Soil series profile
Hayhook soil series
Hayhook is a well drained soil with a loamy sand surface, mapped on 208,357 acres in 3 counties in AZ. Hydrologic group A.
- Drainage class
- Well drained 100% of mapped acres
- Hydrologic group
- A 100% of mapped acres
- Typical topsoil pH
- 7.2 neutral · range 7.0–7.5
- Mapped area
- 208k acres in 3 counties, 1 state
Typical Hayhook profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–1 in (A) | Loamy sand | 7.5 | 8% | 84% | 0.75% |
| 1–19 in (Bw) | Sandy loam | 7.5 | 14% | 67% | 0.75% |
| 19–60 in (Bk) | Sandy loam | 7.9 | 14% | 67% | 0.25% |
What this means
What Hayhook soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in Hayhook soils is neutral: pH 7.2 (most land between 7.0 and 7.5), the range most vegetables, flowers and lawn grasses prefer.
Loamy topsoil (loam, silt loam and similar) covers 78% of mapped Hayhook acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is sandy loam (78% of mapped Hayhook acres).
100% of mapped Hayhook acres is moderately well to excessively drained, which suits most garden plants.
For lawns and yards
100% of mapped acres is in hydrologic group A, where water soaks in fast. Lawns there dry out quickly; deeper, less frequent watering and organic matter help.
For a septic system
For conventional septic absorption fields, NRCS rates 0% of the acres in mapped Hayhook soils very limited, 0% somewhat limited and 100% not limited.
Only a licensed site evaluation or perc test at the actual lot decides whether a system is allowed and which design.
Where Hayhook soil is found
Mapped acres
Hayhook is mapped in Arizona.
| County | Acres | Share of county land |
|---|---|---|
| Pima County, AZ | 158,215 | 3.1% |
| Pinal County, AZ | 49,041 | 1.5% |
| Gila County, AZ | 1,102 | 0.1% |
Septic absorption fields
NRCS rating, share of Hayhook acres
Show as a table
| Category | Share of acres |
|---|---|
| Not limited | 100.0% |
| Somewhat limited | 0.0% |
| Very limited | 0.0% |
Drainage, water table and flooding
Share of Hayhook 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 2–3% (median 3%).
- Topsoil organic matter
- Median 0.8%.
Drainage class
Show as a table
| Category | Share of acres |
|---|---|
| Excessively drained | 0.0% |
| Somewhat excessively drained | 0.0% |
| Well drained | 100.0% |
| 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) | 100.0% |
| B: moderate infiltration | 0.0% |
| C: slow infiltration | 0.0% |
| 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 Hayhook (component kind "Series") in SSURGO: 208,357 acres.
- Method
- Shares are by mapped acres of Hayhook components. The profile comes from the single largest Hayhook component. Full methodology.