Starr County, Texas
The dominant drainage class is Well drained and the dominant hydrologic group is B (moderate infiltration). This report summarizes the major soil map units across the survey area to help you understand what to expect when buying, building, or gardening in Starr County, Texas.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| McAllen fine sandy loam | 237K | Well drained | B | Not limited | Somewhat limited |
| Copita fine sandy loam, 0 to 3 percent slopes | 113K | Well drained | C | Somewhat limited | Very limited |
| Brennan fine sandy loam, 0 to 1 percent slopes | 65K | Well drained | B | Not limited | Somewhat limited |
| Zapata soils | 60K | Well drained | D | Very limited | Very limited |
| Catarina clay, association, 0 to 5 percent slopes | 53K | Moderately well drained | D | Very limited | Very limited |
| Ramadero loam | 43K | Well drained | B | Very limited | Very limited |
| Delmita fine sandy loam, 0 to 3 percent slopes | 37K | Well drained | C | Very limited | Very limited |
| Garceno clay loam | 28K | Well drained | B | Very limited | Somewhat limited |
| Sarita fine sand, 0 to 5 percent slopes | 26K | Well drained | A | Not limited | Somewhat limited |
| Jimenez-Quemado association | 23K | Well drained | D | Very limited | Very limited |
| Montell clay, 0 to 3 percent slopes | 20K | Moderately well drained | D | Very limited | Very limited |
| Delmita and Bruni soils, 0 to 3 percent slopes | 16K | Well drained | C | Very limited | Very limited |
| Reynosa silty clay loam | 8K | Well drained | B | Somewhat limited | Somewhat limited |
| Comitas loamy fine sand, 0 to 3 percent slopes | 7K | Well drained | A | Not limited | Not limited |
| Rio Grande silt loam, 0 to 1 percent slopes | 7K | Well drained | A | Very limited | Very limited |
| Lagloria silt loam | 7K | Well drained | B | Not limited | Somewhat limited |
| Matamoros silty clay | 5K | Moderately well drained | C | Very limited | Very limited |
| Camargo silty clay loam, 0 to 1 percent slopes, rarely flooded | 5K | Well drained | B | Very limited | Somewhat limited |
| Falfurrias fine sand, 0 to 5 percent slopes | 4K | Somewhat excessively drained | A | Not limited | Very limited |
| Water | 4K | D | Not rated | Not rated |
What This Means
Building & Foundations
About 38% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 49% of soils have significant septic limitations, while others are more suitable. A perc test is essential — conditions vary across the area.
Gardening & Agriculture
Drainage is generally favorable for gardening. Adding compost and mulch will improve fertility and water retention. Test your soil's pH before planting — most vegetables prefer 6.0-7.0.