VOCs are found in a variety of commercial, industrial, and residential products, including gasoline, solvents, cleaners, degreasers, paints, inks, dyes, and pesticides. Most VOCs can be detected by odor. When VOCs are spilled or disposed of on or below the land the VOC contaminants can migrate through soil and into the groundwater. Once they enter groundwater, VOCs can remain there for years. These chemicals move with the groundwater and pose a threat to nearby drinking water wells.