Gwinnett County Soil Data
Gwinnett County, Georgia
Avg pH
5.4
Texture
Sandy loam
Drainage
Well drained
Organic Matter
1.3%
Hydrologic Group
B
Data Story
About Soil in Gwinnett County, Georgia
The Piedmont Ultisols of Gwinnett
Gwinnett's soil belongs to the Ultisols order and maintains an average pH of 5.44. While this is more acidic than the national 6.5 benchmark, it is among the least acidic in Georgia. These highly weathered soils are typical of the state's urban and suburban heartland.
A Substantial Clay Presence
The texture is classified as sandy loam, but with 19.4% clay, it has more body than many neighboring counties. Sand makes up 54.8% of the mix, while silt accounts for 24.7%. This composition provides a firm structure that retains nutrients better than pure sand.
Reliable Water Capacity
Gwinnett features an available water capacity of 0.127 in/in, which exceeds the state average of 0.114. Organic matter is 1.25%, falling short of the state average of 1.83%. This soil holds water efficiently but benefits greatly from the addition of compost or manure.
Excellent Infiltration for Development
The soil is categorized as well drained and sits in hydrologic group B. This means the ground manages rainfall effectively, reducing surface runoff compared to heavier clay soils. These characteristics make Gwinnett's land favorable for both residential landscaping and infrastructure.
Garden Potential in Zone 8a
Gwinnett County is in Zone 8a, where mild winters and long summers thrive. The well-drained sandy loam is perfect for a lush backyard vegetable garden or ornamental shrubs like azaleas. With a bit of pH balancing, your Gwinnett garden can be incredibly productive.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Group B — Moderate Runoff
Moderately deep, moderately well-drained soils with moderate infiltration rates. Good balance of drainage and water retention.
Drainage Class
Well drained
Water is removed from the soil readily but not rapidly. Optimal for most plants and construction.
Soil Profile
Dominant texture: Sandy loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Frequently Asked Questions
What type of soil does Gwinnett County have?
Gwinnett County's soil is classified as Sandy loam. This indicates the relative proportions of sand, silt, and clay — 55% sand, 25% silt, and 19% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Gwinnett County's soil acidic or alkaline?
Gwinnett County's soil has a low pH of 5.4, which is strongly acidic. Acidic soils benefit from lime applications to raise pH and improve nutrient availability.
What is the drainage class for Gwinnett County?
Gwinnett County has a dominant drainage class of "Well drained." Well-drained soils allow excess water to move through quickly, reducing waterlogging risk and supporting most field and garden crops.
What crops or plants grow well in Gwinnett County's soil?
Based on Gwinnett County's Sandy loam texture, pH of 5.4, and Well drained, the soil is well suited for acid-loving plants like blueberries and azaleas, row crops and vegetable gardens, most annual and perennial crops.
What USDA soil order is found in Gwinnett County?
Gwinnett County's dominant soil order is Ultisols. Ultisols are highly weathered, clay-rich soils common in humid regions. They are low in natural fertility and often require lime and fertilizer for agriculture.
Planning your lawn? View lawn care data for Gwinnett County on LawnByCounty.com →
Other Counties in Georgia
Soil data sourced from USDA SSURGO via Soil Data Access. Data is informational only and should not be used as a substitute for on-site soil testing. Contact your local NRCS office for site-specific soil information.