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A drop of water splashing into a bucket under a leak

Sewage backup cleanup in Bellingham

When a floor drain in the basement starts pushing up gray-brown water, the job changes category. Restoration companies call it black water, and Fixr's rate for it, $7 to $7.50 a square foot, runs about twice the clean water rate. The extra cost pays for tearing out more material and disinfecting what stays.

Updated October 29, 2026

On this page
  1. The first half hour
  2. What gets thrown away
  3. Why lines back up here
  4. Coverage
  5. Cost

The first half hour

  1. Turn off the taps, all of them. No flushing, no dishwasher, no laundry. With a blocked main, whatever goes down any drain in the house comes up at the lowest one.
  2. Close the area off. Shut the door to the room if there is one, and keep children and pets on the other side.
  3. Leave the furnace off if it, or a return air vent, is in the affected space.
  4. Take pictures of the water and the drain or toilet it came from while it is still there.
  5. Make two calls. A plumber or sewer contractor clears the line, and a restoration crew cleans the house. Until the line is clear, it can back up again.

What gets thrown away

Porous materials absorb sewage and can't be disinfected all the way through. That generally means carpet and pad go, along with drywall to a cut line above the highest wet mark, and the stud bays behind it get cleaned and treated before drying starts. Sealed tile, concrete and most hard furniture can be cleaned in place. If the estimate lists something for removal, the crew should be able to tell you why.

Dark mold growing in streaks on a white painted wall
Mold streaking a painted wall. EPA guidance: get wet materials dry inside 24 to 48 hours to head this off. Photo: Hydra 4x / Unsplash

Why lines back up here

South and central Bellingham has the county's oldest houses: 41% of homes in ZIP 98225 predate 1980 (Census ACS). Laterals from that era are often clay or cast iron, and tree roots find the joints. Add a few years of kitchen grease and a slow drain becomes a backup. Out in the county, the problem is more often the septic system. After weeks of winter rain (the airport averages 169 wet days a year) a drain field can be too saturated to take more, and the overflow has nowhere to go but back toward the house.

Coverage

A standard homeowners policy often leaves out sewer and drain backup, unless a backup endorsement was added. Look for that endorsement on your declarations page before cleanup starts. If river floodwater pushed sewage into the house, the claim belongs to flood insurance. How claims work in Washington.

Cost

Fixr's $7 to $7.50 per square foot covers the cleanup alone. Tear-out and rebuilding come on top, and a basement rec room or a crawl space under the wet rooms can double the square footage in a hurry. The cost guide.

Questions Whatcom County homeowners ask

Can I clean up a small sewage backup myself?

If it stayed on a tile bathroom floor and you got to it quickly, maybe, with rubber gloves, boots and a disinfectant. Once it soaks into carpet or the bottom of a wall, the contamination is inside the material, and surface cleaning won't reach it.

Does homeowners insurance cover a sewage backup?

Many policies cover it only through a sewer and drain backup endorsement, and exclude it without one. Check yours, call your agent before the cleanup crew arrives, and photograph everything regardless of the answer.

Is it safe to stay in the house?

A backup confined to one bathroom with the door shut usually isn't a reason to leave. If it reached bedrooms or living space, got into the ductwork, or someone in the house has a weakened immune system, stay somewhere else until the cleanup is finished.

Sources

  1. Fixr: Water Damage Restoration Cost (updated January 31, 2025)
  2. US EPA: Mold Cleanup in Your Home (updated June 4, 2026)
  3. NOAA Applied Climate Information System: Bellingham International Airport daily data (GHCN USW00024217)