From April 6, 2009, through May 4, 2009, residents in the District of Columbia, Arlington County, Va., and Falls Church City, Va., (including portions of Fairfax County served by Falls Church City) may notice a slight difference in taste and smell in their drinking water.  That taste is chlorine.  During this period, there will be a temporary change in the chemistry of the disinfectant added to drinking water at the water treatment plants.  The disinfectant kills bacteria in the water and helps keep the pipes in the distribution system clean.

Read more from the DC Water and Sewer Authority at http://www.dcwasa.com/news/listings/press_release383.cfm.