Soil series profile
Falaya soil series
Falaya is a somewhat poorly drained soil with a silt loam surface, mapped on 970,386 acres in 54 counties across 7 states. Hydrologic group B/D.
- Drainage class
- Somewhat poorly drained 87% of mapped acres
- Hydrologic group
- B/D 79% of mapped acres
- Typical topsoil pH
- 5.0 very strongly acidic · range 5.0–5.3
- Mapped area
- 970k acres in 54 counties, 7 states
Typical Falaya profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–6 in (Ap) | Silt loam | 5.0 | 12% | 20% | 2% |
| 6–18 in (C) | Silt loam | 5.0 | 14% | 12% | 0.2% |
| 18–60 in (Cg) | Silt loam | 5.0 | 14% | 12% | 0.2% |

What this means
What Falaya soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in Falaya soils is very strongly acidic: pH 5.0 (most land between 5.0 and 5.3). Most vegetables and lawn grasses do best around 6.0 to 7.0, so lime is often needed; blueberries, azaleas and rhododendrons like it as it is.
Loamy topsoil (loam, silt loam and similar) covers 99% of mapped Falaya acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is silt loam (94% of mapped Falaya acres).
88% of mapped Falaya acres is somewhat poorly to very poorly drained, so soil stays soggy for long spells after rain and in wet seasons. Raised beds, plants that tolerate wet feet, and not working the soil while wet all help.
For lawns and yards
On 98% of mapped acres, rain soaks in slowly (hydrologic groups C and D, including dual groups that are D until drained). Expect runoff and puddles after heavy rain: core-aerate compacted lawns and keep ground sloping away from foundations.
A seasonal high water table comes within 18 inches of the surface on 75% of mapped acres, often in spring. Basements, sump pumps and lawns in low spots feel it first.
For a septic system
For conventional septic absorption fields, NRCS rates 99% of the acres in mapped Falaya soils very limited, 0% somewhat limited and 0% not limited (1% not rated, such as urban land, pits or water).
Where the soil is very limited (slow permeability, a high water table, flooding, shallow bedrock or steep slopes), alternative systems such as mound or sand-filter designs are common and cost more.
Flooding is mapped on 98% of the acres (69% occasional, 28% frequent).
Only a licensed site evaluation or perc test at the actual lot decides whether a system is allowed and which design.
Where Falaya soil is found
Mapped acres
Falaya is mapped in Mississippi, Tennessee, Missouri, Arkansas, Alabama, Kentucky and Louisiana.
| County | Acres | Share of county land |
|---|---|---|
| Shelby County, TN | 78,470 | 16.0% |
| Calhoun County, MS | 64,120 | 17.6% |
| Fayette County, TN | 49,496 | 11.1% |
| Panola County, MS | 48,439 | 11.5% |
| Stoddard County, MO | 47,725 | 9.5% |
| Grenada County, MS | 46,135 | 18.6% |
| Carroll County, TN | 42,849 | 11.2% |
| Lincoln County, MS | 36,980 | 10.0% |
| Gibson County, TN | 33,408 | 8.7% |
| Obion County, TN | 32,292 | 9.1% |
| Madison County, TN | 31,902 | 9.0% |
| Dyer County, TN | 31,555 | 9.5% |
| DeSoto County, MS | 30,774 | 10.4% |
| Greene County, AL | 29,969 | 8.9% |
| Weakley County, TN | 28,091 | 7.6% |
| Tippah County, MS | 27,706 | 10.0% |
| Tallahatchie County, MS | 24,891 | 6.6% |
| Clay County, AR | 24,377 | 6.0% |
| Claiborne County, MS | 23,907 | 8.2% |
| Tate County, MS | 21,234 | 8.7% |
| Pike County, MS | 19,136 | 7.8% |
| Craighead County, AR | 18,174 | 4.0% |
| Cape Girardeau County, MO | 14,292 | 3.9% |
| Warren County, MS | 12,458 | 3.4% |
| Graves County, KY | 12,139 | 3.4% |
| Dunklin County, MO | 12,054 | 3.6% |
| Adams County, MS | 11,953 | 4.7% |
| Yazoo County, MS | 11,128 | 2.0% |
| Jefferson County, MS | 10,818 | 3.5% |
| Marshall County, MS | 10,680 | 2.5% |
| Cleveland County, AR | 9,872 | 2.6% |
| Poinsett County, AR | 8,965 | 1.9% |
| Lee County, AR | 8,246 | 2.1% |
| Greene County, AR | 6,437 | 1.9% |
| Leflore County, MS | 6,208 | 1.7% |
| Carroll County, MS | 5,506 | 1.4% |
| Phillips County, AR | 4,947 | 1.1% |
| Scott County, MO | 4,805 | 1.9% |
| Pontotoc County, MS | 4,244 | 1.5% |
| Bollinger County, MO | 3,952 | 1.0% |
| St. Landry Parish, LA | 3,264 | 0.6% |
| Tipton County, TN | 3,260 | 1.1% |
| Hardin County, TN | 3,138 | 0.9% |
| Holmes County, MS | 2,833 | 0.6% |
| Walthall County, MS | 2,520 | 1.0% |
| Quitman County, MS | 1,970 | 0.8% |
| Crockett County, TN | 1,510 | 0.8% |
| Haywood County, TN | 430 | 0.1% |
| Butler County, MO | 384 | 0.1% |
| Marshall County, KY | 276 | 0.1% |
| McCracken County, KY | 230 | 0.1% |
| Calloway County, KY | 137 | 0.1% |
| Ballard County, KY | 97 | 0.1% |
| Henderson County, KY | 5 | 0.0% |
Septic absorption fields
NRCS rating, share of Falaya acres
Show as a table
| Category | Share of acres |
|---|---|
| Not limited | 0.0% |
| Somewhat limited | 0.0% |
| Very limited | 98.9% |
| Not rated | 1.1% |
Drainage, water table and flooding
Share of Falaya acres
- Depth to seasonal high water table
- About 1.5 feet (18 in) (median where reported); within 18 inches on 75% of acres.
- Flooding
- Mapped as flooding on 98% of acres (69% occasional, 28% frequent).
- Slope
- Typically 0–1% (median 1%).
- Topsoil organic matter
- Median 1.8%.
Drainage class
Show as a table
| Category | Share of acres |
|---|---|
| Excessively drained | 0.0% |
| Somewhat excessively drained | 0.0% |
| Well drained | 0.0% |
| Moderately well drained | 11.7% |
| Somewhat poorly drained | 87.3% |
| Poorly drained | 0.4% |
| Very poorly drained | 0.0% |
| Not rated | 0.6% |
Hydrologic soil group
Show as a table
| Category | Share of acres |
|---|---|
| A: fast infiltration (mostly sandy or gravelly) | 0.0% |
| B: moderate infiltration | 1.3% |
| C: slow infiltration | 18.2% |
| D: very slow infiltration (clayey, shallow or wet) | 0.1% |
| A/D: D as is, A if drained | 0.0% |
| B/D: D as is, B if drained | 78.7% |
| C/D: D as is, C if drained | 0.6% |
| Not rated | 1.1% |
Sources & data dates
- Source
- USDA NRCS Soil Survey Geographic Database (SSURGO), queried through Soil Data Access. Public domain.
- Data date
- SSURGO as published on November 3, 2026 (most recent survey area update October 26, 2026). NRCS refreshes SSURGO each October.
- Scope
- All map unit components named Falaya (component kind "Series") in SSURGO: 970,386 acres.
- Method
- Shares are by mapped acres of Falaya components. The profile comes from the single largest Falaya component. Full methodology.