, household chemicals, and other contaminants into the groundwater causing serious problems. Septic systems are designed to slowly drain away human waste underground at a slow, harmless rate. Onsite wastewater disposal systems used by homes, offices or other buildings that are not connected to a city sewer system. If the contaminants leak out and get into the groundwater, serious contamination can occur. There are estimated to be over 10 million storage tanks buried in the United States and over time the tanks can corrode, crack and develop leaks. 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 Groundwaterĭrinking 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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