Meanings of common contaminant in English

She and her coauthors note that arsenic occurs naturally in bedrock and is a common contaminant of well water.

According to the FDA's website, NDMA is a common contaminant found in water and foods including cured and grilled meats, dairy products and vegetables.

Background: Atrazine and nitrate are common contaminants in water, and there is limited evidence that they are associated with adverse birth outcomes.

Other species are common contaminants of food and beverages, and some may cause unwanted changes in the taste or smell of water.