Low water pressure is a phrase often used to describe what is technically a low flow situation, where one or more fixtures in a home do not provide adequate water flow. There is a relation between pressure and flow, but it is possible to have adequate water pressure but still have low flow out of one or more fixtures. For this section, we will use “Low Water Pressure” for both low water flow and low pressure, as they both have the same effect: not enough water being supplied to the fixture.
Single Fixture Low Water Pressure
If the low pressure conditions exist only at one or just a few fixtures, we have specific recommendations that may help. For all faucets, view our Low Water Pressure in Faucets article. For showers, please see our Low Water Pressure in Shower Heads article.
Whole House Low Water Pressure
If every fixture in the house has low water pressure, the cause may be corroded piping, a restriction of the line due to a failed pressure relief valve (PRV) or backflow preventer, low municipal water flow or a valve partially closed.
Testing Water Pressure
While these can be hard to find, Pex Supply does sell hose bib water pressure gages:
These are simple to use. Make sure no water is running elsewhere in the home. Thread the pressure gage onto any hose bib, and turn on the bib. Write down the resulting pressure reading. It is your “static water pressure”.
Municipalities may supply water pressure from 20 to 100 PSI, but typical readings are 50 to 75 PSI. If your water pressure is above 40 PSI, your “low water pressure” problem is not a water pressure problem, but a problem with the flow of water through your plumbing system. If the pressure is below 20 PSI, contact your local water supplier. If you have a pressure reducing valve, or PRV, you can adjust the PRV by turning the hex head nut at the top of the bell counter-clockwise, and observing if the pressure is increased. See the PRV section below for disassembling and repairing a PRV.
Partially Closed Valves
Starting with the easiest solution first, verify that the shut off valve on the main water supply is fully open. Shut off valves are usually located where the plumbing enters the home. There are two basic types, the ball valve configuration and the gate valve configuration.
The ball valve usually has a handle similar to the image, where the long portion of the handle indicates the position of the ball diverter inside. When the handle is “in-line” with the piping, as shown in the photo, water can flow freely. Turning the handle 90 degrees shuts off the water entirely. Any position in-between restricts flow.
A gate valve, and its cousins that look similar such as globe valves, use a rotary handle to determine the position of the “gate” inside. Turning the valve handle to the right (clockwise) closes the gate, preventing water flow. Turning the valve handle to the left (counter-clockwise) opens the gate completely. Older valves may be stiff and seem frozen. Under the handle is the packing nut; using a wrench on it and turning it 1/8 turn, just barely loosening it, is often all that’s needed to “un-freeze” the handle.
Where else will valves be? If all the hot water seems to have a low flow situation, check the cold water inlet to the water heater; it should also have one of these valves. In some older homes, you may have multiple valves as plumbing has been reconfigured.
The PRV or Backflow Preventer
Some homes have a pressure reducing valve (PRV) or backflow preventer installed. A typical PRV is pictured at the right. The PRV has an internal assembly of springs and discs that regulate the pressure coming into the home. When these parts start to fail, the result can be reduced flow to the entire house.
Shut off the water before disassembling the valve. If the main water shut off to the home is before the PRV, you can use it to shut off the water. However, if the PRV is located before the main shut off, the water must be shut off at the meter or municipal supply, usually located at the edge of your property. If the parts inside the PRV are corroded or fused with mineral deposits, take all the parts to the plumbing department to obtain exact replacements. In some cases, you may have to replace the entire PRV.
Corroded Piping
Most often seen with steel or galvanized water piping after 18 to 20 years, the internal passageways of the pipe may be partially closed due to years of corrosion and mineral buildup.
Unfortunately, there is not much that can be done to correct this problem, other than replacing the pipes. This is an expensive, labor and material intensive job. There are measures you can take to mitigate the effects of it while you save to have the house re-piped.
In most cases, homes with internally corroded pipes have “full flow” fixtures as well. Installing flow restrictors in the faucets and showerheads may help, especially when multiple fixtures are being used. For faucets, modern low flow faucets with aerators will seem to provide more flow than before. This won’t help your toilet tank to fill quickly, or your washing machine to fill any faster, but it can help reduce the appearance of low flow problems for showering, washing your hands, etc.
Last winter my water pipes in my well house busted, I repair all the piping and installed a new pressure take but know my water pressure is horrible. But I have good pressure at the faucet at the well house and my well don’t kick on and off a lot which should mean I don’t have a water leak. If any suggestions on how to fix my water pressure please let me know.
