Poor water pressure diagnosis FAQs (C) Daniel Friedman Low Water Pressure Diagnostic FAQs
Problems with weak water pressure
     


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Low water pressure diagnostic FAQs: this article provides answers to frequently-asked questions about how to diagnose problems with slow, weak, or poor building water pressure & flow.

These bad water pressure questions & answers help sort out the causes of water pressure problems and help determine if the problem appears to be at the water pump, water pressure tank, water piping, or water source such as a private well or water storage tank.

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Low water pressure problems, questions & answers

Causes of bad water pressureQuestion: My water pressure is really low but we don't know where to start in figuring out what's wrong

My water pressure is low and I barely get any flow when I try to fill the tub. The hot water is still hot through out the house but when you flush the toilet the water almost stops if your using the sink or the shower. Any ideas on what the problem might be or where I can start. - Rachel

Reply: check these water pressure diagnosis articles first

Rachel, we have two articles that give step by step diagnosis of water pressure problems. Please see WATER PRESSURE LOSS DIAGNOSIS & REPAIR or for a water pressure troubleshooting guide in table form see our WATER PRESSURE PROBLEM DIAGNOSIS TABLE

And don't hesitate to ask if that material leaves you with more specific questions - I'll do my best to help further.

Question: huge water flow rate design question

My pump flow is 2500 cu meter per hour. The surge system consist of one large tank may be surge tank, one small tank, may be air vessel and 3 compressor (electric driven). Can you tell what are the system. Also can you tell me what are possible maintenance?? - Anand 11/22/11

Reply:

Anand, you are describing a commercial grade water supply system with a huge flow rate, but with virtually no information about what's installed - so I'm reluctant to speculate about the system and its particular maintenance needs. You should ask a local plumber who is familiar with commercial water systems to take a look at your system, explain its components and functions, and give you maintenance recommendations.

Question:

I have a well 285 feet deep and I just started to lose water pressure, It will come back after about 2 hours. but I had to add air to the pressure tank. This lasted for about 48 hours and the same problem I am going to add air again and see how long it will last. any Idea of what I'm looking at replacing or is my well going dry. - Craig 2012 3/4/12

Reply:

Craig, your description sounds as if your water usage rate exceeds the well recovery rate. The fact that water pressure returns suggests that the well is recovering during that two hour rest period. Especially if this problem is seasonal and shows up during the dry season, I suspect it's the well. You may want to add local water storage or ask your well driller about attempting to improve the well yield.

If you are not losing water pressure and flow totally, it may be that your well and pump include a protection device such as a tailpiece that slows the delivery of water to the home to keep it from exceeding the inflow rate of the well.

If it were a water pressure control switch or water tank problem, I don't think it would be seasonal and I don't think it would recover after two hours of rest.

Question: what could be causing my home to be losing water pressure over time

im having low pressure in my home i have everything underground because im in a double wide mobile home with just a crawl space i have been losing water pressure more and more over time im glad i read this article i went outside and turned on my water from a hydrant attached next to well casing and had strong pressure did not measure pressure no gauge then turned on water in house and lost pressure outside and also not strong pressure inside please need help to fix my set up was installed new in 1993 thank you - armco 9/13/11

Reply:

If water pressure (not flow rate) is deteriorating over time the problem could be with the pump itself (wear and tear), with a a well that is deteriorating in its flow rate (the ability of the well to deliver water), a leak developing and increasing in the well piping, or even a waterlogged pressure tank. I suggest

or for minimum reading and a more concise list of water pressure problems and probable solutions in the form of a table, see

Question: poor water pressure for our lawn sprinkler systems, no water pressure tank installed

I don't have a tank so the water comes out by the pump so the pump runs the entire time I use my sprinklers. The pump runs but doesn't seem to run as high as it usually sounds so my water doesn't keep coming out. Do I need a new pump? I replaced it 4 years ago. - Debbie 4/15/12

Reply:

Debbie, usually when we see a water pump system with no pressure tank installed, it's a special-purpose single-use system such as the lawn sprinkler system you are describing. In that case the presumption is that when the sprinklers are running the potential water flow rate through the system is greater than the gallons-per-minute capacity that the pump can deliver.

