The Sea water contains high potassium, apart from the sea water intrusion/ ingress especially in coastal areas; there are many other sources for potassium in ground water of coastal as well as other regions, which can be shared.
Potassium can be sourced from anthropogenic sources like potassium rich fertilizers. They can also be derived from rocks containing or rich in K-bearing minerals. Furthermore, areas with trapped brine/saline water from past geologic time could also serve as K source in groundwater. These are possible sources for non-coastal environ.
Apart from chemical fertilizers as mentioned by Tunbosun, they can be due to geology of the area.
Potassium can be resulted from the chemical decomposition of the sylvite and silicates, especially clay minerals. It can be added to groundwater through the application of fertilizer as well as breakdown of waste products.
Thanks Dr Owolabi, Dr Tonmoy and Dr Kiprotich, The Chemical fertilizers can be one of the sources if specially in the rural areas where the potash fertilizers being used but in may urban areas also it is found. Geological formation may be one of the reason apart from effect of local sewage and waste material.
K-containing silicates are most common and erodes due to rainwater and groundwater releasing K+ and acidity.
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