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Nassau Bay, Texas
Inside Nassau Bay's city limits, shrink-swell clay limits houses without basements on 31% of mapped land. A shallow water table limits basements on 30%.
That clay share is above Harris County's 25%. USDA doesn't rate the 30% of mapped land classed as urban land, so these shares are floors. FEMA's flood data list 371 flood losses since 2016 in ZIP code 77058 overlapping the city. Of its 2,939 homes, 72% were built before 1980; the median dates from 1970.
Data as of October 13, 2026 · sources · in Harris County
expansive clay: shrink-swell limits slab homes
high water table: limits basements
flood losses since 2016 in 1 overlapping ZIP
of homes built before 1980
Foundation repair in Nassau Bay
Foundation repair in Nassau Bay: shrink-swell clay limits slab homes on 31% of Nassau Bay's mapped land.
About 1,000 of Nassau Bay's 2,939 homes are detached houses.
| Who designs the repair | The ASCE Texas Section's repair guidelines say a Texas-licensed engineer should evaluate the foundation and design the repair (2022 guidelines) |
| Prices | Cost guide ranges compared |
Soil under Nassau Bay city limits
| Expansive clay (limits slab homes) | 30.8% |
| High water table (limits basements) | 29.5% |
| Septic fields very limited | 41.0% |
| Clay swell (LEP, by area) | 7.8% |
| High-swell land (LEP 6%+) | 30.8% |
| Urban land, not rated | 30.4% |
| Mapped soil | 1,103 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Ijam | 11% | n/a |
| Atasco | 10% | n/a |
| Verland | 9% | n/a |
| Texla | 6% | n/a |
| Aris | 2% | n/a |
| Lake Charles | 1% | 97% |
What the numbers mean here
Clay swell averages a linear extensibility of 7.8% by land area here, and 31% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 31% of the mapped land.
Clay shrinks as it dries: 82.9% of Harris County is in drought on the latest map, and 31% of Nassau Bay's mapped land has shrink-swell clay.
On 30% of Nassau Bay's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
Drought in Harris County
82.9% of Harris County is in drought (D1 or worse) on the October 13, 2026 map. County detail.
Flood losses by ZIP code
FEMA flood records since 2016 in the ZIP codes that overlap Nassau Bay. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 77058 | 100% | 371 | $18.4 million |
Homes in Nassau Bay
| Housing units | 2,939 |
| Median year built | 1970 |
| Built before 1980 | 72% |
| Built 2000 or later | 11% |
| Owner-occupied | 49% |
| Median value, owner-occupied | $374,600 |
| Single-family detached | 33% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Webster | 2 mi | 56% | 26% |
| Taylor Lake Village | 3 mi | 41% | 41% |
| El Lago | 3 mi | 47% | 41% |
| Clear Lake Shores | 3 mi | 16% | 57% |
| Kemah | 4 mi | 20% | 93% |
| League City | 4 mi | 42% | 71% |
| Seabrook | 7 mi | 13% | 15% |
| Shoreacres | 7 mi | 68% | 39% |
Sources: USDA SSURGO (August 5, 2026) · US Drought Monitor (October 13, 2026) · FEMA NFIP v3 (September 9, 2026) · Census ACS 2020-2024. Methods · Data status