Skip to content
ENES
Marketplace

How deep are water wells in Grey Forest, Texas?

Home water wells in and around Grey Forest, Texas are typically 700 to 840 feet deep (median 780 ft, 65 wells drilled in the last 10 years). Nearly all draw from the Middle Trinity (88%), according to the state's Hill Country Trinity model (TWDB). Estimated cost of a complete well at the median depth: $22,000 to $53,500.

Updated every day from Texas Water Development Board driller reports. Last update: November 11, 2026, using the state file of November 10, 2026.

See the wells and layers at an exact pointBexar County
What is under Grey Forest, TexasUnderground column at the center of Grey Forest: median well 780 ft, middle half 700 to 840 ft, water at 400 ft, and the layers of the state's model with their thickness.Upper Trinity: 0 to 532 ftUpper TrinityMiddle Trinity: 532 to 1,041 ftMiddle Trinitycontinues to 1,414 ft02004006008001,000ftGround level · 1,203 ft above sea levelMedian well: 780 ftWater standing in the well from 400 ftWater level400 ftMiddle half700–840 ftMedian well780 ft

Under Grey Forest, Bexar County

Layers at the center of Grey Forest from TWDB's Hill Country Trinity model (1 mile cells), at true depth scale. The well and the water are the median of 65 real wells.

Home wells in and around Grey Forest

Each dot is a home well from a state driller report, colored by depth. Tap one for its details and official report. Tap an empty spot to see what is under that point.

See underground

Well depth (ft)

  • <100
  • 100
  • 200
  • 300
  • 400
  • 600
  • 800+

Dashed line: Grey Forest and about 2 miles around it

Key figures

Typical depth (middle half)
700 to 840 feet
Median depth
780 feet
Deepest 10% are past
926 feet
Water level (median)
400 feet
55 wells
Yield (median)
30 gpm
48 wells, gallons per minute
Wells used
65
In the last 10 years
Inside the city limits
0
the rest within 2 miles
All years on file
204
median 734 ft, since 1994
Confidence
Standard (30 or more wells)

When the wells were finished, the water stood a median 400 feet below the surface (55 wells).

What is under Grey Forest, TexasUnderground column at the center of Grey Forest: median well 780 ft, middle half 700 to 840 ft, water at 400 ft, and the layers of the state's model with their thickness.Upper Trinity: 0 to 532 ftUpper TrinityMiddle Trinity: 532 to 1,041 ftMiddle Trinitycontinues to 1,414 ft02004006008001,000ftGround level · 1,203 ft above sea levelMedian well: 780 ftWater standing in the well from 400 ftWater level400 ftMiddle half700–840 ftMedian well780 ft
Layers at the center of Grey Forest from TWDB's Hill Country Trinity model (1 mile cells), at true depth scale. The well and the water are the median of 65 real wells.

Which formation do wells in Grey Forest draw from?

Nearly all draw from the Middle Trinity (88%), according to the state's Hill Country Trinity model (TWDB).

Layer (state's model)ShareWellsTypical depth (ft)
Middle Trinity88%57720–840
Upper Trinity12%8300–898

For 99% of these wells the report says where the water enters (the screen or the open hole), and we use the middle of that interval.

The layers under the center of Grey Forest

From the state's model, at 1,203 feet above sea level. These are the model's depths at that one point, not those of any particular lot.

Depths in feet below ground.
Layer (state's model)Top (ft)Bottom (ft)Thickness (ft)
Upper Trinitylimestone and marl0532532
Middle Trinitylimestone and sand5321,041509
Lower Trinitysand and limestone1,0411,414374

Depth over time

Home well depth in and around Grey Forest has not changed meaningfully in 20 years: the median was 710 feet in 2003 to 2007 and 740 feet in 2021 to 2025 (a difference under 10% or within the margin of error).

PeriodMedian depth (ft)Wells
2001–200564039
2006–201073061
2011–201572832
2016–202081022
2021–202574042
2026under 10 wells6

What a well costs in Grey Forest

At the median depth for Grey Forest (780 feet), a complete home well would cost roughly $22,000 to $53,500: $25 to $60 per foot for drilling, casing and seal, plus $2,500 to $6,500 for the pump, pressure tank, controls and hookup at the well. Across the whole middle half of depths (700 to 840 feet) the range runs from $20,000 to $57,000. This is TerraFunded's estimate from published Texas prices, not a quote, and it leaves out trenching and the line to the house. Get prices from at least two licensed drillers.

Where it sits

Nearby places

Median depth of home wells in each place.

All Texas cities and towns

Common questions

How deep do you have to drill a well in Grey Forest, Texas?

Home water wells in and around Grey Forest, Texas are typically 700 to 840 feet deep (median 780 ft, 65 wells drilled in the last 10 years). One in ten goes past 926 feet. The depth a given tract needs depends on where it sits and what layers the driller hits.

What aquifer or formation do wells in Grey Forest draw from?

Nearly all draw from the Middle Trinity (88%), according to the state's Hill Country Trinity model (TWDB). This is an estimate from the state's regional model, not a survey of the lot.

How much does a water well cost in Grey Forest?

At the median depth (780 feet), a complete well would cost roughly $22,000 to $53,500, by TerraFunded's estimate from published Texas driller prices. The real price comes from a licensed driller's quote.

How deep is the water in Grey Forest?

When the wells were finished, the water stood a median 400 feet below the surface (55 wells). The level moves with drought and from one well to the next.

Do I need a permit to drill a well in Grey Forest?

Grey Forest is inside the Edwards Aquifer Authority. Groundwater conservation districts in Texas can require registering or permitting a new well, keeping set distances from property lines and other wells, and paying fees. Rules differ from district to district: ask the district before drilling.

How these numbers are made

We count new and replacement domestic (home) wells whose coordinates fall inside the place boundary or within 2 miles of it. We use the last 10 years when there are at least 30 wells; otherwise all since 2001. The median is the middle well and the middle half runs from the 25th to the 75th percentile.

To tell which layer a well draws from, we take the ground elevation at its location, subtract the depth of the interval where water enters (or the bottom of the hole when the report does not give one) and see which layer of the state's model that point falls in.

For 99% of these wells the report says where the water enters (the screen or the open hole), and we use the middle of that interval.

How well it works: In 2,665 wells in the Texas Hill Country where the State of Texas recorded the aquifer, our estimate of the formation the well draws from names the same layer of the state's model in about 76% of them, and that layer or the one next to it in at least 98%.

  • The layers come from the Texas Water Development Board's Hill Country Trinity model, with 1 mile cells. It is a regional model, not a survey of any lot: between one model point and the next, the real depth of each layer can differ.
  • "Near or below the base of the Trinity" means the well reaches the bottom of the model or passes it, often by tens of feet. Older rock that the model does not include may lie there.
  • We never use the model's water levels. The water level on this page is the one each driller measured when the well was finished.

These are depths of real wells drilled nearby, not a promise about any property. Groundwater can change over short distances and with drought. A licensed water well driller can tell you what to expect on a specific tract.

Read the full methodology · Download the data (CSV, CC BY 4.0)

How to cite

TerraFunded (2026). Texas Well Atlas: Underground. From Texas Water Development Board driller reports and groundwater availability models (data as of November 10, 2026). https://terrafunded.com/wells/places/grey-forest-tx. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.

Sources