Sanilac County Soil Data
Sanilac County, Michigan
Avg pH
6.1
Texture
Silt loam
Drainage
Moderately well drained
Organic Matter
9.9%
Hydrologic Group
B/D
Data Story
About Soil in Sanilac County, Michigan
Rich Mollisols of the Thumb
Sanilac County is defined by its Mollisols and an average pH of 6.05, placing it between the acidic state average of 5.30 and the national median of 6.5. These soils are often referred to as the 'black gold' of agriculture due to their high organic content. The dominant silt loam texture makes this one of the most productive regions in the state.
Silky Texture and High Retention
The soil mix contains 58.8% sand, 25.5% silt, and 14.3% clay. This silt loam classification means the soil is exceptionally smooth to work with and excels at holding onto nutrients. The significant silt and clay fractions prevent the rapid leaching often seen in sandier neighboring counties.
Exceptional Organic Wealth
With 9.85% organic matter, Sanilac vastly outperforms the national average of 2.0%, providing a naturally nutrient-rich environment. Its available water capacity of 0.175 in/in is robust, though it trails the state average of 0.202 in/in. This combination ensures high fertility and resilience during short dry spells.
Infiltration Challenges and Solutions
Classified as moderately well drained with a dual hydrologic group of B/D, the soil's behavior varies depending on local water tables. While it typically allows for good infiltration, the 'D' classification suggests some areas face restricted drainage when saturated. This dual nature requires careful management for both residential basements and large-scale agriculture.
A Gardeners Paradise in 6a
Hardiness Zone 6a supports a diverse array of crops, particularly the sugar beets and dry beans Sanilac is famous for. Home gardeners will find the nutrient-dense silt loam perfect for heavy-feeding vegetables like squash and peppers. These soils are ready to support a bountiful backyard harvest.
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
Moderately well drained
Water is removed somewhat slowly. May have a slowly permeable layer or seasonal water table.
Soil Profile
Dominant texture: Silt loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Frequently Asked Questions
What type of soil does Sanilac County have?
Sanilac County's soil is classified as Silt loam. This indicates the relative proportions of sand, silt, and clay — 59% sand, 25% silt, and 14% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Sanilac County's soil acidic or alkaline?
Sanilac County's soil has a pH of 6.1, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for Sanilac County?
Sanilac County has a dominant drainage class of "Moderately 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 Sanilac County's soil?
Based on Sanilac County's Silt loam texture, pH of 6.1, and Moderately well drained, the soil is well suited for vegetables, grains, and most field crops, row crops and vegetable gardens, most annual and perennial crops.
What USDA soil order is found in Sanilac County?
Sanilac County's dominant soil order is Mollisols. Mollisols are fertile, dark-colored soils that formed under grassland vegetation. They are among the most productive agricultural soils in the world.
Planning your lawn? View lawn care data for Sanilac County on LawnByCounty.com →
Other Counties in Michigan
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.