A listing that says "existing well on property" sounds like a head start. Sometimes it is. Sometimes it is a well that has not run in five years, a casing that is cracked or full of scale, a pump that seized when the last tenant left, and water that has not been tested since the state required it at installation. Before you move in and start drinking that water, the well deserves a real look.
Most well companies will tell you to replace whatever they find. At J4 Water Works we test what is there and tell you honestly what we find. The point is not to talk you into a replacement. The point is to tell you whether the well works and what it will take to keep it working.
Start with the well record
Texas keeps completion reports on file at the state level. Every licensed driller submits a well completion report when a well is finished. That report shows the depth, the casing type, the grouting seal, the driller's name, and the aquifer accessed. It is a snapshot of the well on the day it was built, and reading a driller's log is a short skill worth having.
You can look up a well record by parcel address or location coordinates through the state groundwater database. Not every well in Texas has a record on file, especially older ones drilled before electronic filing was standard. But when a record exists, it tells you a lot about what you are starting with.
Ask the seller or their agent if any well records or pump service records are on file. Some properties have documentation. Most do not. Either way, you go into the inspection knowing what has been recorded and what has to be tested fresh.
How old is the casing?
Casing is the pipe that lines the well bore and keeps it from collapsing while keeping surface water out of the water column. Casing condition is one of the most important things we check on an existing well.
Steel casing corrodes over time, especially in soil with high mineral content or where surface water is slightly acidic. Casing installed twenty or thirty years ago may have pinhole corrosion at seams or joints below grade. Those pinholes let surface water in. Surface water carries bacteria, nitrates, and anything else that has been in the soil above your water table.
PVC casing lasts longer and does not rust, but it can crack or shift in aggressive soil movement. We covered the differences in our piece on PVC versus steel well casing.
Neither material lasts indefinitely without attention, and a casing that looks fine from the surface can have issues below grade. That is what a physical inspection finds that a well record does not. Where the record and the surface both come up short, a downhole camera inspection shows you the inside of the casing directly.
Does it actually produce?
A well that sat idle for years may have a pump that seized from sitting, electrical connections that corroded in the humidity, a pressure tank that waterlogged, or a water level that shifted. We have seen plenty of wells that look fine from the surface and produce nothing when the switch is thrown.
We test pump output, check pressure, and measure water level. We run the system and watch what happens. Output testing gives you a recovery rate, which is how fast the well refills after being drawn down. That tells you whether it can keep up with a household's daily demand.
A well that cannot produce enough for a family is not necessarily failing. It may have been drilled for irrigation or livestock with lower output requirements. That is important information before you decide to rely on it for a house.
What does the water actually say?
Testing requirements for a new well apply at the time of completion. That test is years old on a used well, sometimes decades. Water quality changes. Bacteria levels fluctuate. Iron and hardness can shift as aquifer conditions change over time. Surface contamination from agricultural activity or soil disturbance can reach a well if the casing seal has degraded.
An existing well on property you are buying needs a fresh water test before you drink it. Test for bacteria and pathogens first, because that is the safety question. Then test for chemistry: hardness, iron, sulfur, nitrates. The safety test tells you whether the water is safe. The chemistry test tells you whether you will need treatment to make it comfortable to live with.
We walk through what results actually mean in our piece on arsenic, nitrates, and coliform in Texas well water.
What a pre-purchase well inspection involves
When we inspect an existing well for a prospective buyer, we pull available records if they exist, walk the wellhead and check the casing and seal visually, run the pump and test output, measure water level, and pull a water sample. We write up what we found in plain terms: what is in good condition, what needs attention, and what it all means for using this well as your household water source.
Getting this done before you close gives you options. A seller may fix the problem before closing. You may negotiate a price adjustment. You may decide the property's water situation is more than you want to take on. Those choices are gone once the deed changes hands.
We put together a full pre-closing checklist covering the well alongside septic and water treatment questions in our guide on water and septic to check before closing on rural Texas land.
After you close
If you closed on a property with an existing well without an inspection, here is where to start.
Test the water before you drink it. Do not assume the well is clean because the house sat empty. Get a fresh test and know what is coming out of your tap before you count on it for the family.
Have someone check the pressure tank and pump. Pressure tanks waterlog over time and lose the ability to regulate pressure. A waterlogged tank makes the pump cycle constantly, which shortens pump life. A quick check and recharge or replacement saves a pump.
Check the wellhead and seal. The wellhead should sit above grade, the casing cap should be sealed, and there should not be standing water pooling around the casing. These are the visual signs that the surface seal is intact.
We treat your land like it is our own. That includes not letting you drink water from a well that has not been verified. If it is fine, we tell you so and you drink it with confidence. If it needs work, we tell you what and why before we quote anything.