Planning a well in Grayson County?
Water Well Drilling & Service in Grayson County, Texas
Grayson County sits over the Woodbine aquifer system (outcrop in a NE-SW band through central and eastern Grayson County; dips eastward into Fannin/Lamar/Red River counties). Most residential wells target the Woodbine Formation / Woodbine Aquifer; depth varies meaningfully across the county and is best estimated from neighboring TWDB well records. Drilling is regulated by the Red River GCD, which requires a pre-drilling permit. Local water quality consideration: Iron and manganese in the Woodbine are documented problems and treatment is commonly required; the lower Woodbine zones yield the most water, while the upper zone yields little and runs very high in iron.
What’s Under Grayson County: a Layer-by-Layer Look
About this diagram
This cross-section shows the actual rock formations beneath Grayson County, from topsoil down to the Woodbine aquifer system.
Tap any layer in the image, or any layer in the list, to explore each layer and what it means for drilling a well on your property.
- Topsoil — Blackland to Post Oak transition0–15 ft
- Austin Chalk margin15–60 ft
- Woodbine Formation60–250 ft
- Trinity (Antlers Formation)250–350 ft
Grayson County stratigraphy — top to bottom
- Topsoil — Blackland to Post Oak transition
- Reddish-brown sandy clay loam.
- Austin Chalk margin
- Upper Cretaceous cover above the Woodbine (Pawpaw Formation, Eagle Ford Shale, Austin Chalk); yields only small amounts locally and is not a dependable residential aquifer.
- Woodbine Formation
- Sandstone interbedded with shale and clay — three water-bearing zones, the lower two typically developed. Outcrops in a NE–SW band through central and eastern Grayson County; the green-gray glauconitic tint is its visual signature.
- Trinity (Antlers Formation)
- The deeper alternative. It surfaces mainly in western and northwestern Grayson County and dips beneath younger rock to the southeast. It is the Paluxy and Twin Mountains merged into one body (the Antlers), because the Glen Rose Limestone is missing across Grayson County (TWDB Report 269). Thickness runs ~400 ft near the surface to ~900 ft to the southeast — one county well logged 870 ft of Antlers.
0–15 ft
15–60 ft
60–250 ft
250–350 ft
Grayson County stratigraphy — top to bottom
- Topsoil — Blackland to Post Oak transition (0–15 ft)
- Reddish-brown sandy clay loam.
- Austin Chalk margin (15–60 ft)
- Upper Cretaceous cover above the Woodbine (Pawpaw Formation, Eagle Ford Shale, Austin Chalk); yields only small amounts locally and is not a dependable residential aquifer.
- Woodbine Formation (60–250 ft)
- Sandstone interbedded with shale and clay — three water-bearing zones, the lower two typically developed. Outcrops in a NE–SW band through central and eastern Grayson County; the green-gray glauconitic tint is its visual signature.
- Trinity (Antlers Formation) (250–350 ft)
- The deeper alternative. It surfaces mainly in western and northwestern Grayson County and dips beneath younger rock to the southeast. It is the Paluxy and Twin Mountains merged into one body (the Antlers), because the Glen Rose Limestone is missing across Grayson County (TWDB Report 269). Thickness runs ~400 ft near the surface to ~900 ft to the southeast — one county well logged 870 ft of Antlers.
Grayson County Quick Facts
- Primary Aquifer
- Woodbine
- Typical Well Depth
- Varies by location
- Groundwater District
- Red River GCD
- Confinement
- outcrop in a NE-SW band through central and eastern Grayson County; dips eastward into Fannin/Lamar/Red River counties
Secondary: Trinity (Antlers)
We estimate from nearby well records
Water Quality Notes
- Iron and manganese in the Woodbine are documented problems and treatment is commonly required; the lower Woodbine zones yield the most water, while the upper zone yields little and runs very high in iron
- Woodbine water is generally fresh down to about 1,500 ft of well depth, turning slightly to moderately salty below that
Cities We Serve in Grayson County
Denison, TX
DFW Well Service drills and services wells in Denison and Grayson County near Lake Texoma. Red River GCD governs permitting; depth varies by parcel.
View Denison details →Sherman, TX
DFW Well Service drills and services wells in Sherman and Grayson County under Red River GCD. Woodbine, Antlers (Trinity); depth varies by parcel.
View Sherman details →Van Alstyne, TX
Licensed well drilling and pump service in Van Alstyne and Grayson County, where the Woodbine aquifer supplies most rural acreage properties.
View Van Alstyne details →What's Under Grayson County: the Geology Story
Drilling in Grayson County means starting in topsoil, working through Quaternary alluvium (Red River), Upper Cretaceous units above Woodbine (Pawpaw Fm, Eagle Ford Shale, Austin Chalk), to reach the Woodbine Formation / Woodbine Aquifer — the producing zone for most domestic wells.
The full layer-by-layer stratigraphy is laid out under the cube above. Well depth in Grayson County varies by property location and overburden thickness; your driller can review TWDB records for neighboring wells to refine the expected completion zone before drilling.
Permits & Regulations in Grayson County
Grayson County wells are regulated by the Red River GCD. A pre-drilling permit is required before any new well is constructed. DFW Well Service submits the permit application as part of our drilling process.
Full Grayson County permit & regulations →Frequently Asked Questions about Grayson County Wells
What aquifer is under Grayson County?
How deep are wells typically drilled in Grayson County?
What water quality issues are common in Grayson County wells?
Does Grayson County require a permit to drill a water well?
What's the main producing formation in Grayson County?
Ready to drill or service a well in Grayson County?
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