Mike,
Check your “Pressure Switch” and see if is a 30-50PSI or a 40-60PSI. If it is a 30-50 you can change it to a 40-60 and that will help. Something else to check is your pressure tank. (The big Blue tank) If it has a ruptured bladder in it, then the only pressure you’ll have is when the pump is actually running(Which won’t be much.) the pump will run every time you run water in the house and that can over work the pump and cause premature failure which will lead to $$$. You can check for a ruptured bladder by depressing the Schrader valve (tire valve stem)on the top and see if water comes out of it. Your best bet is to call a qualified well guy out to inspect your system. My recommendation is that if you do end up having to replace your pressure tank, replace it with a nice big one. This will cause your pump to kick on less often and a pump is much more expensive than a pressure tank. One last thought, if you have an in-line water filter? When was the last time you replaced the filter in it? A dirty filter can cause low water pressure and make your pump work harder. A new filter will only run you about 20-25 bucks.
If you don’t have an in-line filter, you might consider installing one before the pressure tank. It will keep sand out of your pressure tank which again, if the tank is clogged with sand it can cause low water pressure.
Can you adjust the pressure regulator to increase water pressure.
Have Loud Vibrating noise at my Water pressure regulator when using outside sprinkler, showers and some faucets, never had this problem since we purchased house in 2001.Replaced water heater about 6 months ago.
What can be the cause?? Please advise
Robert,
It sounds like what you’re describing is “Water Hammer.”
Water hammer can be a big thump that shakes the house, or a series of banging noises starting with a loud bang followed by several “Chatters.” It could be that your water pressure regulator (PRV) may be failing. If this is the case, you’ll need to replace the PRV. If the PRV is fine, then you could control it by installing a water hammer arrester.
Water hammer arresters use a pressurized cushion of air and a two pistons, which permanently separates this air cushion from the water system. When the valve closes and the water flow is suddenly stopped, the pressure spike pushes the piston up the arrester chamber against the pressurized cushion of air. The air cushion in the arrester reacts instantly, absorbing the pressure spike that causes water hammer. Unless you are handy with “Sweating copper” you may call someone qualified to install these for you.
Don,
Most residential PRVs have an operating range between 25-75 psi, and are preset at the factory at about 45 psi. Get yourself a Hose bib water pressure gauge (any good plumbing supply)and check to see if you are within these limits.You really should not mess with the pressure unless you are qualified.
Typical symptoms that a PRV that is no longer working properly are: A sudden loss or a gradual reduction in water pressure within the entire home for no
apparent reason. A banging or high pitched whistling sound coming from the pipes usually when the water is being turned off. PRVs can fail in the open position
which will give you pressures that are too high. Usually there is no indication this may have occurred other than noticeably higher pressure at the faucet or toilets that
continue to run after the bowl is filled.
Yes you can,but mind the age of your distribution pipes in the house,also check the type of plumbing materials used,is it copper pipe,pvc or ppr?Increase in pressure may case serious leakages in your apartment if care is not taken.Seek the advice of an experience Plumber before you incease your pressure.Less water pressure could be cased by bust inner rubber bladder which is inside the pressure tank,You can check this up by removing the pressure tank from the pump and replacing the inner bladder with new one.Check your water pump diffuser and impeller.
We recently installed a new pressure tank along with new regulator since doing this we go from high pressure toa dead stop when shower or any faucet ttakes 45-60sec. then comes back on full pressure any ideas
Our pressure is fine coming into house & to outside tap, but the pressure is very low to bathroom, kitchen & en-suite.
The water won’t flow from my kitchen faucet. I get water flow everywhere else in the house. Should I replace the kitchen faucet? or what?
I suggest that you replace the kitcken Faucet,or loose the Faucet head,get to the rubber washer and see if it has sticked in the in water inlet hole.
At the water pressure tank in my basement the gauge reads 48PSI, but the cold water pressure throughout the house is weak, any ideas?
Had a pinhole leak in the water main this morning. Plumber came out and fixed it by soldering a coupling over the hole. However, our water pressure seems just a little lower than it did before. Any ideas on what the problem might be would be welcome. It’s not un-livable, but it’s annoying as hell.
Hi Larry,
Is the low water pressure issue new? Did it it occur prior to the pinhole leak in the main?
It is possible that there are other pinhole leaks in your water main. I would purchase a hose-bib water pressure gauge from the local hardware store and ensure you’re getting more than 45 psi.
Feel free to ask questions or keep me updated. Thanks.
My Girl friend just got a house and the bathroom that was added on to the original house has low water pressure issue for the shower, any thoughts.
Hi Everyone,
We are on a well water system in our two-story house. Several of the facets towards the back of the house do not work, no cold water comes out of them! What could be the problem? We have a lot of silt and minerals in our water.
Thanks for any suggestions!
Hi there,
Within in the past 3-4 days the water pressure in the bathroom has gone down to half of what it was before. Do you have any idea how I can fix this? The toilet is very slow to flush & fill back up, and the shower is very light pressure now.
