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How deep are water wells in Alvin, Texas?

Home water wells in and around Alvin, Texas are typically 180 to 460 feet deep (median 365 ft, 1,745 wells drilled in the last 10 years). All the wells the model covers draw from the Chicot Aquifer, according to the state's northern Gulf Coast Aquifer model (TWDB). New wells run about 17% deeper than 20 years ago (median 324 ft in 2003 to 2007, 380 ft in 2021 to 2025). Estimated cost of a complete well at the median depth: $11,500 to $28,500.

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 pointBrazoria County
What is under Alvin, TexasUnderground column at the center of Alvin: median well 365 ft, middle half 180 to 460 ft, water at 87 ft, and the layers of the state's model with their thickness.Chicot: 0 to 1,424 ftChicotcontinues to 8,877 ft0200400600800ftGround level · 57 ft above sea levelMedian well: 365 ftWater standing in the well from 87 ftWater level87 ftMiddle half180–460 ftMedian well365 ft

Under Alvin, Brazoria County

Layers at the center of Alvin from TWDB's northern Gulf Coast Aquifer model (cells of about 0.62 mile (1 km)), at true depth scale. The well and the water are the median of 1,745 real wells.

Home wells in and around Alvin

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: Alvin and about 2 miles around it

Key figures

Typical depth (middle half)
180 to 460 feet
Median depth
365 feet
Deepest 10% are past
571 feet
Water level (median)
87 feet
1,696 wells
Yield (median)
65 gpm
1,171 wells, gallons per minute
Wells used
1,745
In the last 10 years
Inside the city limits
81
the rest within 2 miles
All years on file
4,935
median 342 ft, since 2000
Confidence
Standard (30 or more wells)

When the wells were finished, the water stood a median 87 feet below the surface (1,696 wells), well above the bottom: the typical well holds about 278 feet of water.

What is under Alvin, TexasUnderground column at the center of Alvin: median well 365 ft, middle half 180 to 460 ft, water at 87 ft, and the layers of the state's model with their thickness.Chicot: 0 to 1,424 ftChicotcontinues to 8,877 ft0200400600800ftGround level · 57 ft above sea levelMedian well: 365 ftWater standing in the well from 87 ftWater level87 ftMiddle half180–460 ftMedian well365 ft
Layers at the center of Alvin from TWDB's northern Gulf Coast Aquifer model (cells of about 0.62 mile (1 km)), at true depth scale. The well and the water are the median of 1,745 real wells.

Which formation do wells in Alvin draw from?

All the wells the model covers draw from the Chicot Aquifer, according to the state's northern Gulf Coast Aquifer model (TWDB).

Layer (state's model)ShareWellsTypical depth (ft)
Chicot100%1,745180–460

For 83% of these wells the report says where the water enters and we use the middle of that interval; for the rest we use the bottom of the hole, which tends to read one layer too deep.

The layers under the center of Alvin

From the state's model, at 57 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)
Chicotsand, silt and clay01,4241,424
Evangelinesand and clay1,4243,5432,118
Jasper, Catahoula and Burkevillesand, sandstone, clay and volcanic tuff3,5438,8775,335

Depth over time

New home wells in and around Alvin are deeper than 20 years ago: the median went from 324 feet (2003 to 2007) to 380 feet (2021 to 2025), 17% more. Deeper wells do not always mean the water dropped: a driller may be going for another layer, better water or more reserve.

PeriodMedian depth (ft)Wells
2001–20053161,011
2006–20103261,091
2011–2015300903
2016–20203501,003
2021–2025380835
202639491

What a well costs in Alvin

At the median depth for Alvin (365 feet), a complete home well would cost roughly $11,500 to $28,500: $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 (180 to 460 feet) the range runs from $7,000 to $34,000. 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 Alvin, Texas?

Home water wells in and around Alvin, Texas are typically 180 to 460 feet deep (median 365 ft, 1,745 wells drilled in the last 10 years). One in ten goes past 571 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 Alvin draw from?

All the wells the model covers draw from the Chicot Aquifer, according to the state's northern Gulf Coast Aquifer 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 Alvin?

At the median depth (365 feet), a complete well would cost roughly $11,500 to $28,500, 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 Alvin?

When the wells were finished, the water stood a median 87 feet below the surface (1,696 wells), well above the bottom: the typical well holds about 278 feet of water. The level moves with drought and from one well to the next.

Do I need a permit to drill a well in Alvin?

Alvin is inside the Brazoria County Groundwater Conservation District. 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 83% of these wells the report says where the water enters and we use the middle of that interval; for the rest we use the bottom of the hole, which tends to read one layer too deep.

How well it works: In 14,333 wells in the area of the state's northern Gulf Coast Aquifer model (Houston and Southeast Texas) where the State of Texas recorded the aquifer, the formation our method says the well draws from (as grouped on these pages) is the one the state recorded in about 83% of them, and that formation or the one next to it in at least 99%; of the 3,578 of those wells that the state records in the Evangeline, it names the Evangeline for about 51% and the Chicot for most of the rest.

  • The layers come from the Texas Water Development Board's northern Gulf Coast Aquifer model, with cells of about 0.62 mile (1 km). It is a regional model, not a survey of any lot.
  • The state's model has cells of about 3,277 ft (1 km, 0.62 mile); we read it on a grid of about 0.6 by 0.7 miles. It is not a survey of any lot, so we give ranges.
  • Figures go by three groups: Chicot, Evangeline, and Jasper and Catahoula with the Burkeville. The state's records cannot tell the Burkeville, the Jasper and the Catahoula apart at a well (alone, the Burkeville matched 33% and the Catahoula 50%), so they are never named one by one as the formation of a well or a place.
  • The line between the Chicot and the Evangeline is drawn differently by different studies. The state's records put about half of their Evangeline wells in what the model draws as the Chicot, mostly deeper wells in Harris, Montgomery, Waller, Liberty and Austin counties. Where both appear, the split is approximate.
  • "Near or below the base" means the well ends near or below the base of the Gulf Coast Aquifer (under the Catahoula: Jackson Group, Yegua and older). It is 1.3% of home wells; half of them end within about 85 ft of the base. That is not an error: the model simply ends there.
  • The model's top layer is a uniform 49 ft slab for the water table zone, not a rock unit; we merge it into the unit beneath. The model also covers Colorado, Lavaca, Fayette, Wharton and Matagorda counties (outside Groundwater Management Area 14), with the same framework. Texas part only.
  • 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/alvin-tx. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.

Sources