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Drains & sewer in Washington, DC

A single slow sink is usually a local clog a plumber can clear in one visit. Several drains backing up at once, gurgling toilets or water at a basement floor drain point to the main sewer line, which may need cleaning, a camera inspection and sometimes repair.

  • Licensed local plumbers
  • The problem explained before work starts
  • Price agreed before the job begins
Plumber working on the drain pipes under a sink

Drains & sewer services in Washington

Local conditions

Drains & sewer in Washington: what's different

D.C. rowhouses in Capitol Hill, Petworth and Columbia Heights have long drain runs and old cast iron, and older parts of the city have combined sewers. DC Water's Clean Rivers tunnels reduce overflows, but rowhouses can still see basement backups during heavy storms.

Many renovated rowhouses have basement bathrooms below the sewer line that rely on ejector pumps. A failed pump or a clogged lateral shows up in the basement first. Permits come from the D.C. Department of Buildings.

Water and sewer in Washington
DC Water provides water and sewer service across the District.
Permits in Washington
Plumbing permits are issued by the D.C. Department of Buildings.

Washington housing and plumbing

Rowhouses from the late 1800s and early 1900s in Capitol Hill, Petworth and Columbia Heights often have basements, cast-iron drains and old service lines.

Other Washington conditions that affect plumbing

  • Combined sewer backups: Older parts of the city have combined sewers that can back up during heavy storms.
  • Lead service lines: DC Water has a program to replace lead service lines.
  • Rowhouse drains: Shared-wall rowhouses have long drain runs and old cast iron.
  • Clean Rivers project: DC Water's Clean Rivers tunnels reduce combined sewer overflows, but older rowhouses can still see basement backups in heavy storms.

Neighborhoods and ZIP codes

Plumbers on Thawline cover Washington and District of Columbia, including Capitol Hill, Petworth, Georgetown, Brookland, Columbia Heights, Navy Yard. ZIP codes: 20001 · 20002 · 20003 · 20004 · 20005 · 20006.

When to call a plumber in Washington

  • Water backing up in the tub or shower when a toilet flushes
  • Several fixtures draining slowly at the same time
  • Water or sewage at a basement floor drain
  • Gurgling from drains or toilets
  • Sewer smell inside or a soggy patch in the yard
  • The same clog returning within weeks of being cleared

How these problems start and how to choose between repair options is covered in the drains & sewer guide.

Drains & sewer questions in Washington

Why does my D.C. rowhouse basement back up during storms?

Older combined sewers can fill during heavy rain and push water back through basement drains. A backwater valve helps, as does keeping the lateral clear.

Are chemical drain cleaners safe to use?

They can damage older pipes and fixtures, and they make the job hazardous for the plumber if they don't work. A plunger or a drain snake is safer for a single slow drain.

More plumbing in Washington

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