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Groundwater contamination from pesticides causes reproductive damage within wildlife in ecosystems.Sewage, fertilizer, and agricultural run-off contain organic materials that when discharged into waters, increase the growth of algae, which causes the depletion of oxygen.  The low oxygen levels are not able to support most indigenous organisms in the area and therefore upset the natural ecological balance in rivers and lakes.Swimming in and drinking contaminated water causes skin rashes and health problems like cancer, reproductive problems, typhoid fever and stomach sickness in humans.  Which is why it’s very important to make sure that your water is clean and safe to drink.Industrial chemicals and agricultural pesticides that end up in aquatic environments can accumulate in fish that are later eaten by humans.  Fish are easily poisoned with metals that are also later consumed by humans.  Mercury is particularly poisonous to small children and women.  Mercury has been found to interfere with the development of the nervous system in fetuses and young children.Ecosystems are destroyed by the rising temperature in the water, as coral reefs are affected by the bleaching effect due to warmer temperatures.  Additionally, the warm water forces indigenous water species to seek cooler water in other areas, causing an ecological damaging shift of the affected area.Human-produced litter of items such as plastic bags and 6-pack rings can get aquatic animals caught and killed from suffocation.Water pollution causes flooding due to the accumulation of solid waste and soil erosion in streams and rivers.Oil spills in the water causes animal to die when they ingest it or encounter it.  Oil does not dissolve in water so it causes suffocation in fish and birds.
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Major Effects of Water Pollution 
1) The food chain is damaged. When toxins are in the water, the toxins travel from the water the animals drink to humans when the animals’ meat is eaten. 
2) Diseases can spread via polluted water. 
3) Acid rain contains sulfate particles, which can harm fish or plant life in lakes and rivers. 
4) Pollutants in the water will alter the overall chemistry of the water, causing changes in acidity, temperature and conductivity. These factors all have an affect on the marine life. 
5) Marine food sources are contaminated or eliminated by water pollution. 

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