One Line Jet Pump (C) Daniel FriedmanDiagnose & Repair Poor Water Pressure / Lost Well Water Pressure

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Private well water problem diagnosis:

How to diagnose poor well water pressure or total loss of water pressure: this article explains how and why to distinguish among intermittent water pressure loss, total water pressure loss, and poor water pressure or flow in a building.

We give diagnostic and repair procedures for both municipal water supply problems and well water supply problems.

The process of diagnosis and the costs of the repair are explained. Consumer advice on saving money on water supply repair costs includes a review of the parts and labor costs of a typical well pump and pressure tank replacement case.

We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.

How to Diagnose & Correct Poor Well Water or Pump Water Pressure or Flow

Clogged galvanized steel piping (C) Carson Dunlop AssociatesThe following articles pertain if you have a private well, pump, and tank system for your building or if your incoming community water supply pressure and flow are just too low to start with:

  1. Water Tank Problems? See WATER PRESSURE TANK REPAIRS. Examples of water tank problems include poor water pressure or the well pump rapidly turning on and off (short cycling).
  2. Water pump problems? Examples of water pump problems include poor water pressure or no water pressure at all. See
  3. Poor water pressure or no water pressure after an electrical power loss, lightning strike, or storm? Water pressure may be lost entirely following a power loss or electrical storm or lightning strike.

    Check first for a blown fuse or tripped circuit breaker. A lightning strike can also damage electrical wiring supplying a submersible pump, or it may damage the pump itself. And less common, a total power failure can sometimes expose a latent problem in the system such as a failing pressure tank bladder or well foot valve.

    But always look for the most direct explanation first rather than the more complicated one. So if water pressure fails after electrical power has been lost but then returned, start by looking for an electrical problem.

    Watch out: a power surge or lightning strike can on rare occasions trip just half of an un-linked 240-Volt circuit breaker or blow just one of the pair of fuses powering a 240-volt electrical circuit, leaving a pump that runs, but barely, developing only minimal water pressure, or a pump that runs not at all.

    An electrician or an experienced well and pump installer can diagnose these conditions by testing the well pump circuit itself, but before calling an expert, just check the fuses and circuit breakers. Thanks to reader EK Woodard for these details.
  4. Water piping or well piping problems between building and well? If your water pump keeps losing prime, a shallow well jet pump well line could have a bad foot valve (in the well
    WELL PIPING FOOT VALVES) or there may be a bad check valve on well piping at or near the water tank
    or near the above-ground water pump
    (CHECK VALVES, WATER SUPPLY) and so be losing prime. A leak in the well line piping itself can also lead to loss of prime or to air entry into the piping system
  5. Well Problems? Do you run out of water or after running water for some interval water pressure and flow are poor? Well problem diagnosis starts
    at WELLS CISTERNS & SPRINGS. Leaks in well piping either inside the well itself or between the building and the well bottom can also mean reduced water flow, quantity, and pressure in the building.

    Before assuming that there is no water in the well, check to see if the water pump is working properly, including loss of pump prime (WATER PUMP PRIMING PROCEDURE) and

    a bad or leaky well piping foot valve

    AIR DISCHARGE at FAUCETS, FIXTURES can also indicate a failing well.

    Also see Define Safe Yield for a Well.

    Readers whose wells simply run out of water should


  6. Water pump pressure switch (C) Daniel FriedmanBad water pump or water tank pressure regulator control? 
    See WATER PRESSURE REDUCER / REGULATOR (not usually installed on private well and pump systems, often present on municipal water supply systems that use an in-building local water pump and pressure tank to boost pressure).

    Before adjusting a well pump pressure control switch
    (WATER PUMP PRESSURE CONTROL SWITCH), changing building piping, or considering installing a water pressure booster pump

    (WATER PRESSURE BOOSTER PUMP), it is essential to understand what the incoming water pressure is and exactly why the building water pressure is not satisfactory. Start at the beginning of this article:

    Water pump pressure regulator switch diagnosis and repair steps include these:
    • How to Adjust Water Pump Pressure: The detailed, step by step procedure for inspecting and adjusting the water pressure control switch is discussed in detail
    • Diagnosing Water Pump Short Cycling on and off: If your water pump is clicking on and off too often or quite rapidly
      see SHORT CYCLING.
    • Diagnosing Water Pressure Drops without explanation when the pump stops,
      see WATER PRESSURE FALLS SLOWLY, ERRATIC PUMP: bad pressure control switch, building water running or leak, bad pressure gauge, bad check valve, bad foot valve.
    • Diagnosing & Repairing Lost Air in the Water Tank: The problem of lost air in the water pressure tank along with how to correct that condition are discussed beginning
    • Diagnosing & Repairing a Water Pressure Control or Water Pump Control Switch: We discuss diagnosing and repairing a water pressure control switch that sticks "on" or "off" or simply won't operate,
      at water pump Pressure Switch Repairs.
  7. Bad cold or hot water pressure and flow just at certain plumbing fixtures? See our discussion
    of Poor water pressure just at certain plumbing fixtures just above.
  8. Clogged galvanized steel piping (C) Carson Dunlop AssociatesPoor water pressure due to clogged building supply piping? Even municipal water supplied in some communities can be "hard" or high in mineral content, iron content, or other ingredients that lead to clogged water piping.

    Our sketch (left) courtesy of Carson Dunlop, shows how rust can clog steel water supply piping.

