How deep are water wells in Marathon, Texas?
Only 18 home water wells in and around Marathon, Texas have been reported since 2001, so treat this as a rough guide: the middle half are 226 to 356 feet deep (median 301 ft). Estimated cost of a complete well at the median depth: $10,000 to $24,500.
This page is based on fewer than 30 wells, so it is kept out of search engines until more reports come in. Treat every figure as a rough guide.
Updated every day from Texas Water Development Board driller reports. Last update: November 11, 2026, using the state file of November 10, 2026.
Under Marathon, Brewster County
The well and the water are the median of 18 real wells. This atlas does not have a state layer model for this area yet.
Digging in…
Home wells in and around Marathon
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.
Well depth (ft)
- <100
- 100
- 200
- 300
- 400
- 600
- 800+
Dashed line: Marathon and about 2 miles around it
Green: aquifer mapped by the state
Key figures
- Typical depth (middle half)
- 226 to 356 feet
- Median depth
- 301 feet
- Deepest 10% are past
- 401 feet
- Water level (median)
- 134 feet
- 17 wells
- Yield (median)
- 35 gpm
- 16 wells, gallons per minute
- Wells used
- 18
- Since 2001
- Inside the city limits
- 17
- the rest within 2 miles
- All years on file
- 18
- median 301 ft, since 2004
- Confidence
- Few wells (10 to 29)
When the wells were finished, the water stood a median 134 feet below the surface (17 wells), well above the bottom: the typical well holds about 167 feet of water.
Which formation do wells in Marathon draw from?
We cannot say yet for Marathon. This atlas assigns layers with the TWDB layered models processed so far (the Northern Trinity and Woodbine model, the Hill Country Trinity model, the northern Gulf Coast Aquifer model and the High Plains Aquifer System model), and none covers this area with enough wells. The depth, water level and yield on this page do come from the real wells here.
Depth over time
Too few wells per period in and around Marathon to compare depth over time. Since 2004, 18 home wells have been reported, with a median of 301 feet.
| Period | Median depth (ft) | Wells |
|---|---|---|
| 2001–2005 | under 10 wells | 2 |
| 2006–2010 | under 10 wells | 6 |
| 2011–2015 | under 10 wells | 3 |
| 2016–2020 | under 10 wells | 3 |
| 2021–2025 | under 10 wells | 4 |
What a well costs in Marathon
At the median depth for Marathon (301 feet), a complete home well would cost roughly $10,000 to $24,500: $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 (226 to 356 feet) the range runs from $8,000 to $28,000. 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
- Wells in Brewster County
- Brewster County Groundwater Conservation District (groundwater district)
- Unincorporated community (Census-designated place) · 30.2157, -103.2433
Nearby places
Median depth of home wells in each place.
- Alpine 300 ft
- Fort Davis 172 ft
- Marfa 304 ft
- Fort Stockton 235 ft
Common questions
How deep do you have to drill a well in Marathon, Texas?
Only 18 home water wells in and around Marathon, Texas have been reported since 2001, so treat this as a rough guide: the middle half are 226 to 356 feet deep (median 301 ft). One in ten goes past 401 feet. The depth a given tract needs depends on where it sits and what layers the driller hits.
How much does a water well cost in Marathon?
At the median depth (301 feet), a complete well would cost roughly $10,000 to $24,500, 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 Marathon?
When the wells were finished, the water stood a median 134 feet below the surface (17 wells), well above the bottom: the typical well holds about 167 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 Marathon?
Marathon is inside the Brewster 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.
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/marathon-tx. License CC BY 4.0. https://doi.org/10.5281/zenodo.24126380.
Sources
- Submitted Driller's Reports database, Texas Water Development Board (TWDB) (file of November 10, 2026)
- Texas place boundaries, U.S. Census Bureau (2023 cartographic boundary file)
- Ground elevation: Terrain Tiles (Mapzen), Registry of Open Data on AWS
- TWDB well report viewer (each well's official report)