Thank you =)
Check if someone has closed your main control valve without you knowing.You failed to tell us your source of water supply,this would have explained to us where to trace your problem from.Are you getting your water privately from a well or directly from Government water line?On the toilet,particles has blocked the tiny hole inside the ball valve inside the WC tank,if you can’t do it yourself invite a plumber to open the valve and do the cleaning.Your problems generally might come from your main water supply source.
I switched from well water to city utility 3 years ago. I had a PRV installed and set for 55 psi. Our water pressure seems to have dropped and I check with a water pressure gauge. Static pressure varies from 20 psi at one outlet to between 35 and 40 at another. Also, the red arrow is usually 10 to 20 psi higher whenever I check. Any ideas? Thanks
Hi, I live in a mountain village with water supplied from a well from the hill above,whether it is just gravity fed I dont know. I have a bottled gas water heater on my balcony. I have checked the pressure going into it and coming out and it is 29 psi. The kitchen sink is directly under it and the shower is in the room next door. These are the only two take off points.But the pressure is poor in both cases, more like half the cold tap next to it. From the bacony heater, the hot water goes 90 centimetres up then right angle a metre then 190 centimetres to the balcony floor. After it passe through the kitchen ceiling it drops another 190 cts. to the tap below.
My question is. Do I lose more pressure by going up 90 cts and coming down the same distance or is one exactly balanced by the other. In other words would I benefit by cutting out that arched section and going straight down or am I wasting my time.
I have checked all my valves and the heater has clean pipes.
I hope I have made my problem clear, thanks for any help.
For the past couple of months my hot water pressure is getting weaker all the time.I have noticed a humming when turning on the hot in the shower.the faucet is new in the shower,two years in the bathroom sink,and four years for the kitchen.the low hot water pressure is in all three.what should I check
We have a well, less than year old, new house so, all new plumbing. The past couple of days the water pressure has fluctuated. I turned the water on in the bathroom and watched the gauge. The pump came on and it went up from about 40 psi to 60 psi. The pump turned off at 60 and dropped to 40 psi and the pump turned on again. This continued until I turned the water off. Just as I turned the water off, our heating system came on. It’s geothermal so it uses water, so the pump started doing the same thing. Any ideas what is causing this fluctuation?
Naomi,
Your pump is set to turn on at 40 and turn off at 60. It is functioning properly. If you want a consistent pressure you would need to install a variable speed pump that reacts to the different flow requirements as each fixture is used.
We had a hot water leak in the foundation near the kitchen. Leak detection co. found it, we opened the outside wall and jackhammered the foundation and found it. Before the plumber could fix, it stopped the next day. Just before while it was leaking the water flow in the kitchen dropped. Today, the flow has dropped in other areas as well. What could be the problem and why would the leak just stop? It was spraying out a good amount of water.
I am in the process of buying a house that has well water. The inspector could not perform the well flow test because there was extremely low water pressure throughout the whole house. In the room with the tank and water conditioning thing there was a clear cylinder with a filter and it was brown and gritty. Could this dirty filter cause the low water pressure throughout the house?
Hi, let me just ask the one point of physics, concerning low water pressure. If you have say 25 psi from a pipe that goes up a metre then horizontal then down a metre before going to the floor below,
is your pressure at that point the same or has it got less? Thanks!
thank you so much this article helped in so many ways, we have had a problem with the water pressure for a week now so we called the water company, only for them to tell us that it was a problem on our side and to call a plumber.well we cant afford that so i looked it up and found your article and did everything it said to do and sure enough one of the main valves somehow was shut off. i am so relieved now thank you
HOW DO YOU KNOW IF YOUR HOT WATER TANK IS THE PROBLEM,WITH YOUR LOW WATER PRESSURE,OR IS IT JUST THAT MY PIPES ARE GETTING CLOGGED GOING TO BOTH YHE KITCHEN AND BATHROOM.
We have a spring with a pump, and pressure tank. Recently our water pressure for the whole house is very low (takes 2-3 hours for the washer to fill up to wash a load of laundry). We replaced the pressure switch which seemed to help a little for a couple of days but now the problem is back and worse than before if you use one faucet in the house you can not get water out of any of the other faucets. The pressure starts off good and then after a few seconds drops down to a small stream. Any ideas?
Just bought a house (in our same neighborhood, by the same builder as the prior house). The water flow to the kitchen and master bath is very low, regardless of temperature. Both areas are in the back of the house. I removed the shower head and confirmed it is a low flow. The house is about 3400 square feet. Located in Las Vegas (no basement). Any ideas why only part of the house would have an issue? Could there be a valve somewhere that is not open? Original plumber that did the work is out of business. We never had any issues at the old house. Any thoughts would be greatly appreciated!
