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Skagit County, Washington
A shallow water table limits basements on 46% of Skagit County's mapped land, a higher share than 63% of US counties and the 5th highest of 39 Washington counties. Shrink-swell clay limits houses without basements on under 1%.
The soil survey maps 72% of the county's land area; these shares describe the mapped part. 89.7% of the county is in drought on the October 13, 2026 Drought Monitor map. FEMA's flood data list 235 flood losses here since 2016, 13% of them in buildings with basements. 42% of homes were built before 1980, against 50% nationally; the median home dates from 1986.
Data as of October 13, 2026 · sources
expansive clay: shrink-swell limits slab homes
high water table: limits basements
in drought, October 13, 2026
of homes built before 1980
Soil under Skagit County
| Expansive clay (limits slab homes) | 0.4% |
| High water table (limits basements) | 45.8% |
| Septic fields very limited | 94.1% |
| Clay swell (LEP, by area) | 1.6% |
| High-swell land (LEP 6%+) | 0.4% |
| Mapped soil | 798,459 acres |
| Soil series | Share here | Series nationally: high water table |
|---|---|---|
| Vanzandt | 4% | n/a |
| Skagit | 3% | n/a |
| Kindy | 3% | n/a |
| Barneston | 3% | n/a |
| Montborne | 3% | n/a |
| Wollard | 3% | n/a |
How we count · survey areas WA657 (2025-08-28), WA749 (2025-08-28), WA774 (2025-08-28)
What the numbers mean here
On 46% of Skagit County's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
Rain over the 12 months to August 2026: 83.46 in, 3.51 in above the 1991-2020 average year of 79.95 in.
USDA rates 94% of the land very limited for septic absorption fields.
Drought
89.7% of the county is in drought (D1 or worse) on the October 13, 2026 map. Part of the county was in drought in 24 of the last 52 weeks; the most was 100% of its area, in 7 weeks, most recently on the December 2, 2025 map.
| Category, October 13, 2026 | Share of county |
|---|---|
| D0 abnormally dry or worse | 100% |
| D1 moderate drought or worse | 89.7% |
| D2 severe or worse | 47.7% |
| D3 extreme or worse | 0% |
| D4 exceptional | 0% |
Flood losses since 2016
235 flood losses since 2016, $10.8 million paid. The worst year was 2025, with 124. Foundations of the buildings, where recorded: 13% basements, 14% slabs, 45% crawl spaces, 27% elevated. Median water depth outside the building: 24 in.
| Year | Flood losses |
|---|---|
| 2016 | 6 |
| 2017 | 8 |
| 2018 | 7 |
| 2019 | 0 |
| 2020 | 7 |
| 2021 | 70 |
| 2022 | 10 |
| 2023 | 1 |
| 2024 | 0 |
| 2025 | 124 |
| 2026 to date | 2 |
Rain
| Average year, 1991-2020 | 79.95 in |
| 12 months to August 2026 | 83.46 in (+3.51) |
| 2025 | 79.86 in (-0.09) |
| Wettest year since 1895 | 1990: 104.22 in |
| Driest year since 1895 | 1952: 47.14 in |
| Days with 1 inch or more, normal at CONCRETE PPL FISH STN (6 mi away) | 16.3 |
Homes
| Housing units | 57,050 |
| Median year built | 1986 |
| Built before 1980 | 42% |
| Built 2000 or later | 27% |
| Owner-occupied | 70% |
| Median value, owner-occupied | $545,100 |
| Single-family detached | 73% |
What repairs cost
Published ranges from cost guides, not quotes. More sources, and where they disagree.
Nearby counties
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Whatcom County, WA | 26 mi | 1% | 25% |
| Snohomish County, WA | 28 mi | 1% | 72% |
| Island County, WA | 44 mi | 0% | 65% |
| San Juan County, WA | 59 mi | 0% | 47% |
| King County, WA | 68 mi | under 1% | 38% |
| Kitsap County, WA | 69 mi | under 1% | 65% |
| Chelan County, WA | 69 mi | under 1% | 2% |
| Jefferson County, WA | 91 mi | 1% | 39% |
Sources: USDA SSURGO (August 28, 2025) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · NOAA (August 2026) · Census ACS 2020-2024. Methods · Data status