As of 2007, 57,000 pounds, or 28.5 tons of TCE have been removed from the system of wells that once supplied drinking water to the residents of Scottsdale, Arizona. One of the three drinking water wells previously owned by the City of Phoenix and ultimately sold to the City of Scottsdale, tested at 390 ppb TCE when it was closed in 1982. The City of Scottsdale recently updated its website to clarify that the contaminated wells were "in the Scottsdale area," and amended all references to the measured levels of TCE discovered when the wells were closed (including "390 ppb") to "trace".