Soil series profile
Clovelly soil series
Clovelly is a very poorly drained soil with a muck surface, mapped on 382,269 acres in 15 counties across 2 states. Hydrologic group C/D.
- Drainage class
- Very poorly drained 99% of mapped acres
- Hydrologic group
- C/D 74% of mapped acres
- Typical topsoil pH
- 6.6 neutral · range 6.6–6.6
- Mapped area
- 382k acres in 15 counties, 2 states
Typical Clovelly profile
Texture and pH by depth
Show as a table
| Depth | Texture | pH | Clay | Sand | Organic matter |
|---|---|---|---|---|---|
| 0–28 in (Oa) | Muck | 6.6 | Not reported | Not reported | 45.5% |
| 28–79 in (Cg) | Clay | 6.9 | 72% | 2% | 0.6% |

What this means
What Clovelly soil means for gardens, lawns and septic systems
For gardens
Typical topsoil in Clovelly soils is neutral: pH 6.6, the range most vegetables, flowers and lawn grasses prefer.
Organic muck or peat is the most common topsoil (99% of mapped Clovelly acres). It is rich and holds water, but is often wet, can be acidic, and settles when drained. The most common surface texture is muck (99% of mapped Clovelly acres).
99% of mapped Clovelly acres is somewhat poorly to very poorly drained, so soil stays soggy for long spells after rain and in wet seasons. Raised beds, plants that tolerate wet feet, and not working the soil while wet all help.
For lawns and yards
On 99% 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.
A seasonal high water table comes within 18 inches of the surface on 99% of mapped acres, often in spring. Basements, sump pumps and lawns in low spots feel it first.
For a septic system
For conventional septic absorption fields, NRCS rates 99% of the acres in mapped Clovelly soils very limited, 0% somewhat limited and 0% not limited (2% 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.
Flooding is mapped on 99% of the acres (0% occasional, 99% frequent).
Only a licensed site evaluation or perc test at the actual lot decides whether a system is allowed and which design.
Where Clovelly soil is found
Mapped acres
Clovelly is mapped in Louisiana and Texas.
| County | Acres | Share of county land |
|---|---|---|
| Terrebonne Parish, LA | 81,129 | 11.2% |
| Cameron Parish, LA | 74,741 | 9.2% |
| Plaquemines Parish, LA | 64,396 | 17.1% |
| St. Bernard Parish, LA | 45,837 | 18.9% |
| Vermilion Parish, LA | 40,242 | 5.7% |
| Orleans Parish, LA | 18,092 | 17.6% |
| Jefferson Parish, LA | 15,754 | 9.2% |
| Lafourche Parish, LA | 14,446 | 2.4% |
| St. Tammany Parish, LA | 13,378 | 2.5% |
| Calcasieu Parish, LA | 7,150 | 1.1% |
| St. Mary Parish, LA | 5,934 | 1.5% |
| St. Charles Parish, LA | 794 | 0.5% |
| Jefferson County, TX | 368 | 0.1% |
| Iberia Parish, LA | 6 | 0.0% |
| St. Martin Parish, LA | 4 | 0.0% |
Septic absorption fields
NRCS rating, share of Clovelly acres
Show as a table
| Category | Share of acres |
|---|---|
| Not limited | 0.0% |
| Somewhat limited | 0.0% |
| Very limited | 98.5% |
| Not rated | 1.5% |
Drainage, water table and flooding
Share of Clovelly acres
- Depth to seasonal high water table
- About 0 inches (median where reported); within 18 inches on 99% of acres.
- Flooding
- Mapped as flooding on 99% of acres (0% occasional, 99% frequent).
- Slope
- Typically 0–0% (median 0%).
- Topsoil organic matter
- Median 45.5%.
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 | 0.0% |
| Somewhat poorly drained | 0.0% |
| Poorly drained | 0.0% |
| Very poorly drained | 99.0% |
| Not rated | 1.0% |
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) | 18.8% |
| A/D: D as is, A if drained | 5.7% |
| B/D: D as is, B if drained | 0.0% |
| C/D: D as is, C if drained | 74.1% |
| Not rated | 1.5% |
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 Clovelly (component kind "Series") in SSURGO: 382,269 acres.
- Method
- Shares are by mapped acres of Clovelly components. The profile comes from the single largest Clovelly component. Full methodology.