Trichloroethylene (TCE) was the main contaminant. The maximum level detected in drinking water was 1,400 ppb in May 1982. The current limit for TCE in drinking water is 5 ppb. Other contaminants detected included DCE (trans 1,2-dichloroethylene), PCE, and benzene. DCE was detected at a maximum of 407 ppb in January 1985. There were multiple sources of contamination including leaking underground storage tanks and waste disposal sites. The most contaminated wells were shut down by February 1985. The water modeling is ongoing. Currently, it is unknown when contamination of some Hadnot Point wells began, but it may have begun as early as the late 1940s or early 1950s. When the water modeling is completed, the dates when the system was contaminated will be determined.