Water Well Drilling in Callahan County, TX
Callahan County records offer useful depth history, but they do not predict one property. The newer Submitted Drillers Reports and the historical Groundwater Database show different domestic depth patterns, so each record set needs its own context.
Start with the property location, nearby comparable records, intended water use, and current requirements before discussing a drilling plan.
- Separate SDR and historical GWDB context
- Address-level neighboring-well research
- Current-rule verification before drilling or platting
Bring the property into the picture
County records become more useful when they are filtered around an address and compared by well use.
What Callahan County domestic records show
The newer Submitted Drillers Report dataset contains 311 domestic records with usable total-depth fields. The median reported depth is 60 feet. The middle 50% runs from 50 to 100 feet, while the 10th to 90th percentile range runs from 40 to 150 feet.
The historical Texas Water Development Board Groundwater Database contains 158 domestic records, including 155 with usable depth fields. In that dataset, the domestic median is 45 feet. The middle 50% runs from 28 to 76 feet, and the 10th to 90th percentile range runs from 18 to 110 feet.
| Record set | Domestic depth records | Median reported depth | Middle 50% | 10th to 90th percentile |
|---|---|---|---|---|
| Submitted Drillers Reports | 311 | 60 ft | 50 to 100 ft | 40 to 150 ft |
| Historical TWDB Groundwater Database | 155 usable depths among 158 domestic records | 45 ft | 28 to 76 ft | 18 to 110 ft |
Record age changes the comparison
The county record sets span different eras. The table below groups records into coarse year ranges and keeps the two datasets separate. Newer records may better reflect current reporting practices, but record age alone does not make one well comparable to another.
| Record set | Coarse record years | All records | Domestic records | Domestic median depth |
|---|---|---|---|---|
| SDR | 2001–2009 | 238 | 86 | 67 ft |
| SDR | 2010–2019 | 477 | 170 | 60 ft |
| SDR | 2020–2026 | 266 | 51 | 80 ft |
| SDR | Year unavailable | 8 | 4 | 102 ft |
| Historical GWDB | Before 1950 | 87 | 32 | 28 ft |
| Historical GWDB | 1950–1969 | 274 | 87 | 51 ft |
| Historical GWDB | 1970–1989 | 80 | 16 | 53 ft |
| Historical GWDB | 1990–2009 | 8 | 0 | Not available |
| Historical GWDB | Year unavailable | 108 | 23, including 20 usable depths | 23 ft |
These are records in the dataset, not a census of Callahan County wells. The two databases cover different record populations and should not be merged into a single average. Their ranges describe reported history, not a guaranteed depth for a new well.
Trinity dominates the Callahan County record context
The historical GWDB subset contains 557 Callahan County records. Trinity is the aquifer label on 503 of them, or 90.3%. That makes Trinity the dominant county record signal.
Cross Timbers, other, and unassigned aquifer labels also appear in the records. The county is not geologically uniform, and a countywide percentage cannot confirm the aquifer beneath a particular parcel.
Current mapping, coordinates, nearby logs, topography, and a qualified driller’s site review all belong in the property-level conversation. The record history cannot promise aquifer presence, completed depth, water level, water quality, yield, or drilling success.
No GCD was identified in the dated check, but other rules still matter
As checked August 31, 2026, Callahan County was not identified in the current TCEQ groundwater conservation district contact list. The TWDB Groundwater Database extract also labels Callahan records as GCD Does Not Exist.
That is a dated jurisdiction finding, not permission to drill without review. District boundaries and jurisdiction can change. Confirm the parcel in the current TWDB groundwater conservation district directory and TCEQ PGMA and GCD viewer on the day the project moves forward.
State well-construction standards still apply. County development rules may also apply based on the location and project type:
- Subdivision projects: Callahan County’s subdivision regulations, approved March 23, 2026, apply outside incorporated-city boundaries. Proposed subdivisions using on-site sewage facilities must address site planning, water-well locations, drainage, soil, floodplain, easements, and groundwater compatibility. The county rules also address approval of an individual well location before occupancy for an individual-supply development.
- Groundwater-availability certification: Effective January 1, 2024, counties and municipalities must require groundwater-availability certification for proposed subdivisions that will rely on groundwater, subject to statutory exemptions. Confirm the current forms and exemptions with the plat authority and state sources.
