Looks like M at 15th 17th Street, NW. Thanks to a reader for sending.

Photo by PoPville flickr user John Sonderman

From a press release:

“DC Water reminds customers that lead sources are different in each property and urges residents to eliminate lead pipes and plumbing materials in their homes. Recent results from the utility’s required lead testing program mark the lowest lead levels measured in the last decade. Levels have continued to decline since 2004, when the water treatment process began including a corrosion control additive to reduce lead release in water. Since 2003, DC Water has replaced more than 19,000 lead service pipes on public property, representing the removal of nearly 115 miles of lead pipes that connect public water mains to household plumbing. DC Water replaces lead service pipes during water main upgrades or when customers choose to replace their portion of pipe on private property. Read More