How deep are water wells in Collin County, Texas?
Half of the home water wells drilled in Collin County in the last 10 years are between 825 and 1,424 feet deep. The median is 1,020 feet, based on 50 driller reports filed with the state. Drillers measured the water standing a median 500 feet below the surface (33 wells). That is deeper than the Texas median of 250 feet.
Updated every day from Texas Water Development Board driller reports. Last update: November 10, 2026, using the state file of November 9, 2026. 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.
Key figures
- Typical depth (middle half)
- 825 to 1,424 ft
- Median depth
- 1,020 feet
- Deepest 10% are past
- 1,561 feet
- Water level (median)
- 500 feet (33 wells)
- Yield (median)
- 17 gallons per minute (50% pump-tested)
- Wells used
- 50
- Period
- Last 10 years
- Latest report
- August 23, 2026
- Depth rank
- 2 of 245 (1 = deepest)
- Confidence
- Standard
How deep the wells are
Number of home wells by depth, last 10 years (or since 2001 where wells are few).
| Depth (ft) | Wells |
|---|---|
| 50 to 100 | 1 |
| 300 to 350 | 1 |
| 350 to 400 | 1 |
| 400 to 450 | 3 |
| 450 to 500 | 1 |
| 600 to 650 | 1 |
| 650 to 700 | 1 |
| 700 to 750 | 2 |
| 750 to 800 | 1 |
| 800 to 850 | 2 |
| 850 to 900 | 1 |
| 900 to 950 | 4 |
| 950 to 1,000 | 5 |
| 1,000 to 1,250 | 11 |
| 1,250 to 1,500 | 5 |
| 1,500 to 2,000 | 9 |
| 2,000 to 5,000+ | 1 |
Median depth by year
Median depth of home wells finished each year. Years with fewer than 10 wells are not shown.
| Year | Median (ft) | Wells |
|---|---|---|
| 2004 | 75 | 11 |
Are wells in Collin County getting deeper?
Collin County does not have enough domestic wells in both 2003 to 2007 and 2021 to 2025 (at least 30 in each) to compare. Read the 20-year study.
Aquifers under the county
The Texas Water Development Board maps the Trinity, a major aquifer, below other rock (subsurface) across 95% of the county; the Woodbine, a minor aquifer, under 83% of the county.
What a well costs in Collin County
At the median depth for Collin County (1,020 feet), a complete home well (drilling, casing, pump, pressure tank and hookup at the well) would cost roughly $28,000 to $67,500, by TerraFunded's estimate from published Texas prices. Trenching and the line to the house are extra. Get quotes from at least two licensed drillers.
Neighboring counties
- Dallas County: median 55 ft
- Denton County: median 440 ft
- Fannin County: median 62 ft
- Grayson County: median 340 ft
- Hunt County: median 216 ft
- Rockwall County
Common questions
How deep do I need to drill a well in Collin County?
The middle half of home wells drilled there are 825 to 1,424 feet deep; one in ten goes past 1,561 feet. The depth a given tract needs depends on where it is and what layers the driller hits.
How much does a water well cost in Collin County?
At the median depth (1,020 feet), a complete well would cost roughly $28,000 to $67,500 by TerraFunded's estimate from published Texas driller prices ($25 to $60 per foot plus pump and equipment). The real price comes from a driller's quote.
How much water does a well produce in Collin County?
Drillers reported a median of 17 gallons per minute (40 wells). Only 50% of those figures come from a pump test; the rest are the driller's estimate, so treat them as a guide.
Are wells in Collin County getting deeper?
Collin County does not have enough domestic wells in both 2003 to 2007 and 2021 to 2025 (at least 30 in each) to compare.
How do I see the well report for a property or a neighbor's well?
Every well drilled in Texas since 2001 has a public driller's report. On this page's map, tap a well to open its official report on the state's site, or look it up by location in the TWDB viewer.
How to read these numbers
Figures cover new and replacement domestic (home) wells, from the reports licensed drillers file with the state. Read the full methodology. Download the county table (CSV).
How to cite: TerraFunded Texas Well Atlas, from Texas Water Development Board driller reports (data as of November 9, 2026). https://terrafunded.com/wells
Sources
- Texas Water Development Board, Submitted Driller's Reports database (file of 2026-11-10)
- U.S. Census Bureau, 2024 cartographic boundary file, counties (1:500,000) (file of 2025-04-10)
- Texas Water Development Board, major aquifers (updated December 2006) (file of 2007-01-03)
- Texas Water Development Board, minor aquifers (updated December 2017) (file of 2017-12-15)
- TWDB well report viewer