Washington, D.C. is a city of rowhouses, many more than a century old. Original plumbing in these homes often includes cast iron drain stacks, galvanized supply lines and, in some cases, lead service lines connecting the house to the water main. DC Water runs programs to identify and replace lead service lines across the District.
Older parts of the city are served by a combined sewer system that carries both stormwater and wastewater, so very heavy rain can strain the system. Basements in rowhouses are common, which makes backwater valves and sump pumps worth considering.
Plumbing services we provide in District of Columbia
These are the services District of Columbia homeowners call about most often, based on the conditions above.
Water Line Repair
Water line repair fixes the underground service line that carries water from the municipal meter or curb stop to the house.
Water Line Repair details →
Sewer Line Repair
Sewer line repair fixes damage to the building sewer or lateral, the pipe that carries wastewater from a house to the public sewer main or septic system.
Sewer Line Repair details →
Drain Cleaning
Drain cleaning is the mechanical removal of buildup, debris or roots from drain and waste pipes so water flows freely to the sewer or septic system.
Drain Cleaning details →
Pipe Repair
Pipe repair is fixing a damaged section of a home's water supply or drain piping, from a pinhole leak or failed fitting to a split caused by freezing.
Pipe Repair details →
Water Heater Repair
Water heater repair restores a tank or tankless water heater to safe, normal operation by fixing components such as thermostats, heating elements, burners, valves and controls.
Water Heater Repair details →Local conditions that affect plumbing in District of Columbia
Lead service lines
Homes built before the mid-20th century may still have a lead service line. DC Water’s service line map and replacement programs are the best starting point before planning any private work.
Rowhouse drain stacks
Shared walls and tight chases make cast iron stack replacement more involved than in detached homes; camera inspections help target repairs.
Combined sewer areas
During intense storms, combined sewers can surcharge and push water back toward basement drains. Backwater valves reduce that risk.
Winter freezes
Pipes in rear additions, unheated porches and exterior walls are vulnerable during cold snaps.
City plumbing guides in District of Columbia
Plumbing emergency in District of Columbia?
- Shut off the main water valve if water is leaking or a pipe has burst.
- Keep away from water near outlets, cords or the electrical panel.
- If sewage is backing up, stop using every drain in the house.
- If you smell gas, leave the building and call the gas utility or 911 from outside.
District of Columbia plumbing questions
How do I find out if my DC home has a lead service line?
Check DC Water’s online service line inventory for your address, or look at the pipe where water enters the basement. Lead is dull gray, soft and shiny when scratched, and a magnet will not stick to it.
Why does my DC basement drain back up in heavy storms?
Much of the older city uses combined sewers that carry rain and wastewater together. When they fill during a storm, water can back up into the lowest drains. A backwater valve installed to code helps prevent this.
Does DC have lead service lines?
Some older DC homes still have lead service lines. DC Water has run lead service line replacement programs; check your address and current program terms with DC Water.
Why does my DC rowhouse basement back up in storms?
Older parts of the city use combined sewers that can surcharge during heavy rain. A backwater valve can help, and DC Water’s Clean Rivers Project has worked to reduce overflows.
Who is responsible for my DC sewer lateral?
Property owners are generally responsible for the private portion of the lateral; DC Water maintains public sewers. Confirm where the boundary falls for your property.
Do rowhouses share plumbing in DC?
Each rowhouse usually has its own lines, but party walls mean a leak can affect neighbors, and older conversions sometimes have unusual layouts.
Do DC homes need permits for plumbing work?
Many plumbing jobs, including water heater replacements and sewer work, require permits through the District’s building authority.
How do I prevent frozen pipes in a DC rowhouse?
Insulate pipes along exterior walls and in unheated rear additions, keep the heat on and disconnect garden hoses before winter.