- RV parks: Callahan County’s RV-park infrastructure rules, adopted October 14, 2025, require adequate-groundwater certification when a development proposes private groundwater. Projects that meet the public-water-system definition face additional TCEQ review.
- OSSF review: Well placement and the proposed on-site sewage plan need to be considered together. Confirm current separation and site-plan requirements for the specific tract.
These development rules do not prove that every replacement well or single-lot domestic project follows the same certification path. Verify the parcel, project class, and current county and state requirements before drilling, altering a well, buying land for development, or filing a plat.
What to review before setting a drilling budget
Nearby comparable records
Compare records near the property by use, date, reported depth, and available completion details. A domestic record is a better starting comparison for a homesite than an irrigation, stock, monitoring, test, or environmental record.
The intended water demand
A house, livestock operation, irrigation plan, or mixed-use tract may call for different equipment and storage. Record depth alone does not establish whether a well can meet that demand.
Site access and layout
Roads, gates, slopes, overhead lines, buried utilities, existing structures, septic planning, and room for equipment affect the practical scope.
Current approvals and licensed work
Confirm the project class with the county and current state sources. Use appropriately licensed professionals for regulated well work, site evaluation, engineering, and certification.
Review the records around the tract, not just the mailing city
Callahan County records include address labels around Baird, Clyde, Cross Plains, Putnam, Eula, Oplin, Cottonwood, Atwell, Dudley, and Rowden. Smaller place names and mailing-city fields do not always establish the exact location of a well.
For property near any of these areas, use coordinates and nearby logs rather than relying on a city label alone. That keeps the comparison tied to the tract and avoids treating a mailing address as a geologic boundary.
Narrow the research to one Callahan County property
The Pre-Drill Intelligence Report organizes available neighboring records, aquifer context, and regulatory questions around a property location. It is designed to help buyers and landowners ask better questions before comparing drilling scopes or committing to a development plan.
The report can include:
- Nearby well records filtered around the property
- Reported depths and uses for relevant comparisons
- Aquifer context for the property area
- Groundwater district and county-rule checkpoints
- Questions to raise with the driller, engineer, county, or plat authority
The report does not guarantee depth, water level, water quality, yield, aquifer presence, approval, or drilling success.
Prepare before you commit
Identify the tract
Start with the address or coordinates, intended water use, and any existing well information.
Compare relevant records
Keep SDR and historical GWDB findings separate, then focus on nearby records with a comparable use.
Verify the current rules
Confirm district status, county requirements, state standards, OSSF considerations, and any certification duty for the project class.
Direct answers from the available records
What do domestic depth records show in Callahan County?
The newer SDR domestic dataset has a median reported depth of 60 feet, with a middle 50% of 50 to 100 feet and a 10th to 90th percentile range of 40 to 150 feet. The historical GWDB domestic dataset has a median of 45 feet, a middle 50% of 28 to 76 feet, and a 10th to 90th percentile range of 18 to 110 feet. The datasets cover different record populations and should not be combined.
Which aquifer is most common in Callahan County records?
Trinity is the dominant label in the historical GWDB subset, appearing on 503 of 557 Callahan County records, or 90.3%. That county-level pattern does not confirm the aquifer under one parcel.
Is Callahan County inside a groundwater conservation district?
As checked August 31, 2026, Callahan County was not identified in the current TCEQ GCD contact list, and the TWDB GWDB extract labels Callahan records as GCD Does Not Exist. Confirm the parcel in current TWDB and TCEQ district resources because boundaries and jurisdiction can change.
Does no identified GCD mean no approval is needed?
Not necessarily. State well-construction standards still apply, and county subdivision, RV-park, OSSF, platting, and groundwater-certification requirements may apply depending on the property and project. Confirm the current rules with the appropriate county and state offices.
Can county records predict water quality or yield?
No. A recorded depth or aquifer label does not promise potable quality, water level, yield, aquifer presence, or drilling success on another tract. Property-specific research and qualified professional evaluation are still needed.
What should I check before buying land that may need a well?
Review neighboring well records, current aquifer mapping, site access, intended demand, septic plans, and the current district, county, and state requirements. For a subdivision or RV-park project, confirm the applicable certification and platting steps before relying on groundwater as the planned supply.
Start with the address and the records around it
Use the Well Check to identify available property context, or order a Pre-Drill Intelligence Report for a deeper address-level review before you commit to the next step.