Homes With Basements in King County
The King County Assessor shows basements on 41.5 percent of residential buildings in that part of Bothell, so storm sewage can reach rooms below grade.
Bothell, WA Sewer Backup After Heavy Rain
One call for a rain-season backup, with a written estimate after inspection.
Country Village Sewage Cleanup
A sewer backup after heavy rain in Bothell brings sewage up through your drains. November is the wettest month at 5.85 inches in NOAA normals for Seattle Sand Point. Your restoration company inspects, sets the water category, and records where the water entered, so ask how it documents the source when you call.
Bothell Callers This Page Serves
Bothell callers during a rain-season backup fall into 4 groups, and each has its own local trigger.
Homes Near Thrasher's Corner
The Bothell Reporter says wastewater backed up into 2 homes near Thrasher's Corner during the North Creek Interceptor spills of 2012 and 2013.
Low Spots Along North Creek
The City says minor flooding recurs in low spots along North Creek, so you want the water source named before you file a claim.
Owners Without the Endorsement
The Washington Office of the Insurance Commissioner (OIC) calls sewer backup an optional endorsement, so you check your policy pages before repairs begin.
Inside a Standard Sewage Cleanup
A standard sewage cleanup after a Bothell storm has 7 parts, and sewage cleanup and sanitizing covers the core process in depth.
- 1Trace whether sewage, outside water, or both came in, since Snohomish County warns that floodwater can contain sewage.
- 2Set the water category by inspection, the step the ANSI/IICRC S500 calls the preliminary determination.
- 3Place contamination controls before drying starts, the order the S500 gives for Category 2 or 3 water.
- 4Remove saturated carpet and pad, as Washington Department of Health describes for sewage spills.
- 5Clean and sanitize the hard surfaces the sewage touched, then check the result by inspection.
- 6Dry the structure and follow it with moisture readings against stated drying goals.
- 7Hand you photos, readings, and receipts, since OIC says to have receipts and photos ready for a claim.
Extras include contents cleaning, rebuild work, and sewage-damaged drywall and flooring removal past the first scope. Line work belongs to a plumber or your sewer provider.
Local Backup Sources and What Your Restoration Company Does
These 4 rain-season cases in Bothell each change what your restoration company does first.
| Backup situation | What your restoration company does |
|---|---|
| Sewage at the lowest drain during a November storm | Your restoration company finds the entry point, then places controls. See basement floor drain backup for the Standard Detail 608 case. |
| Storm sewage in a finished room below grade | Your restoration company scopes the room under basement sewage cleanup, since 36.6 percent of King County side residential buildings have finished basements. |
| Outside water and sewage together near North Creek | Your restoration company photographs and logs both water sources, because your insurer reads flood and sewer backup under different wording. |
| Toilet, tub, and floor drain rising at once | Your restoration company plans cleanup around the line work in a main sewer line backup, which a plumber or your provider handles. |
What Follows Your Call
Your call starts these 4 steps, from the storm details to a documented cleanup.
- 1
Call With the Storm Details
You call and describe where sewage came in and when the rain began. You then talk with a local restoration company about your home.
- 2
Report the Backup to Your Provider
You phone your sewer provider. City of Bothell customers call Public Works at 425-488-0118 on weekdays from 7 am to 3:30 pm, or Police non-emergency at 425-577-5656 after hours.
- 3
Inspect and Set the Scope
Your restoration company inspects, measures the wet area, and sets the category. You get a written estimate after that inspection.
- 4
Clean, Sanitize, and Dry
Your restoration company places controls, cleans, sanitizes, and dries. You keep the photos and moisture readings that separate sewage from outside water.
What Sets the Price of a Rain-Season Backup
The price of a rain-season backup rests on 4 factors your restoration company measures, and sewage cleanup cost factors explains the method. We found no verified dollar range for Bothell, so this page lists factors only.
Water Sources
Your restoration company records whether sewage came alone or with outside water, since the scope then covers both.
Wet Area
Your restoration company measures the wet area in square feet, room by room, including finished space below grade.
Materials Removed
Your restoration company counts saturated carpet, pad, and soft plasterboard, the materials Washington agencies name for removal.
Drying Checks
Your restoration company logs moisture readings until materials meet the drying goal, and each added check shows on the estimate.
Sewage Safety and Code Requirements
Sewage safety and code requirements after a storm begin with Washington's Uniform Plumbing Code (UPC). UPC 710.1, 2021 edition, stays in force until the 2024 state codes take effect on May 3, 2027. It calls for a backwater valve when fixtures sit on a floor lower than the next upstream manhole cover.
