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Melissa, Texas
Inside Melissa's city limits, shrink-swell clay limits houses without basements on 69% of mapped land, higher than 74% of Texas cities. A shallow water table limits basements on under 1%.
That clay share is close to Collin County's 72%. FEMA's flood data list no flood losses since 2016 in ZIP code 75454 overlapping the city. Of its 6,266 homes, 3% were built before 1980; the median dates from 2015.
Data as of October 13, 2026 · sources · in Collin 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 Melissa
Foundation repair in Melissa: shrink-swell clay limits slab homes on 69% of Melissa's mapped land, more than in 74% of Texas cities.
About 5,800 of Melissa's 6,266 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 Melissa city limits
| Expansive clay (limits slab homes) | 69.2% |
| High water table (limits basements) | 0.1% |
| Septic fields very limited | 85.4% |
| Clay swell (LEP, by area) | 8.6% |
| High-swell land (LEP 6%+) | 49.1% |
| Mapped soil | 7,427 acres |
| Soil series | Share here | Series nationally: expansive clay |
|---|---|---|
| Houston Black | 44% | 91% |
| Austin | 21% | 93% |
| Heiden | 6% | 80% |
| Eddy | 6% | 0% |
| Stephen | 5% | n/a |
| Altoga | 4% | n/a |
What the numbers mean here
Clay swell averages a linear extensibility of 8.6% by land area here, and 49% of the land reaches USDA's high class (6% or more). Clay like that swells when wet and shrinks when dry, under 69% of the mapped land.
Clay shrinks as it dries: 100% of Collin County is in drought on the latest map, and 69% of Melissa's mapped land has shrink-swell clay.
USDA rates 85% of the land very limited for septic absorption fields.
Drought in Collin County
100% of Collin 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 Melissa. ZIP areas reach past city limits.
| ZIP | Share of city land | Flood losses | Paid |
|---|---|---|---|
| 75454 | 98% | 0 | $0 |
Homes in Melissa
| Housing units | 6,266 |
| Median year built | 2015 |
| Built before 1980 | 3% |
| Built 2000 or later | 91% |
| Owner-occupied | 89% |
| Median value, owner-occupied | $454,000 |
| Single-family detached | 93% |
Nearby cities
| Place | Distance | Expansive clay | High water table |
|---|---|---|---|
| Anna | 4 mi | 76% | under 1% |
| New Hope | 5 mi | 49% | under 1% |
| Weston | 7 mi | 77% | under 1% |
| Princeton | 8 mi | 83% | under 1% |
| Lowry Crossing | 8 mi | 72% | under 1% |
| McKinney | 9 mi | 73% | under 1% |
| Blue Ridge | 9 mi | 85% | 4% |
| Van Alstyne | 9 mi | 78% | under 1% |
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