Free referral · 24/7 · Portland
Water Damage Restoration in Portland, OR
In February 1996 the Willamette crested 10 feet above flood stage, held off downtown by a sandbag wall; older neighborhoods have combined sewers that can back up into basements. One call reaches vetted local water-damage pros, 24/7.
Active floods · Portland
No active flood events near Portland right now — see the live board.
Water damage in Portland is a rain story rather than a hurricane one: 42.9 inches of precipitation a year against just 2.8 inches of snow. The area carries 12 federally declared disasters, among them three floods and four severe storms — most recently the 2024 severe winter storms, straight-line winds, landslides, and mudslides. About one-third of the city's 2,500-plus miles of sewer pipe is more than 80 years old, so heavy rain tends to show up indoors as backups and basement seepage.
Water-damage risk in Portland
8
flood, hurricane & storm disasters declared in Multnomah County (FEMA)
2024
most recent flood/storm declaration: Severe Winter Storms, Straight-Line Winds, Landslides, and Mudslides (FEMA)
0"
rain forecast for Portland in the next 24 hours (NWS)
Sources: FEMA OpenFEMA — federally-declared disaster history (county FIPS 41051) · NOAA NCEI — 1991–2020 Climate Normals (PORTLAND KGW TV, OR US)
Why Portland homes flood
Two rivers set the terms: Portland sits where the Willamette meets the Columbia. But the flooding that repeats is smaller and inland. The Johnson Creek watershed drains about 54 square miles, roughly 40 percent of it inside the city, and its 100-year floodplain in the Lents and Powellhurst-Gilbert neighborhoods is under active remapping — new data from the Springwater Wetlands project may move properties into or out of the mapped zone when FEMA finalizes revised maps, possibly in 2026. The city also maintains a Composite February 1996 Flood Inundation Area map alongside the federal Special Flood Hazard Area, so a house can sit outside the FEMA zone and still carry a documented flood history.
Johnson Creek's largest documented flood came in 1964, and December 2015 produced the highest peak flow ever recorded on the creek. Federally declared disasters for the area total 12, among them three floods and four severe storms — most recently the 2024 severe winter storms, straight-line winds, landslides, and mudslides.
For a homeowner, mapped status is not the same as safe. A Class 5 Community Rating System standing earns a 25 percent flood insurance discount inside the 100-year floodplain, where a structure still faces at least a 25 percent chance of flooding across a 30-year mortgage. New residential construction there must be elevated two feet above base flood level, one foot in the Columbia River floodplain. Because rising water and plumbing failures are covered differently, identifying the source early shapes both the claim and the water damage restoration guide steps that follow.
Flood repair permits & inspections
Two permit tracks matter after flooding. Ordinary cosmetic repairs, such as replacing wallboard or sheet flooring, need no building permit in Portland, but repiping, rewiring, furnace replacement, and moving or removing walls each do. Inside a mapped flood hazard area, City Code Chapter 24.50 adds a second track: a development or building permit must be obtained before construction begins, and the Floodplain Administrator may require documentation verifying whether the job counts as substantial damage or substantial improvement. Crossing that 50 percent threshold pulls the whole structure up to current flood standards, including a lowest floor at or above the flood protection elevation.
| Permit / inspection | When it applies |
|---|---|
| Portland Permitting & Development — Development or Building Permit in a Flood Hazard Area | Required under City Code 24.50.060(A) before construction or development begins within any flood hazard area, covering structures, manufactured homes, and other development including fill. Applications are reviewed to confirm the site will be reasonably safe from flooding and must show the high hazard area boundary, top of bank, base flood elevation, design flood elevation, and the lowest floor elevation of each structure. |
| Substantial Damage / Substantial Improvement Determination (City Code 24.50.030) | City Code defines substantial damage as damage of any origin where restoring a structure to its pre-damaged condition would cost 50 percent or more of its market value before the damage. Substantial improvement applies the same threshold to repair, reconstruction, or improvement, measured from the first alteration of a wall, ceiling, floor, or other structural part. Where a structure sits only partly in a flood hazard area, the entire structure is subject to the requirements. |
| Flood Protection Elevation compliance and FEMA Elevation Certificate | New construction and substantial improvement of a residential structure must have the lowest floor, including basement, elevated to or above the flood protection elevation. Elevations must be certified on a FEMA Elevation Certificate prepared by a licensed surveyor or engineer, secured by the permittee, and made part of the permit record. This is the requirement that turns a large repair job into an elevation project. |
| Residential Plumbing Permit | Required to repair, replace, relocate, or add to piping, and to set fixtures such as water heaters, toilets, and sinks — routine once saturated walls are opened. Fixing or maintaining existing fixtures or parts is exempt. Two inspections apply: a rough-in before piping is concealed, and a final to close the permit. Permits expire if more than 180 days pass between inspections. |
| Residential Building Permit — structural alterations | Replacing an interior wall, floor, or ceiling covering such as wallboard or sheet vinyl is exempt from a building permit, as is reroofing with material of similar weight, so most drywall-and-flooring dry-out work proceeds without one. A permit is required to move, remove, or add walls. Exempt work must still meet Building and Zoning Code requirements. |
| Electrical and Mechanical Trade Permits | Separate trade permits are issued for work such as replacing a service panel or replacing a furnace — both common where water reaches a basement or crawl space. Applications go through Development Hub PDX or the Development Services Center at 1900 SW 4th Ave. |
Floodplain & drainage ordinances
- City Code 24.50.050 — Flood Hazard Areas and Flood Protection Elevations
- Sets the height a rebuilt lowest floor must reach, and it varies by waterway: base flood elevation plus 1 foot along the Columbia River in Zone AE, plus 2 feet along the Willamette and along Johnson, Fanno, and Crystal Springs creeks. Where a structure spans more than one flood zone, the more restrictive elevation applies, so a repair that triggers compliance can require raising the floor rather than restoring it where it sat.
