Groundwater contamination is very difficult and sometimes impossible to clean up. Chemicals used in drycleaning, wood preservation, asphalt operations, machining and the repair of cars, planes and electrical equipment are known as dense non-aqueous phase liquids. These chemicals will are heavier than water and will sink quickly into the ground making clean up extremely difficult. Drinking water is rarely tested for these contaminants outside of major cities. #knowyourrisk #p