Soil series profile
Moko soil series
Moko is a well drained soil with a very gravelly silt loam surface, mapped on 570,570 acres in 61 counties across 3 states. Hydrologic group D.
- Drainage class
- Well drained 82% of mapped acres
- Hydrologic group
- D 100% of mapped acres
- Typical topsoil pH
- 7.2 neutral · range 7.2–7.4
- Mapped area
- 571k acres in 61 counties, 3 states
Typical Moko profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–7 in (A1) | Very gravelly silt loam | 7.2 | 26% | 20% | 4% |
| 7–12 in (A2) | Extremely flaggy silt loam | 7.2 | 25% | 15% | 2% |
| 12–79 in (2R) | Bedrock | Not reported | Not reported | Not reported | Not reported |
What this means
What Moko soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in Moko soils is neutral: pH 7.2 (most land between 7.2 and 7.4), the range most vegetables, flowers and lawn grasses prefer.
Loamy topsoil (loam, silt loam and similar) covers 100% of mapped Moko acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is very stony silt loam (46% of mapped Moko acres).
100% of mapped Moko acres is moderately well to excessively drained, which suits most garden plants.
For lawns and yards
On 100% 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.
For a septic system
For conventional septic absorption fields, NRCS rates 100% of the acres in mapped Moko soils very limited, 0% somewhat limited and 0% not limited.
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.
Only a licensed site evaluation or perc test at the actual lot decides whether a system is allowed and which design.
Where Moko soil is found
Mapped acres
Moko is mapped in Arkansas, Missouri and Oklahoma. The 60 counties with the most Moko acres:
| County | Acres | Share of county land |
|---|---|---|
| Marion County, AR | 55,399 | 14.6% |
| Carroll County, AR | 44,057 | 10.9% |
| Baxter County, AR | 43,810 | 12.4% |
| Ozark County, MO | 41,915 | 8.8% |
| Boone County, AR | 32,412 | 8.6% |
| Izard County, AR | 28,540 | 7.7% |
| Barry County, MO | 27,940 | 5.6% |
| Stone County, AR | 26,457 | 6.8% |
| Jefferson County, MO | 17,035 | 4.1% |
| Texas County, MO | 15,789 | 2.1% |
| Miller County, MO | 15,763 | 4.2% |
| Fulton County, AR | 15,308 | 3.9% |
| Sharp County, AR | 15,130 | 3.9% |
| Cole County, MO | 15,126 | 6.0% |
| Searcy County, AR | 14,212 | 3.4% |
| Polk County, MO | 14,197 | 3.5% |
| Newton County, AR | 12,054 | 2.3% |
| Osage County, MO | 10,576 | 2.7% |
| Maries County, MO | 9,894 | 2.9% |
| Washington County, MO | 9,551 | 2.0% |
| Franklin County, MO | 8,943 | 1.5% |
| Stone County, MO | 8,309 | 2.8% |
| Dade County, MO | 7,876 | 2.5% |
| Camden County, MO | 7,641 | 1.8% |
| Cedar County, MO | 7,469 | 2.5% |
| Gasconade County, MO | 7,050 | 2.1% |
| Taney County, MO | 6,365 | 1.6% |
| Independence County, AR | 5,943 | 1.2% |
| McDonald County, MO | 5,146 | 1.5% |
| Dallas County, MO | 4,244 | 1.2% |
| Crawford County, MO | 4,076 | 0.9% |
| Laclede County, MO | 3,732 | 0.8% |
| Douglas County, MO | 3,553 | 0.7% |
| Madison County, AR | 3,502 | 0.7% |
| Webster County, MO | 2,452 | 0.6% |
| Pulaski County, MO | 2,095 | 0.6% |
| Morgan County, MO | 1,987 | 0.5% |
| Dent County, MO | 1,904 | 0.4% |
| Cooper County, MO | 1,811 | 0.5% |
| Wright County, MO | 1,773 | 0.4% |
| Moniteau County, MO | 1,654 | 0.6% |
| Pettis County, MO | 1,527 | 0.3% |
| Benton County, AR | 1,486 | 0.3% |
| Randolph County, AR | 1,115 | 0.3% |
| Greene County, MO | 704 | 0.2% |
| Howell County, MO | 478 | 0.1% |
| Christian County, MO | 464 | 0.1% |
| Saline County, MO | 393 | 0.1% |
| Phelps County, MO | 333 | 0.1% |
| St. Clair County, MO | 314 | 0.1% |
| Oregon County, MO | 307 | 0.1% |
| St. Francois County, MO | 177 | 0.1% |
| Ste. Genevieve County, MO | 177 | 0.1% |
| Hickory County, MO | 156 | 0.1% |
| Lawrence County, AR | 106 | 0.0% |
| St. Louis County, MO | 63 | 0.0% |
| Adair County, OK | 28 | 0.0% |
| Lawrence County, MO | 25 | 0.0% |
| Iron County, MO | 19 | 0.0% |
| Ripley County, MO | 8 | 0.0% |
Septic absorption fields
NRCS rating, share of Moko acres
Show as a table
| Category | Share of acres |
|---|---|
| Not limited | 0.0% |
| Somewhat limited | 0.0% |
| Very limited | 100.0% |
Drainage, water table and flooding
Share of Moko acres
- Depth to seasonal high water table
- None reported within about 6.5 feet (median where reported).
- Flooding
- Not mapped as flooding on most acres.
- Slope
- Typically 9–32% (median 25%).
- Topsoil organic matter
- Median 5%.
Drainage class
Show as a table
| Category | Share of acres |
|---|---|
| Excessively drained | 0.0% |
| Somewhat excessively drained | 17.6% |
| Well drained | 82.4% |
| Moderately well drained | 0.0% |
| Somewhat poorly drained | 0.0% |
| Poorly drained | 0.0% |
| Very poorly drained | 0.0% |
Hydrologic soil group
Show as a table
| Category | Share of acres |
|---|---|
| A: fast infiltration (mostly sandy or gravelly) | 0.0% |
| B: moderate infiltration | 0.0% |
| C: slow infiltration | 0.0% |
| D: very slow infiltration (clayey, shallow or wet) | 100.0% |
| A/D: D as is, A if drained | 0.0% |
| B/D: D as is, B if drained | 0.0% |
| C/D: D as is, C if drained | 0.0% |
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 Moko (component kind "Series") in SSURGO: 570,570 acres.
- Method
- Shares are by mapped acres of Moko components. The profile comes from the single largest Moko component. Full methodology.