In 1997 the Louisiana Department of Health and Hospitals detected harmful levels of vinyl chloride, a chemical used in plastics manufacturing, in the Upper Plaquemine Aquifer. However, the department failed to inform local residents of the contamination until five years later in 2001. Vinyl chloride is a suspected carcinogen very rarely studied in ground water. Residents of the nearby Myrtle Grove trailer park sued Dow Chemical. The company denied that it was the source of the contamination. However, a Judge found the company responsible and required Dow to carry out a plan of Monitored Natural Attenuation. With rising insurance rates and health concerns the Myrtle Grove trailer park was closed and its residents evicted.