How Deep is the Water Table in Your County? Drilling Costs & Well Depths
Access official hydrogeological well logs, static water levels, estimated GPM flow rates, and certified drilling costs per foot across 50 US States and 3,143 counties. Zero guesswork for homeowners, homesteaders, and agricultural developers.
US Groundwater & Well Drilling Directory by State
Click on any state to view county-level well logs, aquifer formations, and certified drillers.
| State & Code ⬍ | Median Depth (ft) ⬍ | Static Water Level ⬍ | Cost / Foot (Avg) ⬍ | Complete System Avg ⬍ | Typical GPM ⬍ | Primary Aquifer | Action |
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Interactive Water Well Drilling Cost Calculator
Calculate your estimated turnkey drilling cost based on expected depth, casing diameter, and pump horsepower.
Major Principal Aquifers of the United States
Overview of primary regional groundwater formations, lithology, and drilling depth characteristics.
Underlying 174,000 sq miles across Texas, Kansas, Nebraska, Colorado, Oklahoma, New Mexico, South Dakota, and Wyoming. Unconfined sand and gravel formation yielding high flow rates.
Spanning Florida, southern Georgia, Alabama, and South Carolina. High-yield karst limestone and dolomite formation providing exceptionally high flow rates.
Extending through Sacramento and San Joaquin Valleys. Deep alluvial sand and gravel interbedded with clay layers; heavily managed for agricultural and domestic supply.
Frequently Asked Questions About Drilling a Water Well
How do I know how deep to drill for water on my property?
Well depth is governed by your local hydrogeology. In the US, surrounding well completion reports (Well Logs) filed with the State Department of Natural Resources and USGS NWIS monitoring stations provide accurate neighborhood averages. You can look up your county in our directory above to see median drilled depths.
What is the minimum required distance between a water well and a septic tank?
Most US states require a minimum setback of 100 feet between a residential water well and a septic tank or drainfield (some states allow 75 feet with specialized sanitary grout seals). Wells must also be at least 10–25 feet away from property lines and 50 feet from sewer lines.
What is a good GPM (Gallons Per Minute) for a residential household?
For a standard 3–4 bedroom home, a flow rate of 8 to 12 GPM is ideal. If your well yields between 3 and 5 GPM, you can install an auxiliary atmospheric storage tank (500–1,500 gallons) with a booster pump to supply peak morning demand seamlessly.