    If incoming water pressure is high - say over 40 psi, but water pressure falls off almost immediately when you open a faucet and remains poor, there may be a clog somewhere in your piping system, or worse, in most of it. This condition usually develops over a long time - years - and does not change suddenly on its own.

    Readers should also see WATER PIPE CLOG DIAGNOSIS




    or WELL WATER PRESSURE DIAGNOSISwhere we describe the effects of clogged piping on water flow and offer remedies for this problem.

    If only hot water pressure and flow are poor, also

  9. Small diameter building water supply piping also limits water flow rate: Improving water flow by larger pipes (C) Carson Dunlop AssociatesEven if the municipal water supply pressure is good.

    A building using 1/2" diameter piping, especially if the incoming water pressure is modest, or if the building has extensive lengths of water supply piping, perhaps combined with many elbows and tees, will suffer reduced water flow at its fixtures.

    A common "fix" for poor building water "pressure" (really flow) where the piping is blamed, is to install larger diameter water supply piping wherever the piping is readily accessible, such as in a basement or crawl area.

    As the sketch at left, courtesy of Carson Dunlop Associates shows, installing larger diameter water supply piping helps regardless of where in the piping sequence it is installed - so you don't have to rip out all of the building water piping to make this water flow rate improvement.

    Since bad water pressure or flow can be a piping problem rather than a supply quantity problem, also
  10. Poor hot water pressure, acceptable cold water pressure at all fixtures? This condition often indicates clogging in the hot water piping or if a tankless coil is used to make hot water, clogging there.
    See CLOGGED SUPPLY PIPES, HOT WATER. Bad Hot Water Pressure?

    See HOT WATER IMPROVEMENT especially if the building cold water pressure is acceptable but hot water pressure and flow are poor. Accumulated debris in a water heater, and debris from a corroded or disintegrating hot water tank dip tube or hot water tank sacrificial anode can also block the hot water outlet opening, resulting in low hot water pressure in a building.
  11. Poor water pressure just at certain plumbing fixtures? Causes of bad water pressurePoor cold water pressure, hot water pressure, or both hot and cold water pressure or flow that is observed just at some plumbing fixtures in a building while flow and quantity are good at others suggests that the water flow or pressure problems are local to certain runs of supply piping or to the specific fixtures.

    The sketch at left, courtesy of Carson Dunlop, shows five factors that affect the water pressure and flow in a building. Check the following first:
    • Clogged aerator or strainer on sink faucets - clogging by dirt, debris, corrosion, can significantly reduce both hot and cold water flow at a sink where the strainer needs cleaning or replacement. Unscrew the strainer from the faucet and turn on the water - if the fixture pressure or flow is much better you've probably found the problem.

      Look at the aerator/strainer: inspect it, clean it, perhaps soaking it overnight in vinegar to remove corrosion and mineral build-up, or just install a new aerator/strainer.
    • Broken O-Rings on individual faucets - can clog the faucet internals and prevent good water flow. If just hot water or just cold water flow is weak at an individual fixture you or your plumber should check for and repair any damaged faucet parts.
    • Clogs in individual plumbing pipes, valves, elbows - can occur during construction if copper pipe soldering is not performed properly. Pushing too much solder into a copper pipe joint can result in weak flow and reduced pressure at all of the fixtures downstream from that fitting, even if the rest of the piping system is in good condition.

      You may need help from a plumber to diagnose this problem, but if your water supply piping is not clogging from mineral deposits throughout, and if flow and pressure are bad just at some fixtures, this could be the problem.

      Of course if an installer makes this soldering error on copper pipe joints near the beginning of a water supply piping system in a building, all of the fixtures downstream from that point will be affected, possibly all of the fixtures in the building. If mineral clogging might be a problem in the pipes in your building,
  12. Problems with water treatment equipment can cause loss of water pressure or no water flow: a clogged water filter, or a malfunction in water disinfection or other water treatment equipment can cause a reduction in water pressure or even a complete stop in water flow in a building.

    Also, a water treatment system that uses air injection to remove odors or gases can cause

    Here is an example of a drop in water pressure that may be due to water filter clogging:

    Question: We have a well in our home. Can you tell me what to do if we have a lot of black debris that is in our water filter system? We think this could be why we have poor water pressure. Is there such a thing as a build up of soot or debris that we need to do something to clean the lines?

    Answer: Try changing the water filter cartridge. If the problem is eliminated, the filter was clogged. If a lot of debris has been getting past the water filter, or if the water filter was a late addition to a home that has had a long history of using debris-laden water, pipes, fittings, faucet strainers, and shower heads may be clogged and may need to be cleaned or replaced.

    See WATER FILTERS, HOME USE for details about clogged filters, and

    see WATER TREATMENT EQUIPMENT CHOICES for our complete list of types of water treatment equipment.
  13. Need a booster pump? Remote well pumps & pressure tanks, multiple buildings, tall buildings with poor water pressure on upper floors can benefit by a second pump and pressure tank at the upper floors or remote location.

    Adding a booster pump can improve building water pressure where the private pump and well system can't get enough pressure or quantity or where the building height impacts water pressure on its upper floors.


Continue reading at WATER PRESSURE DIAGNOSIS FAQs or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.

Or see WELL WATER PRESSURE IMPROVEMENT - steps to improve water pressure & flow from a private well water supply


Suggested citation for this web page

WATER PRESSURE DIAGNOSIS, PRIVATE WELL at - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.


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