Flood and Sewage Damage Cleanup in Portland, OR: Sewer Backups, Floodwater, and Contaminated Water

What makes water Category 3

Restoration standards sort water losses into three categories by contamination. A university guideline that follows the IICRC definitions describes Category 3 as grossly unsanitary water. It lists sewage, flooding from rivers or streams, and toilet backflows from beyond the trap as examples. The same guideline notes that Category 2 water left untreated for more than 48 hours may change to Category 3.

That classification changes the work. A clean-water loss is a drying job. A Category 3 loss is a removal and cleaning job, because the EPA's cleanup table is written for damage caused by clean water. Categories 1 and 2, and the drying process, are on the water damage page.

A flooded house and a sewage backup have the same Category but different sources. A backup is local and comes from a pipe. A flood is regional and comes from outside. The cleanup is similar; the responsibility, the insurance, and the timeline are not.

When to treat water as Category 3

When in doubt, treat the water as contaminated until a professional says otherwise.

• Sewage came up through a floor drain, tub, shower, or toilet.
• River, creek, or storm water entered the house or crawl space.
• A toilet overflowed with waste beyond the bowl.
• Water was standing in a basement or crawl space and has an odor.
• A sump pump failed during a storm and groundwater entered.
• Clean water sat for days and now smells, feels slimy, or has visible growth.
• You do not know where the water came from.

What to do in the first hours after a sewer backup

The order follows the City of Portland's guidance and the CDC's safety guidance.

1. 1

   Stay out and keep others out

   The City says bacteria in sewage is a health hazard and to avoid contact with sewage or material contaminated by it. Keep others out of the affected area.

2. 2

   Call a plumber first

   The City of Portland's guidance for a backup in a home or business is to call a plumber first to investigate the cause. A plumber can tell whether the problem is in your line or in the City's.

3. 3

   Protect yourself if you must enter

   The City advises gloves, boots, rain gear, and other protective clothing, and to keep sewage away from the face and eyes. The CDC says to wear rubber boots, rubber gloves, and goggles if sewage is involved, and for general cleanup it recommends heavy work gloves, N95 masks, and waterproof boots. Wash any wound that touches sewage right away.

4. 4

   Photograph before you move anything

   The FEMA flood policy summary says to take pictures or videos of damaged property before removing it. A dated record helps with any claim.

5. 5

   Call a cleanup company

   The City notes that there are companies that specialize in cleaning and restoration after a sewer backup or water damage. A contractor documents the area, extracts the water, removes contaminated materials, cleans, disinfects, and dries.

6. 6

   Start drying early

   The CDC advises cleaning up and drying the home within 24 to 48 hours if possible. The Oregon Health Authority says to dry it out as soon as possible and, if the house was flooded and closed up for several days, to presume it has been contaminated with mold.

7. 7

   Do not run the furnace or fans in a contaminated house

   The Oregon Health Authority says the HVAC system must be checked and cleaned by a professional before you turn it on after a flood, and the EPA table says not to use fans before the water is known to be clean.

What gets thrown away and what gets cleaned

The CDC's guidance is direct. Throw away items that cannot be cleaned or dried quickly, such as mattresses, carpeting, rugs, upholstered furniture, pillows, books, and paper products. Remove and discard drywall and insulation that has been contaminated with sewage or floodwater.

Hard, non-porous surfaces are cleaned and disinfected. The CDC says to thoroughly clean all wet items and surfaces with hot water and laundry or dish detergent, and lists flooring, concrete, countertops, appliances, and sinks as examples. The City of Portland's backup guidance says to wash all surfaces with hot, soapy water, then disinfect with a solution of one part household bleach to ten parts water, wash hands thoroughly, and wash and disinfect the clothing and supplies used. Never mix bleach with ammonia or other cleaners, and the CDC says never to use bleach in a closed space.

Framing is the hard case. Studs and sill plates can be cleaned, disinfected, and dried, but only after the wet drywall and insulation are out so that the wood can be reached. The standards for drying wood, and the moisture readings that show it is done, are on the water damage page. If mold has started, see the remediation page.

The CDC's rule of thumb is about speed and feasibility: if a porous item cannot be cleaned or dried quickly, it goes.

Sewer backups in Portland: who is responsible?

The City of Portland's guidance divides the question by where the problem is. If the plumber finds a problem in the line from your home to the street, the repair is the property owner's responsibility. If the plumber determines the problem is in the City sewer line, the repair is the City's responsibility. The first call is therefore to a plumber, who can scope the line with a camera and say which section failed. Keep the plumber's report and photographs.

The City's 24-hour line for sewer odor or an emergency is 503-823-1700. If you believe a backup of the City's sewer system damaged your property and want to file a claim, the City says to call its Risk Management group, which lists 503-823-5101 for liability claims. Confirm numbers on the City's page before calling.

