Potassium chlorate (KClO3) is a chemical compound that occurs naturally as a mineral known as chlorate. It is found in small quantities in various mineral deposits, particularly those associated with evaporite environments, such as salt flats and dried-up lakes. Potassium chlorate is also a byproduct of the electrolytic production of potassium hydroxide and chlorine gas.

In nature, potassium chlorate plays a role in the cycling of chlorine in the environment. It is one of the intermediates formed during the oxidation of chloride ions in seawater and other natural water bodies. The oxidation process is often driven by the action of microorganisms, such as certain bacteria and algae, that use chloride as an electron donor during photosynthesis.

Potassium chlorate is also found in some plants, where it may accumulate as a result of the plant's metabolic processes or as a result of the uptake of chlorate from the environment. However, the concentrations of potassium chlorate in plants are typically very low and do not pose a significant risk to human health or the environment.

Overall, potassium chlorate is a naturally occurring substance found in mineral deposits and as a result of microbial activity in the environment. Its presence and distribution are influenced by geological and biological factors, and its concentrations are generally low in natural ecosystems.