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Kodiak Island Borough, Alaska

A shallow water table limits basements on 27% of Kodiak Island Borough's mapped land. Shrink-swell clay limits houses without basements on 0%.

The soil survey maps 74% of the county's land area; these shares describe the mapped part. None of the county is in drought on the November 3, 2026 Drought Monitor map. FEMA's flood data list no flood losses here since 2016. 35% of homes were built before 1980, against 50% nationally; the median home dates from 1987.

Data as of November 3, 2026 · sources

0%

expansive clay: shrink-swell limits slab homes

27%

high water table: limits basements

0%

in drought, November 3, 2026

35%

of homes built before 1980

Soil under Kodiak Island Borough

Expansive clay (limits slab homes)0.0%
High water table (limits basements)26.9%
Septic fields very limited90.3%
Clay swell (LEP, by area)0.6%
High-swell land (LEP 6%+)0.0%
Mapped soil3,151,038 acres
Lake and Peninsula Borough: no dataBristol Bay Borough: 34%Kenai Peninsula Borough: 39%Dillingham Census Area: 61%Anchorage Municipality: 28%Bethel Census Area: no dataChugach Census Area: 29%Matanuska-Susitna Borough: no dataKodiak Island Borough Lake and PeninsulaBristol BayKenai PeninsulaDillinghamAnchorageBethelChugachMatanuska-SusitnaKodiak Island
Kodiak Island Borough (heavy outline) and nearby counties, shaded by high water table share.under 10%10-25%25-40%40-60%60%+

How we count · survey areas AK621 (2025-09-02)

What the numbers mean here

On 27% of Kodiak Island Borough'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: 54.98 in, 10.41 in below the 1991-2020 average year of 65.39 in.

USDA rates 90% of the land very limited for septic absorption fields.

Drought

0% of the county is in drought (D1 or worse) on the November 3, 2026 map. No part of the county was in drought in the last 52 weeks.

November 11, 2025Share of area in drought, weeklyNovember 3, 2026
Category, November 3, 2026Share of county
D0 abnormally dry or worse0%
D1 moderate drought or worse0%
D2 severe or worse0%
D3 extreme or worse0%
D4 exceptional0%

Flood losses since 2016

FEMA's flood data list no flood losses in Kodiak Island Borough since 2016.

Rain

Average year, 1991-202065.39 in
12 months to August 202654.98 in (-10.41)
202562.11 in (-3.28)
Wettest year since 19251929: 81.02 in
Driest year since 19251954: 41.51 in

Homes

Housing units5,854
Median year built1987
Built before 198035%
Built 2000 or later26%
Owner-occupied61%
Median value, owner-occupied$412,300
Single-family detached66%

What repairs cost

Published ranges from cost guides, not quotes. More sources, and where they disagree.

WorkRangeSource
Basement waterproofing, US $3,000 to $10,000 Fixr, February 6, 2026
Sump pump installation, US $800 to $2,000 Fixr, January 31, 2025
Crawl space encapsulation, US $2,000 to $8,000 Fixr, August 29, 2025

Nearby counties

PlaceDistanceExpansive clayHigh water table
Lake and Peninsula Borough, AK 94 mi n/a n/a
Bristol Bay Borough, AK 132 mi 0% 34%
Kenai Peninsula Borough, AK 193 mi 0% 39%
Dillingham Census Area, AK 202 mi 0% 61%
Anchorage Municipality, AK 290 mi 0% 28%
Bethel Census Area, AK 313 mi n/a n/a
Chugach Census Area, AK 334 mi 0% 29%
Matanuska-Susitna Borough, AK 350 mi n/a n/a

Sources: USDA SSURGO (September 2, 2025) · US Drought Monitor (November 3, 2026) · FEMA NFIP v3 (September 9, 2026) · NOAA (August 2026) · Census ACS 2020-2024. Methods · Data status