A backwater valve is a one-way valve in a home's drain line that lets wastewater out and closes to help keep sewage from coming back in. The City runs a Sewer Backflow Prevention Program that helps pay for installing one, and its page lists 503-823-5366 for the program. The City notes that a property owner who participates takes responsibility for any future sewer backups at that address, so read the terms before enrolling.

Homes with a basement or lower floor below the street are the ones that backups usually reach, because sewage rises to the lowest drain. A plumber can tell you whether a valve is installed and working.

Floodwater: what is different

A flood brings outside water, silt, and whatever it carried. The Oregon Health Authority says to wear goggles, gloves, an N95 respirator, and clothing that covers the skin, and Oregon Emergency Management advises photographing damage to buildings and contents, saving receipts, and checking crawl spaces and basements for wet insulation. Oregon Emergency Management also advises consulting the local floodplain administrator and building official about permits before repairs, and verifying contractor licenses.

Do not assume water in a crawl space is harmless because it is not in the living area. Wet insulation, ducts, and framing there are part of the loss. The crawl space page explains how the space is handled, and the gutters and drainage page covers the storm water that reaches foundations.

Wells and septic systems add steps for rural properties around the metro area. Contact your county health department or the Oregon Department of Environmental Quality about a flooded well or septic system before using the water or the system.

Insurance: flood, sewer backup, and what is excluded

Flood and sewer backup are two different coverages, and each is usually separate from a standard homeowners policy. The NAIC consumer guide says you might be able to buy endorsements to cover sewer or drain backups and sump pump overflow, since most homeowners policies offer limited or no coverage for these events. The general patterns for water, mold, and claims are in Does Homeowners Insurance Cover Mold in Oregon?.

FEMA's National Flood Insurance Program publishes a summary of coverage. It says flood insurance is a separate policy, that there is limited coverage in a basement, that you should report your loss immediately to your insurance company or agent, and that you should take pictures or videos of damaged property before removing it. It also lists examples of excluded losses, including damage caused by moisture, mildew, or mold that could have been avoided by the property owner, and it points to the exclusions section for damage caused by seepage or drain or sewer backup. A published FEMA appeal decision upheld that mold exclusion where mold was found five months after the flood, citing the policyholder's failure to inspect and maintain the property after the water receded. FloodSmart materials say a new policy usually has a 30-day waiting period before it takes effect, with exceptions, so this is a coverage to arrange before the wet season, not during a storm.

Your own policy decides. Ask your agent three questions: does the policy include water backup coverage and at what limit, is flood coverage in place, and what documentation does the insurer need. Cost drivers and the sudden-versus-gradual pattern are on the water damage page, and the mold-specific limits are on the remediation page.

What affects the price of flood and sewage cleanup

Category 3 work costs more than drying alone because of protective measures and disposal.

• Area and depth How many rooms and how high the water rose determine what is removed.
• Materials affected Carpet, pad, drywall, insulation, and cabinets are removed; framing is cleaned.
• Time since the event Water that has sat for days spreads further and invites mold.
• Protective measures Contained work areas, protective gear, and disposal of contaminated material add labor.
• Drying equipment Equipment days depend on the materials left in place.
• HVAC and ducts If air handling equipment was wet, it needs professional cleaning or replacement.
• Access Crawl spaces and basements with low clearance add time.
• Plumbing repair and rebuild The sewer line repair and the finishing are separate trades.

Questions to ask a sewage or flood cleanup contractor

These test whether a quote reflects contaminated-water work.

1. How do you classify the water, and what protective measures does that require?
2. Which materials will you remove, and why?
3. How do you contain the work area and protect the rest of the house?
4. How is contaminated material disposed of?
5. Will you document the work with photographs and readings?
6. What happens to the ducts and the furnace?
7. Who handles the plumber and the rebuild?
8. Do you hold a Construction Contractors Board license? (Check it on the CCB site.)

Frequently asked questions

Sources

• City of Portland, What to Do After a Sewer Backup
• CDC, Guidelines for Cleaning Safely After a Disaster
• Northern Arizona University, Water Damage Restoration Guideline (adopts IICRC category definitions)
• FEMA FloodSmart, Flood Insurance 101 (waiting period)
• U.S. EPA, Mold Remediation in Schools and Commercial Buildings, Table 1 (clean-water note)
• Oregon Health Authority, Home safety and re-entry after a flood
• Oregon Emergency Management, Tips for Flood Recovery
• FEMA, National Flood Insurance Program Summary of Coverage (December 2023)
• FEMA FloodSmart, Mold, mildew and moisture exclusion decision upheld
• NAIC, A Consumer's Guide to Home Insurance
• National Association of Insurance Commissioners, Homeowners Insurance consumer page
• Oregon Division of Financial Regulation, news release on home and property insurance

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