Most of the water used for human consumption is obtained from rivers and lakes or from wells. Potassium not absorbed by crop roots are absorbed by soil particles which minimizes the risk of potassium leaching. Potassium that penetrates deeper soil layers and reaches aquifers present no ecological threat. Potassium is not known to produce any deleterious effect on the quality of natural and drinking waters and it does not induce eutrophication in rivers and lakes. But even when potassium is present in drinking water or food is does not pose any hazard to human health.

Potassium fertilizers do not contain any of the heavy metals that are considered toxic and environmentally hazardous. Potassium fertilizers are not referred to as potential hazards in relation to radioactive elements.

Moreover, potassium fertilizers positively affect the environment. Potash fertilizers enable plants to utilize nitrogen fertilizers more effectively thus preventing nitrates from seeping through soil layers and mixing with surface and ground water reserves. In addition, potash fertilizers decrease the content of radioactive elements in food crops grown on contaminated land.