In that case, once we turn on the lawn sprinklers by opening a water control valve and then turn on the well pump, the pump will never "get ahead" of the water pressure or flow rate through the system, and it will just keep running indefinitely until you shut the whole system down.

If nothing has changed in your system, valves, controls, equipment, the problem could be any of several things including

  • a leak in the water piping between the pump and the sprinkler system
  • a leak in the sprinkler system piping
  • a control valve partly closed
  • a worn pump that simply can't deliver water pressure as high as when new - such as a damaged pump impeller
  • if the water source is a well (as opposed to a pond or stream) and the well flow rate has deteriorated the pump may simply have less water available and may even be cavitating as water levels in the well drop too low. See WELL FLOW RATE - water quantity problems.

Frankly this design makes me nervous because I worry that if the system and its controls were not set up by an expert we could turn on a pump without providing a pressure control switch for it - risking an overpressure in the water piping and bursting a pipe or possibly injuring someone.

Question: water pressure slows to a trickle

I have an in well pump, and what I'm getting is a big drop off of pressure in the house. It recovers after a while but does not last long ( bout a minute)then its just a trickle. I get good consistent pressure on the filter clean out valve but not in the house.

When water is running in the house, the pump cuts on & off while water is running but never the pressure it should.. Any ideas would be appreciated - Rob 9/4/12

Reply:

Rob it sounds as if your water filter may be clogged. Also check for a waterlogged pressure tank - lost air charge.

Question: no water at house, good water at barn - varies

(May 25, 2014) Anonymous said:

I have a deep well that services my horse barn and my home. The barn has great pressure but the house is at about 20#. It makes no sense. When there is water being drawn at the barn we have no water at all. I have checked all couplings for leaks and found nothing.
Sometimes the pressure at the house is up near 30 .if there was a leak it would not be variable I think. Any ideas?

Reply:

Anon,

Look for a leak in well piping, or an obstruction, or a limited-flow-rate well that is protected in the well by a tailpiece.

Question: parts & manual for a Canadian Tire 1/2 hp Jet Pump 62-3525-6

Ted Brydges said:

Where do I find the jet in a mastercraft jet pump? The Canadian Tire product number is 62-3525-6 for the pump.Pump does not build up enough pressure.

Reply:

Ted, on single line jet pumps such as the Canadian Tire 62-3525-6 the venturi or jet will be inside the housing on the front of the pump to which the well line attaches.

You will want to obtain a manual that includes a parts explosion diagram for your pump, and you may need to replace parts as well. I would not assume that the defect is the jet, though indeed we've had reports of occasional stones or debris entering a jet and reducing its flow capacity.

Other things to check when the pump is not building up enough pressure are a damaged impeller (inside the same housing) or a failing motor. If the motor is failing you may see an abnormally high current draw when the pump is running. Normal current draw on these 1/2 horsepower pump electric motors is around 10 1/2 to 11 Amps at 120VAC.

There are no motor lubrication ports on this pump, but if a bearing is failing the result may show up as high current draw, difficulty rotating the motor, or even leaks.

For parts for your Mastercraft pump (62-4003), call Canadian Tire customer service 1-800-942-3343

Canadian Tire describes this product as

Mastercraft Mastercraft 1/2 HP Jet Pump
Pump from a lake or well to a cottage, home, farm or campPump up to 25' deep ('shallow well')Ball bearing 115v motor features thermal overload protectionBuilt in ejectorHeavy cast iron constructionAutomatic 1/2 hp motor pumps 630-250 gph per 5 to 25 feetTank not included32.2lbs (14.6kg)

 

Continue reading at WATER PRESSURE PROBLEM DIAGNOSIS TABLE or select a topic from the More Reading links shown below.

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