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Water Damage Restoration in Seattle, WA
Flooding accounts for 17 of King County's 35 federal disaster declarations, and a March 2026 atmospheric river pushed the Snoqualmie, Tolt, White, Cedar, South Fork Skykomish and Green rivers into flood alert phases. One call reaches vetted local water-damage pros, 24/7.
Active floods · Seattle
No active flood events near Seattle right now — see the live board.
Water damage in Seattle tracks a long, wet rainy season rather than tropical storms: 37.7 inches of precipitation a year against 5 inches of snow. Federal disaster declarations for severe storms, flooding, landslides and mudslides came in three consecutive years — 2024, 2025 and 2026. The city's floodplain development rules took effect August 23, 2020, after FEMA finalized new flood insurance rate maps covering the county on February 19, 2020.
Water-damage risk in Seattle
29
flood, hurricane & storm disasters declared in King County (FEMA)
2026
most recent flood/storm declaration: Severe Storms, Straight-Line Winds, Flooding, Landslides, and Mudslides (FEMA)
0"
rain forecast for Seattle in the next 24 hours (NWS)
Sources: FEMA OpenFEMA — federally-declared disaster history (county FIPS 53033) · NOAA NCEI — 1991–2020 Climate Normals (SEATTLE PORTAGE BAY, WA US)
Why Seattle homes flood
The city's hazard analysis names three flood mechanisms — riverine, coastal, and urban — and identifies urban and riverine as the most common. The mapped 100-year floodplain is narrow, covering the South Park neighborhood and the drainage basins of Thornton and Longfellow Creeks. Much of the damage falls outside it: low-lying, bowl-shaped areas such as Madison Valley and Midvale flood when intense rain overwhelms drainage capacity, not when a river crests.
South Park sits low along the Duwamish, a tidal river that rises with the high tide, so heavy rain landing on a high tide pushes water back through the pipes that normally drain the neighborhood; coastal flooding has reached the area when winter storms coincide with king tides. The record favors short, intense events: 2.17 inches of rain on December 14–15, 2006 left roughly 300 flooded homes and six landslides, and December 1–3, 2007 brought 4.5 to 5.5 inches in 24 hours, an all-time record.
For a homeowner, the practical consequence is timing. Water usually arrives as runoff or a drainage backup during a storm, without the river-gauge warning eastern King County valleys get, soaking framing and drywall before anyone reacts. Identifying the source — surface runoff, tidal backup, or a failed drain — shapes both the insurance claim and the drying plan; the water damage restoration guide outlines that sequence.
Flood repair permits & inspections
Flood repair permits in Seattle are issued by the city rather than King County: the Seattle Department of Construction and Inspections reviews work inside the mapped 100-year floodplain, which covers ground along Thornton, Pipers and Longfellow creeks, the South Park area along the Duwamish Waterway, and the Puget Sound coastline. Work that already needs a building, electrical, or grading permit receives floodplain review automatically as a component of that permit, with no separate application, though an added fee applies. Standalone floodplain work instead needs a Floodplain Development License. Repair or improvement reaching 50 percent of a structure's market value counts as substantial improvement and triggers elevation requirements.
| Permit / inspection | When it applies |
|---|---|
| SDCI Floodplain Development License | Required before construction or development on private property in a designated floodplain when the work needs no other permit — examples include pouring a concrete slab on grade or driveway, grading of any type or amount, installing playground equipment, or removing a fence under 8 feet in height. Where a building, electrical, or grading permit is already required, floodplain review is handled automatically as a component of that permit, with no separate application but an additional fee. |
| Construction Permit — Subject-to-Field-Inspection (STFI) | Covers smaller repair projects that do not carry full plan-review requirements, including remodeling a portion of a house, foundation repairs, and interior non-structural alterations to existing commercial space. The building inspector reviews code requirements on site during construction rather than through upfront plans. Projects disturbing more than 750 square feet of land, or requiring a topographic survey or geotechnical report in an environmentally critical area, need an Addition or Alteration permit instead. |
| Substantial Improvement Review — Floodplain Development Ordinance (SMC 25.06) | Applies when repairs or improvements reach 50 percent or greater of a structure's market value. The lowest floor of a residential structure must then be elevated to 2 feet above the 100-year flood level; non-residential structures must be elevated or flood proofed to the same level. All development is prohibited within the floodway under SMC 25.09.120 A, and a drainage-control plan is required for all proposed development within a designated floodplain area. |
| Elevation Certificate | Required where a floodplain structure is newly constructed or substantially improved. An elevation survey prepared by a licensed surveyor must show base flood elevations, the elevation of the lowest floor including basement, and the elevation to which the structure is or will be flood proofed. Flood-proofed non-residential buildings need a separate flood proofing certificate. The certificate supports proper flood insurance rating and Letter of Map Amendment requests. |
| Electrical Permit | Required any time electrical wiring is installed, altered, extended, or connected to electrical equipment — the usual trigger when submerged circuits, panels, or outlets are replaced after water intrusion. Most permits require three electrical inspections: cover, service, and final. Inspections must be scheduled before the permit expires. Most low-voltage systems in single-family homes are exempt from permit requirements, with the exception of security alarm systems. |
Floodplain & drainage ordinances
- Floodplain Development Ordinance — Seattle Municipal Code Chapter 25.06
- Adopted in 1989 and revised in 2004, this ordinance governs the mapped 100-year floodplain along Thornton, Pipers and Longfellow Creeks, the South Park area along the Duwamish Waterway, and the Puget Sound coastline. Repair work that qualifies as substantial improvement — 50 percent or greater of the structure's market value — must elevate a residential lowest floor to 2 feet above the 100-year flood level, and a drainage control plan is required for all proposed development in a designated floodplain area.
