Soil series profile

Wilid soil series

Wilid is a well drained soil with a silt loam surface, mapped on 652,557 acres in 13 counties in CO. Hydrologic group C.

#378 by mapped area fine-silty Ustic Calciargids (Aridisols)

Drainage class: Well drained
Hydrologic group: C
Typical topsoil pH: 7.9
Mapped area: 653k

Typical Wilid 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).

Show as a table

Typical Wilid horizons (representative values)
Depth	Texture	pH	Clay	Sand	Organic matter
0–6 in (A)	Silt loam	7.9	25%	12%	1.5%
6–10 in (Bt)	Silty clay loam	8.2	33%	7%	0.5%
10–30 in (Btk)	Silty clay loam	8.2	34%	7%	0.5%
30–44 in (Bk1)	Silty clay loam	8.2	28%	10%	0.5%
44–79 in (Bk2)	Silt loam	8.2	25%	15%	0.25%

Representative values from the most extensive Wilid map unit (Wilid silt loam, 0 to 3 percent slopes, survey area CO628). 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 Wilid soil means for gardens, lawns and septic systems

For gardens

Typical topsoil in Wilid soils is moderately alkaline: pH 7.9. 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 100% of mapped Wilid acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is silt loam (>99% of mapped Wilid acres).

100% of mapped Wilid 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 >99% of the acres in mapped Wilid soils very limited, <1% 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.

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

Where Wilid soil is found

Mapped acres

Wilid is mapped in Colorado.

Counties with the most mapped Wilid soil
County	Acres	Share of county land
Las Animas County, CO	181,738	6.0%
Bent County, CO	134,244	13.7%
Pueblo County, CO	78,829	5.2%
Kiowa County, CO	78,186	6.8%
Prowers County, CO	59,502	5.7%
Huerfano County, CO	36,305	3.6%
Lincoln County, CO	35,200	2.1%
Otero County, CO	20,250	2.5%
El Paso County, CO	10,607	0.7%
Baca County, CO	8,282	0.5%
Fremont County, CO	5,792	0.6%
Crowley County, CO	3,553	0.7%
Elbert County, CO	70	0.0%

Septic absorption fields

NRCS rating, share of Wilid acres

Not limited 0%

Somewhat limited <1%

Very limited >99%

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

Show as a table

Septic tank absorption field rating across mapped Wilid acres.
Category	Share of acres
Not limited	0.0%
Somewhat limited	0.7%
Very limited	99.3%

Drainage, water table and flooding

Share of Wilid 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 2%).
Topsoil organic matter: Median 1.5%.

Drainage class

Excessively drained 0%

Somewhat excessively drained 0%

Well drained 100%

Moderately well drained 0%

Somewhat poorly drained 0%

Poorly drained 0%

Very poorly drained 0%

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

Show as a table

Drainage class across mapped Wilid acres.
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

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

B: moderate infiltration 0%

C: slow infiltration 100%

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%

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

Show as a table

Hydrologic soil group across mapped Wilid acres.
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 Wilid (component kind "Series") in SSURGO: 652,557 acres.
Method: Shares are by mapped acres of Wilid components. The profile comes from the single largest Wilid component. Full methodology.

Independent reference site. No government affiliation or endorsement.

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