Soil series profile

Angelo soil series

Angelo is a well drained soil with a clay loam surface, mapped on 1,080,683 acres in 20 counties in TX. Hydrologic group C.

#151 by mapped area fine-silty Aridic Calciustolls (Mollisols)

Drainage class: Well drained
Hydrologic group: C
Typical topsoil pH: 8.2
Mapped area: 1.1M

Typical Angelo profile

Texture and pH by depth

Depth to scale. More strongly shaded layers hold more clay. Horizon names are the soil survey's (A = topsoil, B = subsoil, C = parent material).

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Typical Angelo horizons (representative values)
Depth	Texture	pH	Clay	Sand	Organic matter
0–6 in (H1)	Clay loam	8.2	35%	25%	2.5%
6–28 in (H2)	Clay	8.2	43%	28%	0.55%
28–80 in (H3)	Silty clay loam	8.2	38%	8%	0.25%

Representative values from the most extensive Angelo map unit (Angelo clay loam, 0 to 1 percent slopes, survey area TX451). Other map units of this series vary within the series range.

Stock photo for illustration, not a sample of this soil series. Credit on the Sources & method page.

What this means

What Angelo soil means for gardens, lawns and septic systems

For gardens

Typical topsoil in Angelo soils is moderately alkaline: pH 8.2. Acid-loving plants such as blueberries and azaleas struggle without amended beds, and some trees and shrubs show iron chlorosis (yellow leaves with green veins).

Loamy topsoil (loam, silt loam and similar) covers 79% of mapped Angelo acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is silty clay loam (52% of mapped Angelo acres).

100% of mapped Angelo acres is moderately well to excessively drained, which suits most garden plants.

For lawns and yards

On 95% 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 95% of the acres in mapped Angelo soils very limited, 0% somewhat limited and 0% not limited (5% 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.

Only a licensed site evaluation or perc test at the actual lot decides whether a system is allowed and which design.

Generated from the mapped numbers above using fixed rules, not a site visit. See how these notes are written.

Where Angelo soil is found

Mapped acres

Angelo is mapped in Texas.

Counties with the most mapped Angelo soil
County	Acres	Share of county land
Tom Green County, TX	335,251	34.4%
Sterling County, TX	142,844	24.2%
Irion County, TX	118,728	17.6%
Reagan County, TX	85,088	11.3%
Glasscock County, TX	76,623	13.3%
Crockett County, TX	70,925	4.0%
Schleicher County, TX	68,237	8.1%
Sutton County, TX	62,258	6.7%
Mitchell County, TX	51,583	8.9%
Concho County, TX	39,161	6.3%
Menard County, TX	11,393	2.0%
Edwards County, TX	9,406	0.7%
Howard County, TX	5,082	0.9%
Upton County, TX	1,256	0.2%
Coke County, TX	1,182	0.2%
Midland County, TX	851	0.1%
Real County, TX	469	0.1%
Nolan County, TX	167	0.0%
Brewster County, TX	96	0.0%
Kimble County, TX	82	0.0%

Septic absorption fields

NRCS rating, share of Angelo acres

Not limited 0%

Somewhat limited 0%

Very limited 95%

Not rated 5%

Septic tank absorption field rating across mapped Angelo acres. Scale 0 to 100% of mapped land.

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Septic tank absorption field rating across mapped Angelo acres.
Category	Share of acres
Not limited	0.0%
Somewhat limited	0.0%
Very limited	94.6%
Not rated	5.4%

Drainage, water table and flooding

Share of Angelo 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 0–2% (median 0%).
Topsoil organic matter: Median 3%.

Drainage class

Excessively drained 0%

Somewhat excessively drained 0%

Well drained >99%

Moderately well drained <1%

Somewhat poorly drained 0%

Poorly drained 0%

Very poorly drained 0%

Drainage class across mapped Angelo acres. Scale 0 to 100% of mapped land.

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Drainage class across mapped Angelo acres.
Category	Share of acres
Excessively drained	0.0%
Somewhat excessively drained	0.0%
Well drained	99.2%
Moderately well drained	0.8%
Somewhat poorly drained	0.0%
Poorly drained	0.0%
Very poorly drained	0.0%

Hydrologic soil group

A: fast infiltration (mostly sandy or gravelly) 0%

B: moderate infiltration 0%

C: slow infiltration 95%

D: very slow infiltration (clayey, shallow or wet) 0%

A/D: D as is, A if drained 0%

B/D: D as is, B if drained 0%

C/D: D as is, C if drained 0%

Not rated 5%

Hydrologic soil group across mapped Angelo acres. Scale 0 to 100% of mapped land.

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Hydrologic soil group across mapped Angelo acres.
Category	Share of acres
A: fast infiltration (mostly sandy or gravelly)	0.0%
B: moderate infiltration	0.0%
C: slow infiltration	94.6%
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%
Not rated	5.4%

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 Angelo (component kind "Series") in SSURGO: 1,080,683 acres.
Method: Shares are by mapped acres of Angelo components. The profile comes from the single largest Angelo component. Full methodology.

Independent reference site. No government affiliation or endorsement.

Full narrative description: USDA Official Soil Series Description for Angelo.