Tennessee Water Well Depth & Drilling Cost Guide
Authoritative hydrogeological intelligence for Tennessee. Regulated by the Tennessee Department of Environment and Conservation (TDEC). The statewide median drilling depth is 175 feet (ranging 45–480 ft) with an average drilling cost of $36 per foot ($26 to $62/ft).
Quick Hydrogeological Fact Sheet: Tennessee
To reach potable water in Tennessee, residential wells require drilling an average of 175 feet deep. Total turnkey installation costs average $8,400 USD for a completed 6-inch casing well, 1.5 HP submersible pump, pressure tank, and state permits. The standing static water table sits at approximately 35 feet below surface level, producing a reliable average flow rate of 16 GPM across the primary Memphis Sand Aquifer (West TN).
Tennessee County-Level Well Logs & Average Depths
Official USGS hydrogeological monitoring stations, static levels, and driller completion records.
| County Name | Median Depth (ft) | Avg Cost / Foot | Typical Yield | Primary Aquifer | Local Action |
|---|---|---|---|---|---|
| Shelby County (Memphis) | 160 ft | $34 /ft | 35 GPM | Memphis Sand (Claiborne) |
|
| Davidson County (Nashville) | 190 ft | $38 /ft | 14 GPM | Central Basin Limestone |
|
| Knox County (Knoxville) | 220 ft | $40 /ft | 12 GPM | Valley and Ridge Carbonates |
💰 Estimated Turnkey Cost Itemization in Tennessee
Component-by-component breakdown for a standard residential water well (175 ft average).
| System Component | Specification in Tennessee | Unit Cost | Estimated Subtotal |
|---|---|---|---|
| Borehole Drilling & Sanitary Casing | 175 ft depth with standard 6" PVC/Steel Casing & Drive Shoe | $36 /ft | $6,300 USD |
| Submersible Pump & Drop Pipe | 1.0 HP – 1.5 HP Stainless Submersible Pump with 12-gauge electrical drop cable | Turnkey Pump Unit | $2,250 USD |
| Pressure Tank & Control Switch | 40-gallon Captive Air Pressure Tank, 40/60 PSI Pressure Switch & Gauge | Standard Assembly | $1,200 USD |
| State Permits, Sanitary Grouting & Lab Water Testing | Mandatory Tennessee Department of Environment and Conservation (TDEC) permit, bentonite surface seal, and EPA drinking panel | State Fee + Lab | $575 USD |
| TOTAL ESTIMATED TURNKEY INVESTMENT | Includes excavation, drilling, plumbing hookup, and water inspection | $8,400 USD | |
Tennessee Aquifers & Subsurface Geology
Unconsolidated sand in West; limestone/karst in Middle; sandstone/shale in East
Water Quality & Recommended Filtration
⚖️ Tennessee Well Drilling Regulations & Legal Setbacks
Calculate Drilling Cost in Tennessee
Pre-loaded with Tennessee median depth (175 ft) and average cost ($36/ft).
Frequently Asked Questions: Drilling Wells in Tennessee
1. How deep do you usually have to drill for water in Tennessee?
Across Tennessee, the median residential water well is drilled to 175 feet. However, shallow alluvial wells can hit water as high as 45 feet, while deep bedrock or limestone aquifer wells may require drilling down to 480 feet to reach sufficient pressure and yield.
2. How much does a complete water well cost in Tennessee?
On average, homeowners in Tennessee invest $8,400 USD for a complete turnkey system. Drilling alone costs $36 per foot (ranging $26–$62/ft), while submersible pumps, pressure tanks, state permit fees ($125), and electrical hookups comprise the remaining balance.
3. What is the required setback from septic tanks in Tennessee?
State health mandates overseen by the Tennessee Department of Environment and Conservation (TDEC) require a minimum separation distance of 100 feet from any septic tank, leach field, or potential contamination source, plus at least 25 feet from adjacent property boundaries.
4. What is the groundwater quality like in Tennessee?
Wells in Tennessee typically yield water with a hardness reading around 180 PPM and an average pH of 7.4. Key minerals present in natural groundwater include Calcium Hardness in Middle TN, Iron, Bacterial vulnerability in karst. The recommended standard filtration configuration is: UV Disinfection System + Water Softener.
🗺️ Neighboring & Regional Groundwater Guides
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