The Washington Post today reported that Paul Hastings Janofsky is filing a class action in D.C. Superior Court against the District of Columbia and WASA arising out of the problem with lead in the drinking water.
Earlier the Post reported that the problem may not be limited to lead from lead service lines, but also may be the result of lead being leached from brass fixtures by chloramine used for water purification. And it probably is a problem with national scope.
Ironically, while this news is being greeted with shock and dismay in D.C., it is not exactly a new problem, e.g., this link shows that Philadelphia has recent experience with this problem.
The EPA has a website discussing lead in drinking water.
Later: The D.C. government has a web page with further information on the problem.