- Ordinance 192083 — Flood Hazard Areas Code amendments for FEMA Pre-Implementation Compliance Measures
- Adopted July 17, 2025 and effective July 31, 2025, this amendment brought the flood hazard chapter in line with FEMA's Pre-Implementation Compliance Measures. Qualifying floodplain development must compensate for lost flood storage volume through excavation of soil or rock or removal of structures that displace floodwater, meet the Stormwater Management Manual's standards, and replace removed trees at ratios ranging from three to six for every tree taken, depending on size and location.
- City Code 17.38.040 — Stormwater Management Required
- Stormwater duties attach to work that creates or replaces impervious area, not only to new construction. Replacing a damaged roof, driveway, or patio slab beyond the threshold set in the Stormwater Management Manual can pull a repair into retention, pollution reduction, and flow and volume control requirements, and the runoff must then be managed as close to the site as practicable rather than simply piped off the lot.
- City Code 17.38.030 — Protection of Drainageway Areas
- Where a natural drainageway crosses a lot, a drainage reserve can be required and must be kept free of encroachments: structures, culverts, excavations, and fills are all barred unless the City Administrator authorizes them. Regrading or filling a swale after flooding therefore needs approval first, and the reserve does not relieve the owner of the separate responsibility to manage stormwater.
- City Code Title 10, Chapter 10.30 — Erosion and Sediment Control Requirements
- These rules reach all ground disturbing activities whether or not a permit is required, so trenching a french drain, regrading a yard, or excavating along a foundation falls under them. No visible or measurable sediment or pollutant may exit the site, enter the public right-of-way, or reach a water body or storm drainage system, and control measures must be maintained in proper functioning order.
Local water-damage notes
- Free sand and sandbag distribution — Lents Park and Gabriel Park — The Bureau of Transportation stocks two self-serve sand piles ahead of storms, and sand and sandbags are free to anyone who needs them to protect property from flood damage. The sites are the Lents Park parking lot at SE 88th Avenue just south of Holgate Boulevard, and the Gabriel Park parking lot at SW 42nd Avenue and Vermont Street. No shovels are kept on site, so residents must bring their own — a detail worth knowing before a driving rain rather than during one.
- Johnson Creek Willing Seller Program and the Foster Floodplain Natural Area — Rather than rebuild repeatedly flooded homes along Johnson Creek, the city bought them. Over more than 15 years the Willing Seller Acquisition Program purchased land from 60 families and helped them move out of the 100-year floodplain, producing the 63-acre Foster Floodplain Natural Area in Lents. The restored floodplain adds 140 acre-feet of flood storage — enough to cover the site with about a foot and a half of water — and cut flooding on Foster Road from roughly every other year to about every 6 to 8 years. Homes remaining nearby sit in a corridor with a documented buyout history.
- Downspout Disconnection Program — roof drains routed off the combined sewer — In neighborhoods east of the Willamette River, where soils and topography make it safe, the city partnered with residents to disconnect roof drains from combined sewers and redirect the flow to yards and gardens. More than 56,000 disconnections now keep 1.2 billion gallons of stormwater per year out of combined sewers. The practical consequence for older east-side houses is that roof runoff often discharges at grade near the foundation, so a disconnected downspout with a short or displaced extension becomes a recurring source of basement and crawl-space moisture.
- Big Pipe Project — combined sewer overflow storage — A 20-year, $1.4 billion ratepayer investment completed in 2011 built tunnels that store up to 119 million gallons of combined sewage and stormwater during rain. Combined sewer overflows to the Willamette River fell by 94 percent and to the Columbia Slough by 99 percent; the annual average of 50 overflows to the Willamette dropped to about four per rainy season and one every third summer. Sewer backups in basements served by the combined system are far less common than before 2011, but the system is sized for storage rather than elimination, so overflow conditions still occur in heavy rain.
Cleanup & recovery services nearby
- Metro Central Household Hazardous Waste Facility — Regional drop-off at 6161 NW 61st Ave. for paint, solvents, cleaning products, pool chemicals, batteries and double-bagged asbestos-containing materials pulled out during a cleanout — free for households with a 35-gallon daily limit, Monday through Saturday, 9 a.m. to 4 p.m.
- Portland Disposal & Recycling, Inc. — Family-operated hauler since 1936 renting roll-off drop boxes in 10-, 15-, 20-, 30- and 40-yard sizes — the container that soaked drywall, carpet pad and subfloor leave in.
- Recology Portland — Roll-off drop boxes in 10, 20, 30 and 40 cubic yards, open or closed, for residential and commercial customers inside the city limits — wood, concrete, furniture and demolition debris.
- Town & Country Glass Services — Glass shop on NE Halsey St. that boards up broken windows and doors after storm and weather damage, holding the opening until replacement glazing goes in.
- Urban Timber Tree Service Inc. — ISA-certified arborists on SE Harold St. (CCB #212995) removing limbs and uprooted trees off houses, cars and power lines after wind and saturated-soil failures, plus stump grinding.
- Broadway Storage PDX — Temperature- and humidity-controlled self-storage at 228 NE Broadway with keyless fob entry — somewhere dry to park furniture and boxed contents while drying equipment and repairs run.
By the numbers
- Willamette River peak stage, February 1996 flood — The highest stage recorded during the February 1996 flood, per the NWS Northwest River Forecast Center.
- 28.6 ft
- People left homeless by the 1948 Vanport flood — The flooding Columbia River undermined a railroad embankment and dike, destroying the city of Vanport on Memorial Day 1948.
- 18,500