Washington L&I limits plumbing on someone else's property to plumbers with its certification, so a plumber handles any valve. Bothell's Permit Center takes applications online only through MyBuildingPermit, and Washington L&I issues electrical permits inside the city. Ask your restoration company which storm repairs go to each office.
Sewer Backup Coverage in Washington
Sewer backup coverage in Washington takes an optional endorsement, since OIC says a standard home policy leaves it out. OIC also warns that a policy can carry a water damage sublimit, so check yours. Read the sewage backup questions, and ask your restoration company which storm photos your adjuster asks for.
Federal flood policy text limits basement coverage to listed items. OIC says insurance does not cover water damage when you delay repairs, stated about a storm or accident. Ask your restoration company what it documents on the first visit.
Flood or Sewer Backup: Which Insurance Wording Fits Your Rain Damage?
Flood and sewer backup sit under separate insurance wording: OIC says a standard home policy excludes flood and treats sewer backup as an optional endorsement. Federal flood text excludes drain backup unless a flood in the area is the proximate cause. Your restoration company records where water came in, so ask for those photos when you call.
Who Runs the Sewer at Your Bothell Address During a Storm?
The public sewer at your Bothell address belongs to 1 of 4 providers on the City's October 26, 2026 map: Alderwood, Bothell, Northshore, or Woodinville. King County runs the regional North Creek Interceptor and treats the wastewater. Tell your restoration company which provider took your report, so its records match yours.
Would a Backwater Valve Help a Bothell Home in Heavy Rain?
Yes, for a home with fixtures below the next upstream manhole cover, since UPC 710.1 calls for a backwater valve. Bothell's Public Works Director can require a flapper, swing valve, or other approved device where backup is reasonably possible, and neither rule measures valve results. We found no cost-share program for the City or any provider, so ask a plumber about the valve and your restoration company about cleanup.
What Is Different in Bothell
- NOAA 1991 to 2020 normals at Seattle Sand Point show 37.82 inches a year. The City names the county line as a preferred spot for Puget Sound Convergence Zone rain, so ask which side your home sits on.
- Ecology fined King County $22,000 for 11 North Creek Interceptor spills, November 2012 to January 2013, per the Bothell Reporter and HeraldNet. Alderwood serves both Canyon Park and Thrasher's Corner.
- The Bothell Reporter covered rain-linked manhole overflows on that line in 2014, 2015, and 2016. King County lists about 2 miles of replacement as complete in Spring 2019.
- We found no combined sewer serving Bothell and no published surcharge event inside Bothell's own sewers. King County built North Creek Storage to reduce overflows in Bothell and Kenmore.
- The City puts 6.10 percent of its land in Special Flood Hazard Areas and dates its latest significant flood to December 1 to 17, 2007. We found no source tying a Bothell sewer backup to DR-4906, the December 2025 disaster covering both counties.
What Bothell Callers Want to Know
Is a Sewer Backup After Rain the City's Fault?
No, a sewer backup after rain does not by itself point to the City. King County says most spills start in a building's private side sewer, and the City puts cleanup on the owner in most cases. Ask your provider where the blockage sat, and give that answer to your restoration company.
Does Bothell Have Combined Sewers That Overflow in Storms?
No combined sewer serving Bothell was found, and Ecology's list of 11 permitted communities leaves out Bothell, Alderwood, Northshore, and Woodinville Water District. King County, which treats their wastewater, is listed, and it ties its combined sewer facilities to older parts of Seattle. Your restoration company looks for the entry point at your address instead of assuming a citywide cause.
Is It Sewer Surcharge or Outside Water in My Bothell Home?
The entry point separates a sewer surcharge in Bothell from outside water, and your restoration company traces it. Water at drains and low fixtures points first to the sewer, and water at walls and doorways points first outside. The City says flood waters can also back up in sewer drains, so ask for each entry point on the written scope.
How Do I Check a Company After a Sewage Backup During a Storm in Bothell?
You check the company on the Washington L&I Verify tool before cleanup starts. Washington requires construction contractors to register, and the L&I application lists a specialty for fire or water damage clean-up. On the call, ask which L&I registration number the company holds.
Related Sewage Services
Find which provider to phone, what the side sewer rule says, and where line work ends and cleanup begins.
See why the lowest drain shows sewage first, which trade comes first, and what Bothell's valve rule says.
The Category 3 order of work, the question of cleaning it yourself, and what your restoration company checks.
The facts on this page come from 45 public documents, among them records from IICRC, Washington State Department of Health, and Public Health - Seattle & King County. The how we check sewage facts page lists each one with its check date.
One Phone Call for a Bothell Sewer Backup
Call to ask a local water damage restoration company about extracting the water in your Bothell home.
(425) 548-1472