Planning a well in Navarro County?

Welcome to Navarro County, Texas — DFW Well Service provides water well drilling and pump repair across Navarro County

Water Well Drilling & Service in Navarro County, Texas

Navarro County sits over the Nacatoch Sand aquifer system (outcrop across central and eastern Navarro County; dips SE at roughly 40–100 ft/mile). Most residential wells target the Nacatoch Sand at 100–800 feet. Navarro County sits outside all groundwater conservation districts — TDLR standards govern. Local water quality consideration: Nacatoch water is alkaline and sodium-rich (sodium-bicarbonate type), so it is soft rather than hard.

What’s Under Navarro County: a Layer-by-Layer Look

About this diagram

This cross-section shows the actual rock formations beneath Navarro County, from topsoil down to the Nacatoch Sand 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.

Isometric geological cross-section cube illustration showing Navarro County, Texas stratigraphy — Topsoil, Navarro Group clays and marls (Corsicana Marl, Kemp Clay), Nacatoch Sand, Taylor Group / Austin Chalk / Eagle Ford / Woodbine, Trinity Group, and the Nacatoch Sand aquifer at the base.

Topsoil — Blackland Prairie (deep southern extension)
0–15 ft
Navarro Group clays and marls (Corsicana Marl, Kemp Clay)
15–varies
Nacatoch Sand
100–800 (depending on outcrop position) ft
Taylor Group / Austin Chalk / Eagle Ford / Woodbine
deep
Trinity Group
very deep
Carrizo-Wilcox (Carrizo Formation, Wilcox Group)
200–600 (far SE corner only) ft

Hover or tap a layer in the cube to see formation details.

Navarro County stratigraphy — top to bottom

Topsoil — Blackland Prairie (deep southern extension): Dark black clay that swells and shrinks with moisture (shrink-swell).
Navarro Group clays and marls (Corsicana Marl, Kemp Clay): Lime-rich clay and marl that produces no usable water. Corsicana is the namesake reference site (type locality) for the whole Navarro Group, and the Corsicana Marl's reference site is about two miles south of the courthouse at the Corsicana Brick Company pit.
Nacatoch Sand: The principal local water source. It reaches the surface across central and eastern Navarro County and dips southeast at about 40–100 ft per mile, so depth swings widely — roughly 100 ft near the surface to about 800 ft farther southeast. Around Corsicana, home wells typically run 150–300 ft but yield little, commonly 10–15 gpm.
Taylor Group / Austin Chalk / Eagle Ford / Woodbine: These sit deep below and are not dependable modern home targets in Navarro County.
Trinity Group: Very deep and brackish (slightly salty, needs treatment); not a home target.
Carrizo-Wilcox (Carrizo Formation, Wilcox Group): A major aquifer regionally, but it reaches Navarro County only in the far southeast corner near the Freestone and Henderson county lines. In that small area its water is generally better than the Nacatoch.

Navarro County Quick Facts

Primary Aquifer: Nacatoch Sand
Typical Well Depth: 100–800 ft
Groundwater District: No GCD — TDLR standards only
Confinement: outcrop across central and eastern Navarro County; dips SE at roughly 40–100 ft/mile

Water Quality Notes

Nacatoch water is alkaline and sodium-rich (sodium-bicarbonate type), so it is soft rather than hard
Total dissolved solids (TDS, how mineral-heavy water is) commonly run 500–1,500 mg/L, rising as the layer dips deeper (downdip) toward the southeast
Sulfate and chloride vary across the county, and some older test wells showed heavy mineralization
The county's long oil-and-gas history makes hydrocarbon testing prudent for any new well
In the far southeast near the Freestone and Henderson county lines, water from the Carrizo-Wilcox where it surfaces (its outcrop) is generally better than the Nacatoch, though iron and manganese can run high locally

City We Serve in Navarro County

Corsicana, TX

Licensed well drilling and pump service in Corsicana and Navarro County, where no local GCD operates and TDLR standards govern all well construction.

View Corsicana details →

What's Under Navarro County: the Geology Story

Drilling in Navarro County means starting in topsoil, working through Navarro Group clays and marls (Corsicana Marl, Kemp Clay), to reach the Nacatoch Sand — the producing zone for most domestic wells.

The full layer-by-layer stratigraphy is laid out under the cube above. Well depth in Navarro 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 Navarro County

Navarro County sits outside all groundwater conservation districts. TDLR well construction standards govern, and your driller must be TDLR-licensed.

Full Navarro County permit & regulations →

Frequently Asked Questions about Navarro County Wells

What aquifer is under Navarro County?

Navarro County wells primarily produce from the Nacatoch Sand aquifer system (outcrop across central and eastern Navarro County; dips SE at roughly 40–100 ft/mile). Carrizo-Wilcox (far SE corner of the county only) is a secondary target in parts of the county.

How deep are wells typically drilled in Navarro County?

Most residential wells in Navarro County are completed between 100 and 800 feet, depending on the specific location within the county and the producing formation. Your driller can review TWDB well records for neighboring properties to refine the expected depth before drilling.

What water quality issues are common in Navarro County wells?

Nacatoch water is alkaline and sodium-rich (sodium-bicarbonate type), so it is soft rather than hard. Total dissolved solids (TDS, how mineral-heavy water is) commonly run 500–1,500 mg/L, rising as the layer dips deeper (downdip) toward the southeast. Sulfate and chloride vary across the county, and some older test wells showed heavy mineralization. The county's long oil-and-gas history makes hydrocarbon testing prudent for any new well. In the far southeast near the Freestone and Henderson county lines, water from the Carrizo-Wilcox where it surfaces (its outcrop) is generally better than the Nacatoch, though iron and manganese can run high locally. Water testing after drilling — and periodically thereafter — is recommended for every private well in the county.

Does Navarro County require a permit to drill a water well?

Navarro County sits outside every groundwater conservation district (a GCD — the local body that would otherwise permit wells), so no local drilling permit is required. TDLR well construction standards still apply, and your driller must be TDLR-licensed.

What's the main producing formation in Navarro County?

The primary producing formation is the Nacatoch Sand — The principal local water source. It reaches the surface across central and eastern Navarro County and dips southeast at about 40–100 ft per mile, so depth swings widely — roughly 100 ft near the surface to about 800 ft farther southeast. Around Corsicana, home wells typically run 150–300 ft but yield little, commonly 10–15 gpm. Most Navarro County residential wells are completed in this interval.

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