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Mont Belvieu, Texas
Inside Mont Belvieu's city limits, shrink-swell clay limits houses without basements on 42% of mapped land, the 4th-highest of 5 cities in Chambers County. A shallow water table limits basements on 44%, the 3rd-highest of 5 cities in Chambers County.
That clay share is below Chambers County's 63%. FEMA's flood data list 735 flood losses since 2016 in the 3 ZIP codes overlapping the city. Of its 3,111 homes, 12% were built before 1980; the median dates from 2014.
Data as of October 13, 2026 · sources · in Chambers County
expansive clay: shrink-swell limits slab homes
high water table: limits basements
flood losses since 2016 in 3 overlapping ZIPs
of homes built before 1980
Foundation repair in Mont Belvieu
Foundation repair in Mont Belvieu: shrink-swell clay limits slab homes on 42% of Mont Belvieu's mapped land, more than in 50% of Texas cities.
About 2,300 of Mont Belvieu's 3,111 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 Mont Belvieu city limits
| Expansive clay (limits slab homes) | 41.8% |
| High water table (limits basements) | 43.8% |
| Septic fields very limited | 72.6% |
| Clay swell (LEP, by area) | 9.9% |
| High-swell land (LEP 6%+) | 39.0% |
| Urban land, not rated | 18.5% |
| Mapped soil | 11,592 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| League | 26% | 92% |
| Morey | 19% | n/a |
| Beaumont | 10% | n/a |
| Anahuac | 4% | n/a |
| Aris | 4% | n/a |
| Orcadia | 3% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 9.9% by land area here, and 39% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 42% of the mapped land.
Clay shrinks as it dries: 100% of Chambers County is in drought on the latest map, and 42% of Mont Belvieu's mapped land has shrink-swell clay.
On 44% of Mont Belvieu's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 73% of the land very limited for septic absorption fields.
Drought in Chambers County
100% of Chambers 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 Mont Belvieu. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 77523 | 72% | 318 | $21.6 million |
| 77535 | 15% | 413 | $26.3 million |
| 77580 | 9% | 4 | $18,790 |
Homes in Mont Belvieu
| Housing units | 3,111 |
| Median year built | 2014 |
| Built before 1980 | 12% |
| Built 2000 or later | 77% |
| Owner-occupied | 75% |
| Median value, owner-occupied | $411,000 |
| Single-family detached | 74% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Old River-Winfree | 3 mi | 63% | 39% |
| Cove | 4 mi | 72% | 51% |
| Baytown | 8 mi | 61% | 59% |
| Beach City | 8 mi | 22% | 40% |
| Dayton | 12 mi | 59% | 56% |
| Anahuac | 13 mi | 69% | 71% |
| Liberty | 14 mi | 51% | 69% |
| Morgan's Point | 14 mi | 36% | 23% |
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