How deep are water wells near you?

How do you use the well depth lookup?

Enter your land, read the typical depth, then check the range. It takes under a minute, and you do not need to sign up.

1. Enter a place. Type a street address, a town or coordinates. For raw land, zoom the map and click the spot where the well would go.
2. Read the typical depth. This is the median of the recorded wells nearby. Half are shallower and half are deeper.
3. Check the middle range. A tight range means wells around you behave alike. A wide one means geology varies, and your budget should allow for that.
4. Compare depth with water level. The gap between the two tells you how much water stands in a typical well, and it shapes the pump you need.
5. Look at the closest wells. A well one mile away tells you more than a typical figure across ten miles. Click any well to open its USGS record.
6. Price it. The button sends the depth to our well drilling cost calculator, where you can change it.

A worked example: Magnolia, Texas

Magnolia sits in the fast-growing ring northwest of Houston. USGS has 150 wells with a recorded depth within 10 miles, and the median is 271 feet. Half fall between 210 and 440 feet.

That doesn't mean a house well there needs to go 271 feet. Many of those records are deep monitoring and public-supply wells. It does tell you which questions to ask a driller: which sand they target, and how deep their last few house wells finished.

How deep are water wells in each state?

It depends far more on the local aquifer than on the state. For each state we took one growing exurban town and pulled every USGS-recorded well depth around it. The right-hand columns show where that state keeps its own well logs.

Basis: USGS groundwater sites with a recorded depth of up to 2,500 feet within 10 miles of the town, widened to 25 miles where fewer than 10 exist. One town cannot represent a state, and a small well count means a weak figure.

What the pattern says: the shallowest medians in this sample are around Tea, SD (27 ft), Sanford, ME (35 ft), Belgrade, MT (40 ft). The deepest are around Covington, LA (600 ft), Ozark, MO (425 ft), Manhattan, IL (355 ft).

What does this lookup actually show?

It shows wells the US Geological Survey has on record, not every well in the ground. USGS publishes the location, depth and aquifer of the groundwater sites it tracks, plus the water levels it measures there.

The EPA says around 15 percent of the US population, more than 43 million people, rely on private wells for drinking water. Most of those wells are not in the USGS records. They sit in state driller reports, which is why the table above links each state's source.

USGS studies aquifers, so its list leans toward monitoring wells, irrigation wells and public-supply wells. Those can be much deeper than a house needs. Use the figure as the outer shape of what's down there, then narrow it with state logs.

Why do well depths vary so much?

Because a well has to reach water that will keep flowing, and that layer sits at a different depth everywhere. Three things do most of the work.

• The aquifer. Sand and gravel aquifers can give good water from one reliable layer. Your result names the main aquifer nearby.
• Bedrock. Water in hard rock moves through cracks. Two wells close together can finish hundreds of feet apart.
• Local water quality and rules. Drillers may pass through a shallow layer that is salty, polluted or too close to the surface, and states set construction standards.

How do you read a well log?

Find four numbers: total depth, static water level, yield and casing depth. A well log is the driller's report on what they drilled through and what they found.

How deep does a well need to be?

It needs to reach a dependable aquifer, get below surface contamination, and meet state rules. Most home wells today are drilled. Dug wells, about 10 to 30 feet deep, and driven wells, about 30 to 50 feet, draw water closer to the surface and face more risk.

Our shallow vs deep well guide compares the two on safety, pumps and drought. If you are still buying the land, put water near the top of your raw land checklist, right beside the septic soil check.

How much does depth change the cost of a well?

Depth is the biggest number on the quote, because drilling and casing are both priced by the foot. Ground conditions move the per-foot rate, and the pump, tank and wiring come on top.

The well drilling calculator itemizes all of it, and the well drilling cost guide shows where each rate comes from.

What should you do with the result?

• Pull state logs. Look for private wells near your parcel in the table above.
• Call two local drillers. Ask what recent house wells nearby have finished at, and what yield they got.
• Price the high end. Run the calculator at the top of the middle range as well as the median.
• Read the contract. Ask what happens if the well goes deeper than quoted or comes up dry.
• Test the water. The EPA notes that private wells are not regulated under the Safe Drinking Water Act, so testing is on the owner.