Phone answered 24/7 · Bellingham, WA and nearby communities

Call 24/7: (360) 685-7801
Whatcom Creek Water Damage HelpBellingham, WA · Answered 24/7

How Do You Clean a House After a Sewage Backup?

Last updated October 26, 2026

Call Now (360) 685-7801

The short answer

Safety First Steps

Before touching anything, shut off the electricity to affected rooms if water has reached outlets or appliances. Open windows for ventilation, and keep children and pets away. Wear rubber gloves, waterproof boots, and an N95 mask to avoid contact with harmful bacteria.

If you feel unwell during cleanup, see a doctor. Do not use household fans until the area is dry, as they can spread contaminants. Turn off the water supply to stop further backup if you can do so safely. Write down your shutoff valve location now, so you are ready.

  • Shut off power to wet areas
  • Open windows for air flow
  • Wear gloves, boots, and mask
  • Keep kids and pets out
  • Turn off water if possible

Remove Water and Solids

Use a wet vacuum or pump to remove standing water, but only if the area is safe. Scoop out solid waste with a shovel or heavy-duty bags, double-bagging everything. Do not mix sewage water with cleaning products, as that can create dangerous fumes.

After removing the bulk, discard any porous items that soaked up sewage: carpets, padding, upholstered furniture, drywall, and insulation. These cannot be safely cleaned. Hard surfaces like tile, concrete, and metal can be washed and disinfected. If the floor is wood, check for swelling or warping.

Disinfect All Surfaces

Mix a solution of one part bleach to ten parts water for hard surfaces. Scrub walls, floors, and fixtures thoroughly, then let the solution sit for at least ten minutes before rinsing. Pay attention to baseboards, door frames, and any cracks where moisture hides.

For surfaces that touch food, like kitchen counters, use a food-safe disinfectant after the bleach rinse. Wash all washable fabrics in hot water with disinfectant. If you have a mold concern from lingering dampness, a mold professional can assess the situation after the area is dry.

Dry the Area Thoroughly

After cleaning, dry everything completely to prevent mold growth. Use dehumidifiers and high-velocity air movers, which the pros often bring in for this purpose. Keep windows open if outdoor humidity is low, but in a mild marine climate with wet winters, indoor drying equipment matters more.

Check hidden spots like behind baseboards, under cabinets, and inside wall cavities. Moisture can linger there for days. If you have a basement, pay extra attention to low areas where water pools. A water damage inspection can find moisture you might miss with a simple touch test.

When to Bring in the Pros

Sewage cleanup is not a simple DIY task. The pros have industrial-grade equipment and know how to handle contaminated materials safely. They can also remove affected drywall and flooring properly, reducing the risk of structural damage and mold later.

If the backup covers a large area, involves the entire floor, or has soaked into walls, call local water damage pros. They will assess the extent, remove what needs removal, and disinfect with professional products. The cost depends on the size of the affected area and how far the sewage spread.

Policies vary, and your insurer decides what is covered. Check your policy to see if sewage backup is included, and document everything with photos for your records.

  • Large areas or whole floors
  • Water soaked into walls
  • Signs of mold or musty smell
  • You feel unsafe or overwhelmed

Talk to someone now

Phones are answered 24/7 for Bellingham and nearby communities.

Call Now (360) 685-7801

Frequently asked questions

Can I clean a small sewage backup myself?

A very small spill on a hard floor might be manageable, but any porous material exposure or uncertain safety calls for the pros. Sewage contains pathogens that can make you sick, so err on the side of caution. If in doubt, hire professional help.

What should I throw away after a sewage backup?

Throw away anything porous that touched sewage: carpets, padding, upholstered furniture, mattresses, drywall, and insulation. Cardboard boxes and paper products also go. Hard surfaces like tile, metal, and sealed concrete can be cleaned and kept. When in doubt, discard it.

How long does it take to dry after sewage cleanup?

Drying time depends on the extent of the water and the materials involved. Hard surfaces may dry in a day or two, but walls and subfloors can take several days with proper equipment. The pros use dehumidifiers and air movers to speed the process safely.

Call Now (360) 685-7801