Setback Requirements for Water Wells in Texas
Quick Answer
Texas requires wells to be set back from septic systems and other contamination sources. State minimums apply statewide; GCDs add spacing rules between wells.
One of the most overlooked aspects of water well planning is location. The rules governing where a well can be placed — relative to your septic system, fuel storage, property lines, and neighboring wells — come from two separate bodies of rules that must both be satisfied.
Two Sets of Setback Rules
1. TDLR Construction Standards (Your Well vs. On-Site Contamination Sources)
Texas Department of Licensing and Regulation rules under 16 TAC §76.100 set the minimum horizontal distances between a Class 1 (private domestic) water well and potential contamination sources on the property. These apply statewide.
| Contamination Source | Minimum Distance | Citation |
|---|---|---|
| Septic tank (watertight) | 50 feet | 16 TAC §76.100(a)(2) |
| Septic drain field / spray field | 100 feet | 16 TAC §76.100(a)(1) |
| Livestock or poultry yards, manure storage | 150 feet | 16 TAC §76.100(a)(1) |
| Pesticide mixing or loading sites | 150 feet | 16 TAC §76.100(a)(1) |
| Cemeteries | 150 feet | 16 TAC §76.100(a)(1) |
| Petroleum storage tanks | 150 feet | TCEQ/TDLR guidance |
| Property line (standard) | 50 feet | 16 TAC §76.100(a)(1) |
| Property line (with pressure-cemented surface casing to 100 ft) | 5 feet | 16 TAC §76.100(b)(2) |
The pressure-cementing exception at the property line is the most common path forward on small lots. By extending the surface casing cement seal to 100 feet of depth, the construction compensates for the reduced horizontal buffer.
Wellhead Construction Heights
Setback distances are one half of the contamination defense; the wellhead itself is the other. TDLR rules under 16 TAC §76.100(f)(4) set the minimum casing height above natural ground surface for a Class 1 domestic well at 12 inches. In areas prone to flooding, 16 TAC §76.105 requires the casing extend at least 36 inches above ground level, with all openings sealed watertight.
| Condition | Minimum Wellhead Height | Citation |
|---|---|---|
| Standard Class 1 domestic | 12 inches | 16 TAC §76.100(f)(4) |
| Flood-prone areas | 36 inches | 16 TAC §76.105(C) |
| Public water supply wells | 18 inches | 30 TAC §290.41 |
Many North Texas properties along ephemeral creeks and drainage ditches qualify as flood-prone for wellhead-height purposes. If you are unsure whether your property triggers the 36-inch rule, check the FEMA flood map and discuss with your driller during site evaluation.
2. GCD Spacing Rules (Your Well vs. Neighboring Wells)
If your county has a Groundwater Conservation District, the GCD also sets spacing rules — minimum distances between your proposed well and existing wells on neighboring properties or on your own property.
GCD spacing rules protect the aquifer from concentrated over-pumping in a small area. They are not contamination setbacks — they govern well-to-well distances.
| GCD | Counties | Spacing Rules |
|---|---|---|
| North Texas GCD | Collin, Cooke, Denton | Contact district for current spacing requirements |
| Upper Trinity GCD | Wise, Parker, Hood | Contact district for current spacing requirements |
| Red River GCD | Grayson, Fannin | Contact district for current spacing requirements |
| Prairielands GCD | Johnson, Ellis, Somervell | Contact district for current spacing requirements |
| Northern Trinity GCD | Tarrant | Domestic <20 gpm: 200 ft well-to-well; high-capacity ≥100 gpm: 2,500 ft |
| Middle Trinity GCD | Erath | Contact district for current spacing requirements |
| No GCD | Dallas, Kaufman, Rockwall, Hunt, Navarro, Palo Pinto | TDLR standards only |
Planning Your Well Location
Before you mark a spot for the well on your site map, your driller should know:
- Septic system location — tank, drain field, and any spray field
- Fuel storage — above-ground or underground tanks, including diesel tanks at outbuildings
- Chemical storage — pesticide storage, fertilizer tanks
- Livestock facilities — pens, barns, feed areas
- Neighboring well locations — visible wellheads on adjacent properties
- Property lines — especially on smaller parcels
A good driller will walk the site with you and identify the compliant options before proposing a drilling location. Discovering a setback conflict after the rig is mobilized is expensive.
When a Variance Is Needed
If no compliant location exists on the property, or if the only feasible location requires a GCD spacing waiver, a variance application can be filed with the GCD. Variances require:
- Documentation of the setback conflict and why relocation isn’t feasible
- District board review (some districts have a formal variance hearing)
- Additional processing time — plan for 30–60 days beyond normal permit timelines
We assess setback compliance as part of every site evaluation. Call us before committing to a well location — it’s much easier to identify conflicts before the permit is filed than after.