Soil series profile

Myakka soil series

Myakka is a poorly drained soil with a fine sand surface, mapped on 1,405,098 acres in 35 counties in FL. Hydrologic group A/D.

#91 by mapped area sandy Aeric Alaquods (Spodosols)

Drainage class
Poorly drained
96% of mapped acres
Hydrologic group
A/D
>99% of mapped acres
Typical topsoil pH
5.1
strongly acidic · range 5.1–5.1
Mapped area
1.4M
acres in 35 counties, 1 state

Typical Myakka profile

Texture and pH by depth

Typical Myakka soil profile by depth 0 in 20 in 40 in 60 in 0–6 in · A · pH 5.1 · 3% clay Fine sand 6–20 in · E · pH 5.1 · 2% clay Fine sand 20–36 in · Bh · pH 5.1 · 5% clay Fine sand 36–80 in · C · pH 5.1 · 2% clay Fine sand
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 Myakka horizons (representative values)
Depth Texture pH Clay Sand Organic matter
0–6 in (A) Fine sand 5.1 3% 96% 1.5%
6–20 in (E) Fine sand 5.1 2% 97% 0.25%
20–36 in (Bh) Fine sand 5.1 5% 94% 4%
36–80 in (C) Fine sand 5.1 2% 97% 0.25%

Representative values from the most extensive Myakka map unit (Myakka fine sand, 0 to 2 percent slopes, survey area FL057). Other map units of this series vary within the series range.

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

What this means

What Myakka soil means for gardens, lawns and septic systems

For gardens

Typical topsoil in Myakka soils is strongly acidic: pH 5.1. Most vegetables and lawn grasses do best around 6.0 to 7.0, so lime is often needed; blueberries, azaleas and rhododendrons like it as it is.

Sandy topsoil covers >99% of mapped Myakka acres. It drains fast and warms early in spring, but dries out and loses nutrients quickly: mulch, compost and steady watering help. The most common surface texture is fine sand (86% of mapped Myakka acres).

100% of mapped Myakka 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 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.

A seasonal high water table comes within 18 inches of the surface on 100% 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 100% of the acres in mapped Myakka 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.

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

Where Myakka soil is found

Mapped acres

Myakka is mapped in Florida.

Counties with the most mapped Myakka soil
County Acres Share of county land
Hillsborough County, FL 155,876 23.2%
Okeechobee County, FL 138,460 28.1%
Osceola County, FL 117,889 13.6%
Manatee County, FL 87,160 17.4%
Highlands County, FL 80,956 12.3%
Polk County, FL 75,686 6.5%
Lake County, FL 67,743 11.2%
Brevard County, FL 67,606 8.4%
Volusia County, FL 64,488 9.1%
Sarasota County, FL 59,430 13.4%
Putnam County, FL 51,009 11.0%
Palm Beach County, FL 49,051 3.9%
Hardee County, FL 43,525 10.7%
DeSoto County, FL 42,556 10.5%
St. Johns County, FL 40,531 10.3%
Glades County, FL 27,368 5.5%
Pinellas County, FL 25,970 12.1%
Hendry County, FL 24,913 3.3%
Indian River County, FL 23,842 7.1%
Levy County, FL 20,196 2.7%
Pasco County, FL 19,734 4.1%
Charlotte County, FL 19,553 4.4%
Flagler County, FL 18,991 6.1%
Seminole County, FL 18,419 9.3%
Lee County, FL 13,134 2.6%
St. Lucie County, FL 9,639 2.5%
Sumter County, FL 7,535 2.1%
Hernando County, FL 6,685 2.1%
Citrus County, FL 5,964 1.4%
Martin County, FL 5,405 1.6%
Collier County, FL 4,944 0.7%
Marion County, FL 4,692 0.4%
Alachua County, FL 3,878 0.7%
Orange County, FL 1,732 0.3%
Broward County, FL 534 0.1%

Septic absorption fields

NRCS rating, share of Myakka acres

Not limited 0%
Somewhat limited 0%
Very limited 100%
Septic tank absorption field rating across mapped Myakka acres. Scale 0 to 100% of mapped land.
Show as a table
Septic tank absorption field rating across mapped Myakka acres.
CategoryShare of acres
Not limited0.0%
Somewhat limited0.0%
Very limited100.0%

Drainage, water table and flooding

Share of Myakka acres

Depth to seasonal high water table
About 1.0 feet (12 in) (median where reported); within 18 inches on 100% of acres.
Flooding
Mapped as flooding on <1% of acres (<1% occasional, <1% frequent).
Slope
Typically 1–1% (median 1%).
Topsoil organic matter
Median 1.5%.

Drainage class

Excessively drained 0%
Somewhat excessively drained 0%
Well drained 0%
Moderately well drained 0%
Somewhat poorly drained 0%
Poorly drained 96%
Very poorly drained 4%
Drainage class across mapped Myakka acres. Scale 0 to 100% of mapped land.
Show as a table
Drainage class across mapped Myakka acres.
CategoryShare of acres
Excessively drained0.0%
Somewhat excessively drained0.0%
Well drained0.0%
Moderately well drained0.0%
Somewhat poorly drained0.0%
Poorly drained96.1%
Very poorly drained3.9%

Hydrologic soil group

A: fast infiltration (mostly sandy or gravelly) 0%
B: moderate infiltration 0%
C: slow infiltration 0%
D: very slow infiltration (clayey, shallow or wet) 0%
A/D: D as is, A if drained >99%
B/D: D as is, B if drained <1%
C/D: D as is, C if drained 0%
Hydrologic soil group across mapped Myakka acres. Scale 0 to 100% of mapped land.
Show as a table
Hydrologic soil group across mapped Myakka acres.
CategoryShare of acres
A: fast infiltration (mostly sandy or gravelly)0.0%
B: moderate infiltration0.0%
C: slow infiltration0.0%
D: very slow infiltration (clayey, shallow or wet)0.0%
A/D: D as is, A if drained99.1%
B/D: D as is, B if drained0.9%
C/D: D as is, C if drained0.0%

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 Myakka (component kind "Series") in SSURGO: 1,405,098 acres.
Method
Shares are by mapped acres of Myakka components. The profile comes from the single largest Myakka component. Full methodology.

Independent reference site. No government affiliation or endorsement.

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