Water Pressure Troubleshooting for Hill Country Wells
Published
Pressure problems are the most common service call in well systems, and also the most misdiagnosed. Most homeowners assume "weak pressure means the pump is dying." Sometimes that is right. Most of the time it is one of three other things — and they are all cheaper to fix.
Here is a structured way to think about pressure problems before you spend money on the wrong fix.
Symptom 1 — Pressure used to be strong, now it is weak everywhere
If pressure is low at every fixture in the house and used to be normal, the order of likely causes is: pressure switch out of adjustment, waterlogged pressure tank, then pump losing performance. That is the ranking by frequency, and it is also the ranking by repair cost.
Read your pressure gauge. If it cycles between 30 and 50 PSI when it should be 40 and 60, the switch is set wrong or failing. Adjustment is a 5-minute fix.
Symptom 2 — Pressure drops fast then slowly recovers
Open a faucet. If pressure drops to almost nothing in the first 10 seconds and slowly climbs back as the pump runs, you have a waterlogged pressure tank. The bladder failed and the tank is no longer storing pressurized water — the pump has to do all the work in real time.
A waterlogged tank also short-cycles the pump, which is the number-one reason healthy pumps die early. Replace the tank, save the pump.
Symptom 3 — Pressure is low at one fixture only
If the rest of the house is fine but one shower or faucet is weak, the well system is not the problem. The likely causes are an aerator clogged with sediment, a partially closed shutoff valve under the fixture, or scale buildup in the supply line to that fixture.
Hill Country water is hard, and scale builds up over years. Often a fixture replacement or supply-line flush is the entire fix.
Symptom 4 — Pressure is fine in winter, weak in summer
Seasonal pressure drops usually point to one of two things: irrigation demand exceeding pump output, or a dropping water table during dry months that lowers the pump submergence and reduces effective output.
The fix depends on which it is. If the formation produces enough but the pump cannot keep up with combined demand, a constant-pressure VFD controller often solves it. If the water table is dropping, the pump may need to be set deeper or the well may need to be deepened.
Symptom 5 — Pressure is good but flow is weak
Pressure (PSI) and flow (GPM) are not the same. A house can show 50 PSI on the gauge but still feel weak when two faucets are open. That is usually a pump or formation that cannot sustain GPM, not a pressure problem at all.
A drawdown test — open the system, time how long it takes to drop pressure under sustained load — tells you whether the pump can keep up with real-world demand.
When to call
Anything that involves pulling the pump or splicing downhole wire is a service call. Anything above ground — switch, gauge, tank — can usually be diagnosed remotely with a few clear photos and gauge readings.
Submit a request with your symptoms, gauge reading, and any recent events. We will tell you what to expect before the truck rolls.
Related questions, answered.
Most Hill Country residential systems run on a 40/60 PSI switch — pump kicks on at 40, off at 60. Larger homes sometimes run 50/70. Constant-pressure VFD systems hold steady at a target like 60 PSI.
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