Most of the water used for human consumption comes from rivers and lakes or from wells. Potassium not absorbed by crop roots is absorbed by soil particles, which minimizes the risk of potassium leaching. Potassium that penetrates deeper soil layers and reaches aquifers presents no ecological threat. Potassium is not known to produce any harmful 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, it presents no hazard to human health.

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

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