Sand Point Well: How Driven Wells Work and Where They Fit

A sand point well is one of the oldest and cheapest ways to reach groundwater: a narrow pipe with a screened tip is driven straight down into saturated sand until it sits below the water table. There is no drill rig and no large borehole. In the right soil, a crew or a determined homeowner can install one in a day, and it can supply irrigation water for decades.

The catch is that driven wells only work in a narrow set of conditions. You need loose sand or fine gravel, a water table within roughly 25 feet of the surface, and no large rocks or clay layers in the way. Because they are shallow, they are also more exposed to surface contamination than a drilled well, so most are used for lawns and gardens rather than drinking water. Before you buy any parts, check with your local health department and building or water authority, since many areas require a permit, a licensed well contractor and water testing for any new well.

How a Sand Point Well Works

The heart of the system is the well point: a hardened tip attached to a short section of slotted or screened pipe, usually 2 to 5 feet long. Water from the surrounding sand flows through the screen while the screen holds most of the sand back. Lengths of 1-1/4 or 2 inch pipe thread onto the point and extend it to the surface, where a pump pulls water up.

Because the pump sits at the surface and pulls by suction, physics limits the practical lift to about 22 to 25 feet at sea level (less at high elevation). That is why driven wells are matched with shallow well jet pumps or pitcher pumps and why they only make sense where the water table is close to the surface. Coastal plains, river valleys, lake regions and outwash sand deposits are the classic places for shallow well point systems.

Where Driven Wells Make Sense

A shallow well point is a good fit when:

• Neighbors already use driven wells successfully and the local water table is known to be shallow.
• The soil is sand or fine gravel. A soil auger test hole that brings up wet sand at 8 to 15 feet is a promising sign.
• The use is irrigation, livestock watering or outdoor washing rather than household drinking water.
• Local rules allow homeowner-installed or contractor-installed driven wells.

It is a poor fit where there is clay, glacial till or bedrock near the surface, where the water table drops sharply in summer, or near septic fields, fuel tanks, livestock yards or road salt runoff. In those cases a drilled well by a licensed contractor is the safer path.

Check Permits and Water Testing Rules First

Rules vary widely by state and county. Some places let homeowners drive irrigation wells with a simple registration. Others require a permit, a licensed well driller, minimum setbacks from septic systems and property lines, a sanitary seal at the surface and a well log filed with the state. Some prohibit new shallow wells entirely in areas with contaminated groundwater.

Call your local health department and the building or water resources office before you start. Ask about setback distances, whether the well must be capped and sealed in a specific way, and whether water testing is required. If there is any chance anyone will drink the water, have it tested at a certified lab for bacteria, nitrates and any local contaminants the health department recommends, and follow their guidance on treatment.

Also call 811 at least a few business days before driving anything into the ground. Buried gas, electric, water and communications lines are often within the depth a well point reaches.

Steel vs PVC Well Points

Galvanized or Stainless Steel Points

Traditional driven wells use a hardened steel tip with a steel or stainless screen, attached to heavy galvanized drive pipe. Steel takes the pounding of a driver and can push through compacted sand and small pebbles. Stainless screens resist corrosion better than brass or galvanized mesh, especially in acidic or iron-rich water.

PVC Well Points

PVC well points are lighter, cheaper and do not corrode, but they cannot be driven with a hammer. They are typically installed by jetting: pumping water down the pipe so the high-pressure stream washes sand away and the pipe sinks under its own weight. Jetting works well in clean, loose sand but fails in gravel or packed soil. PVC points are popular for irrigation in coastal sand regions.

Screen slot size matters for both types. A screen that is too coarse lets sand into the pump; one that is too fine clogs quickly. Local well suppliers usually know which slot size works in their area’s sand.

Tools and Materials

• Well point (steel or PVC) with a screen suited to your sand
• Drive pipe in 5 foot sections, couplings and thread sealant
• Drive cap and a manual post driver or slide hammer, or a jetting setup for PVC
• Pipe wrenches and a hand auger to start the hole
• Check valve or foot valve and a shallow well jet pump or pitcher pump
• Sanitary cap or well seal and a surface concrete pad if required locally
• Safety glasses, hearing protection, gloves and steel-toe boots

A well point drive kit that bundles the point, drive cap and couplings can simplify shopping, but confirm the pipe size matches the pump inlet you plan to use.

The Driving Process in General Terms

Where homeowner installation is legal, the general sequence looks like this. Many owners still hire a licensed well contractor, who has power drivers and knows local geology.

1. Confirm permits and utility locates. Wait for 811 marks, and keep the site within required setbacks.
2. Auger a starter hole. Bore down as far as you can by hand, often 6 to 10 feet, to confirm sand and get the point started straight.
3. Assemble the point and first pipe. Use sealant on every thread and tighten firmly. Loose joints are the most common cause of air leaks later.
4. Drive in short strokes. Use the drive cap and a post driver, keeping the pipe plumb. Tighten joints every few feet, since pounding loosens them.
5. Listen and test. Drop a weighted string down the pipe periodically. Once the point is several feet below the water table, the string comes up wet well above the tip.
6. Develop the well. Pump hard to pull fine sand out of the formation around the screen until the water runs clear.
7. Seal and connect. Install the check valve, connect the pump, and cap or seal the wellhead per local rules so surface water cannot run down along the pipe.

If the pipe suddenly stops moving, you have likely hit a rock or clay. Do not keep pounding; you can bend the pipe or crush the screen. Pull it and try a new location a few feet away.

Yield Limits and Pump Pairing

A typical 1-1/4 inch driven well yields roughly 3 to 10 gallons per minute in good sand, enough for a garden hose or a few sprinkler zones. Some owners connect two or three points to a common manifold to increase flow. Yield drops in late summer when water tables fall, so a point driven in spring may need to go deeper.

Pair the well with a shallow well jet pump sized for the yield, generally in the 1/2 to 1 HP range, or a hand pitcher pump for occasional use. Oversizing the pump pulls air and sand. The pump must be wired to a properly rated circuit; electrical connections for a new pump should be made by a licensed electrician. If you work on an existing pump, turn off the breaker and confirm power is off with a non-contact voltage tester first, and never test or work on live circuits.

Troubleshooting

• Pump loses prime: usually an air leak at a joint or a failing check valve. Re-seal threads and replace the valve.
• Sand in the water: screen slot too large or the well was not fully developed. Continue developing or add a sand separator.
• Flow slowly decreases: the screen is encrusted with iron or minerals. Contractors can clean or replace the point.
• Well goes dry in summer: the water table dropped below the suction limit. Drive deeper or switch to a different well type.
• Cloudy or smelly water: stop using it for anything but irrigation and get a lab test.

General Cost Ranges

DIY parts for a single irrigation point, pipe and a basic shallow pump usually run from a few hundred dollars to around a thousand, depending on depth and pump choice. Contractor-installed driven wells generally cost more, often a low four-figure total including the pump. Permits and lab tests add modest fees. A drilled well is far more expensive but reaches deeper, more protected water.

When to Call a Licensed Professional

Hire a licensed well contractor whenever your jurisdiction requires one, when the water will be used for drinking, or when soils are mixed and unpredictable. Use a licensed electrician for any new pump circuit, and a licensed plumber or well pro to tie a well into household plumbing, which typically requires a backflow device to protect any public water connection. Permits protect you and your neighbors’ groundwater, so skipping them is not worth the savings.