The water that is drawn from a deep well was precipitation which fell on the Earth’s surface. Water seeped into the soil and, with time, filled the porous spaces in subsurface materials. Groundwater will not show large particles, like leaf fragments, that are present in surface streams as the ground filters out large particles, as well as minerals and chemicals too small to be seen.
Groundwater can contain a variety of elements that we do not want to be in our drinking water. Some substances are man-made (like hydrogen sulfide), while others are found naturally. The groundwater may contain organic compounds or even petroleum that has leached from an industrial site, for example. To find out more about Groundwater Remediation, take a look at a site like https://soilfix.co.uk/services/soil-and-groundwater-remediation
If the well is near farmland where certain types of chemicals are used on crops, or if it is near a petrol station with a leaky storage tank, then contaminated groundwater may occur. Groundwater can be contaminated by leakage from septic tanks and/or waste disposal sites. Septic tanks can introduce bacteria into the water. Pesticides and fertilisers can seep through the soil to end up in well water. A well could have been built on land that had previously been used as a chemical or garbage dump. It is always a good idea to test your well water for contaminants.
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