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Conroe, Texas
Inside Conroe's city limits, shrink-swell clay limits houses without basements on 10% of mapped land, the 4th-highest of 14 cities in Montgomery County. A shallow water table limits basements on 64%, the 5th-highest of 14 cities in Montgomery County.
That clay share is close to Montgomery County's 15%. FEMA's flood data list 430 flood losses since 2016 in the 4 ZIP codes overlapping the city. Of its 42,431 homes, 17% were built before 1980; the median dates from 2006.
Data as of September 22, 2026 · sources · in Montgomery County
expansive clay: shrink-swell limits slab homes
high water table: limits basements
flood losses since 2016 in 4 overlapping ZIPs
of homes built before 1980
Soil under Conroe city limits
| Expansive clay (limits slab homes) | 10.4% |
| High water table (limits basements) | 63.7% |
| Septic fields very limited | 89.0% |
| Clay swell (LEP, by area) | 4.0% |
| High-swell land (LEP 6%+) | 10.7% |
| Urban land, not rated | 4.5% |
| Mapped soil | 49,034 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Conroe | 31% | 0% |
| Splendora | 8% | n/a |
| Landman | 7% | n/a |
| Segno | 5% | n/a |
| Lilbert | 5% | 0% |
| Betis | 5% | n/a |
What the numbers mean here
On 64% of Conroe's mapped land, soil stays saturated within about 6 feet of the surface for part of the year, which is basement depth.
USDA rates 89% of the land very limited for septic absorption fields.
Drought in Montgomery County
0% of Montgomery County is in drought (D1 or worse) on the September 22, 2026 map. County detail.
Flood losses by ZIP code
FEMA flood records since 2016 in the ZIP codes that overlap Conroe. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 77304 | 37% | 192 | $13.8 million |
| 77301 | 26% | 131 | $6.8 million |
| 77303 | 15% | 76 | $3.6 million |
| 77384 | 7% | 31 | $1.5 million |
Homes in Conroe
| Housing units | 42,431 |
| Median year built | 2006 |
| Built before 1980 | 17% |
| Built 2000 or later | 61% |
| Owner-occupied | 55% |
| Median value, owner-occupied | $309,600 |
| Single-family detached | 56% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Panorama Village | 4 mi | 0% | 63% |
| Willis | 7 mi | 15% | 85% |
| Cut and Shoot | 8 mi | 1% | 49% |
| Woodloch | 9 mi | 7% | 38% |
| Shenandoah | 10 mi | 0% | 48% |
| Oak Ridge North | 12 mi | 0% | 42% |
| Montgomery | 13 mi | 81% | 27% |
| New Waverly | 15 mi | 43% | 53% |
Sources: USDA SSURGO (August 5, 2026) · US Drought Monitor (September 22, 2026) · FEMA NFIP v3 (September 9, 2026) · Census ACS 2020-2024. Methods · Data status