Iron makes up at least 5% of the earths core. So, when it rains out, the rainwater seeps into the soil and starts to dissolve some of the iron that is in geologic layers beneath. This dissolved iron then seeps into the aquifers below that are used to source our wells for drinking water. Therefore, it is common for iron to be present in our water. However, it is rarely found in high concentration and therefore not a great health risk. A certain level of iron in our system is healthy and tap water actually supplies 5% of our daily requirement of iron in the US.
In the other answer, that’s 5% of the earth’s crust rather than core. Iron makes up a lot more of the core, but that is not accessible to ground and surface water for leaching.
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