D.C. Mun. Regs. tit. 21, r. 21-203
When there is a complaint of a leak in a building sewer connection, the Director shall determine if the leak is in public space.
If the Department determines that the leak is in public space, the leak shall be repaired at no cost to the property owner.
If the Department determines that the leak is not the responsibility of the District, the property owner shall be notified and shall be responsible for having the leak repaired by a registered master plumber at the owner's expense.
If a leaking sewer is a public nuisance or hazard, or the leak is damaging property, the water supply to the premises will be shut off immediately to abate the problem and shall remain shut-off until repairs are made.
If the property line and the building line are the same, and the leak is on public space, the Department shall insert the repaired service into the building. The owner shall be responsible for internal connection.
D.C. Mun. Regs. tit. 21, r. 21-203