covered a blogger roundtable with DC Water, discussing about a wide range of issues related to the DC utility that supplies our drinking water and treats the sewage of DC and surrounding municipalities.
Our website reported on an interesting map that showed the location of reservoirs in the city, and how each one serves areas at a common elevation, regardless of the reservoir's proximity. Unfortunately, the map had to be redacted due to "security concerns" regarding the ability to glean information regarding the water system from the map.
Interestingly enough, the Washington Post ran an article ten days ago regarding a broken water main in Montgomery County. That article included a link (PDF) to a map that shows the water main network for the Washington Suburban Sanitary Commission (WSSC) in Prince Georges and Montgomery counties.
To the best of our knowledge, no one has requested that map be redacted, since it has been online longer and hosted on a website that gets viewed my many more people than the DC map we posted. Perhaps it's because the map is not very sharp, thus making it difficult to ascertain the location of information depicted on the map.