- Environmentally Critical Areas Code — Seattle Municipal Code Chapter 25.09
- Flood-prone areas are regulated as environmentally critical areas alongside landslide-prone and steep-slope areas, so a waterlogged property may sit under two overlapping code chapters at once. All development is prohibited within the floodway under SMC 25.09.120.A, and repairs in a critical area that is also a mapped floodplain may draw additional permits and must satisfy the standards of both chapters.
- Stormwater Code — Seattle Municipal Code Title 22, Subtitle VIII (Chapters 22.800–22.808)
- Drainage review attaches once a project replaces or adds more than 750 square feet of hard surface such as pavement, replaces or adds more than 750 square feet of building measured at the roof outline, disturbs more than 5,000 square feet of land, or requires a grading permit. A reroof or slab replacement after flood damage can cross those thresholds and pull on-site stormwater management requirements into an otherwise routine repair.
- Floodplain Development Regulations Update — interim regulations effective August 23, 2020
- FEMA finalized a new Flood Insurance Rate Map and Flood Insurance Study for King County on February 19, 2020, and the city's interim floodplain development regulations and new maps took effect on August 23, 2020. The updated Chapter 25.06 rules must comply with National Flood Insurance Program standards at 44 CFR Section 60.3(d) and (e), so a property outside the old flood maps may now fall inside a regulated flood hazard area.
Local water-damage notes
- Seasonal sandbag distribution — Seattle Public Utilities — Seattle Public Utilities offers filled sandbags to homes and businesses in flood-prone areas only, from October 15 to March 15, up to 25 bags per address while supplies last. Self-serve pickup stations have included the South Park neighborhood at 731 S. Sullivan, Southwest Pool at 2801 SW Thistle Street, Helene Madison Pool at 13401 Meridian N, and Meadowbrook Community Center at 10517 35th Ave. NE. The utility states that sandbags do not seal out water but redirect stormwater flow and hold back debris, and that each filled bag weighs about 40 pounds.
- Side sewer ownership — Seattle Municipal Code Chapter 21.16 — The property owner owns and maintains the entire side sewer, from the building all the way to the connection at the public main in the street; the utility maintains only the main itself. A side sewer stays private property even where it runs past the property line. Where a pipe is shared with neighboring properties before it reaches the main, all owners sharing it are equally responsible for maintenance and repair. That ownership line determines who pays when a failed lateral backs sewage into a basement, which is often the first question after a backup.
- South Park Pump Station — South Park, in the Duwamish valley, is a chronic trouble spot: during king tides the storm drain system cannot drain by gravity, and a late-December 2022 event left basements under water and caused sewer backups across the neighborhood, with one homeowner reporting an estimated $60,000 in water damage. The pump station now sends stormwater to the Duwamish Waterway at up to 32,000 gallons per minute, paired with roughly 1.5 miles of new underground storm drain serving about 17,000 residents and 450 businesses.
- RainWise rebates — A joint program of the city utility and King County Wastewater Treatment Division, RainWise covers most or all of the cost of installing cisterns and rain gardens on private property to keep roof runoff out of the combined sewer. Eligibility is limited to properties inside targeted combined sewer overflow basins, verified by address on the program's eligibility map, and the work must be done by a RainWise-trained contractor to qualify. The average rebate is about $4,740.
Cleanup & recovery services nearby
- NW Dumpsters — Locally owned, minority-owned roll-off rental — 20-, 30- and 40-yard containers plus lidded units and a 10-yard rock box for concrete, delivered seven days a week for demolition and cleanout debris.
- Big Mike's Recycle — Ballard-based waste hauler operating since 2020 — 10- and 20-yard dumpsters, junk removal and curbside bulk collection with LEED-certified disposal for gut-out debris.
- Seattle Tree Care — Arborist firm working the area and the Eastside since 2007 — a team of 12 ISA Certified Arborists on call around the clock for storm-damage cleanup, hazardous removals and root-zone excavation.
- Ballard Tree Service — Family-run tree service since 1990 with three ISA Certified Arborists — 24-hour emergency line for fallen trees, plus pruning, planting and stump grinding.
- Seattle Sodo Storage (The H.O. Seiffert Company) — Fourth-generation family business founded in 1901 and in storage since 1987 — climate-controlled units among more than 1,500 across three locations, for household contents pulled out during repairs.
- ACE Glass LLC — Glass and window shop with 24/7 emergency board-up — plywood over openings broken by storms, accidents or vandalism to keep rain and intruders out until glass is replaced.
By the numbers
- King County Flood Control District 2026 budget — Funds the countywide flood protection program for the 2026 budget year.
- $114.1M
- Miles of levees and revetments maintained by the flood district — Protected by more than 500 flood protection facilities the district inspects and maintains.
- 119
- Major river systems in the flood control district — The South Fork Skykomish, Snoqualmie, Sammamish, Cedar, Green and White Rivers, plus several tributaries.
- 6
- Median year city buildings were built — Older than the Washington median of 1978 and the national median of 1968; about 23 percent of housing units date to 1939 or earlier.
- 1956