Soil series profile
Kidami soil series
Kidami is a moderately well drained soil with a loam surface, mapped on 48,246 acres in 6 counties in IL. Hydrologic group C.
- Drainage class
- Moderately well drained 100% of mapped acres
- Hydrologic group
- C 100% of mapped acres
- Typical topsoil pH
- 6.2 slightly acidic · range 6.2–7.2
- Mapped area
- 48k acres in 6 counties, 1 state
Typical Kidami profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–10 in (H1) | Loam | 6.2 | 17% | 43% | 2% |
| 10–37 in (H2) | Clay loam | 6.2 | 27% | 37% | 0.75% |
| 37–45 in (H3) | Loam | 7.3 | 22% | 41% | 0.25% |
| 45–60 in (H4) | Loam | 7.9 | 18% | 43% | 0.25% |
What this means
What Kidami soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in Kidami soils is slightly acidic: pH 6.2 (most land between 6.2 and 7.2), the range most vegetables, flowers and lawn grasses prefer.
Loamy topsoil (loam, silt loam and similar) covers 100% of mapped Kidami acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is loam (58% of mapped Kidami acres).
100% of mapped Kidami 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 Kidami 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 Kidami soil is found
Mapped acres
Kidami is mapped in Illinois.
| County | Acres | Share of county land |
|---|---|---|
| McHenry County, IL | 20,926 | 5.7% |
| Kane County, IL | 17,885 | 5.4% |
| DeKalb County, IL | 6,052 | 1.5% |
| Boone County, IL | 2,343 | 1.3% |
| LaSalle County, IL | 932 | 0.1% |
| Lee County, IL | 108 | 0.0% |
Septic absorption fields
NRCS rating, share of Kidami 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 Kidami acres
- Depth to seasonal high water table
- About 2.6 feet (31 in) (median where reported).
- Flooding
- Not mapped as flooding on most acres.
- Slope
- Typically 3–9% (median 5%).
- Topsoil organic matter
- Median 2%.
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 | 100.0% |
| 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 | 100.0% |
| D: very slow infiltration (clayey, shallow or wet) | 0.0% |
| 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 Kidami (component kind "Series") in SSURGO: 48,246 acres.
- Method
- Shares are by mapped acres of Kidami components. The profile comes from the single largest Kidami component. Full methodology.