Hello,
I line in a 3 story town house. Our water is pumped from the basement through the house. I have low flow issues with my toilet and kitchen faucet on the second floor. The faucet in the second floor restroom seems to put out a lot of pressure, but it may just be well airated. I would assume I have low water pressure, however, my shower and sink on the 3rd floor do not have any issues. What could the problems be?
Im not sure where the real problem is. here is the scenario… we have a 82 gals wellmate butyl bladder tank. we have attached a 1.5hp goulds water pump. the pump is pumping water from an overhead tank… the problem is the pump is able to supply the pressure of up to 70 psi but when the pump is running, the pressure coming out from the faucets is very low. but when the pump is not running, the pressure is very high and it is what i am looking for… i also tried a new waterpump but the same problem occurs. does anyone here encountered the same problem as mine?
Our Problem Is In The Bathroom. Great Cold Water Flow Poor Hot Water Flow In Shower & Sink. When The water Is Turned To Hot Only In The Shower Pipes Start To Sing !! Pressure Is Great Downstairs & In The Kitchen !!
I have been experiencing low water pressure for the last 4 days now. I have a house built in 2002 with PVC. I have a large water tank with a PRV between the pump and tank. After the tank I have an in line filter in which I change out about 2 weeks ago, then a water softener then to the house.
I have 50 PSI on the gauge, and great pressure at the tank. But I have extremely low at the house. Any suggestions would be greatly appreciated.
Hi- I live in Crestwood, Il and we have owned 2 homes here now. I am trying to determine if the low pressure problem is a municipality issue or within our home. We noticed in our previous home that at certain times, the water pressure would be really low. At the times when the pressure was full, it was really a full stream and very nice. When we bought our current house, the one thing that I looked for was the water pressure. Everything seemed updated here in terms of faucets and plumbing and when we turned the water on, it came out full force. After we moved in, the water man came to read the meter and we noticed that the water pressure went a lot lower than what it was. Kind of like at the old house. This went on everytime the water meter reader would come. I asked a girl at the village hall one day if anyone else had the same problem. She told me yes. Well, here we are 4 years later and the water pressure is low all the time now. The only time we have a decent water flow is early in the morning 5-7am. On Christmas Eve we woke up to no water in the house. I called the police dept as the public works dept was closed. The officer had informed me that 3 other people on my block had called with the same problem. I also noticed that my hot water tank has been making a sound like a tea pot ever since Christmas Eve as well. I had one plumber tell me that he believes that it could be because there is not enough water pressure getting to the house from the street. When I called the village public works dept, I was told that there is no problem with the water flow from the village and that my water is at full and good stream. I know for a fact that it isn’t because I know what full stream is. I checked all the valves and they are open. I don’t know what to do now. Do you have any suggestions? Is there anything else that I can check in my house before taking the next step?
Hi- I recently inherited an older house and all the plumbing was redone due to vandelism. Now i have VERY poor water pressure throughout the entire house….Prior to this the house had GREAT water pressure before the plumbing was replaced. I called the plumber(not very reliable & cheap-bad idea) my parents had to do the work..He stated the problem may in the lines leading to the house and he may have to dig up and replace. Is there something else he needs to check before that is done? Maybe the initial pipe were the shut off vavle is, is too big and he should have put a smaller pipe..I’m just wondering…Please help I’m not trying to spend unecessary money I really don’t have..
Thanks Barry
We have a house thats 30 years old and has a well in our basement. Just recently we have little pressure in our bathroom sink and our washing machine. I found out that if I put the washer on hot water there is pressure but as soon as I put it on cold water it takes forever to fill up the washer. I checked the pressure on my pressure tank and it was about 38lbs. Any ideas what the problem would be? I tried the cold water on my kitchen sink and it has good pressure. ??
I recently had the water department out to tell me my pressure
is fine. My problem is, the flow of water is fine for a few seconds,
and then drops off. It’s most noticeable in the morning, sometimes to the point of a slow drip coming out of my shower head. I’ve been showering and doing dishes, laundry, etc. in the evening, but the flow is still less than it was. I’m going to get the pressure gauge later today, and I’m also going to look for the PRV, and verify all valves are full open. Other than what I mentioned, any suggestions? Thanks
My hot water heated was replaced several months ago. Since that time I’ve noticed a decline in my water pressure & it’s getting worse. If someone flushes the toilet while I’m in the kitchen the water turns to a trickle. The water pressure in my master bath is very low all the time now. Epecially when filling my tub. Any suggestions? Thanks!
over the past two days the total water pressure throughout the house has decreased, and then it just stopped altogether. No water. I called the water company and they came out and said the meter at the street was still spining (but don’t know how much), so they turned the water off. They said we have a leak between the house and the street. This seems suspicious as there is no water seen anywhere in, out or around of the house, the house is not very old (18 yrs), has copper pipes, weather has been unseasonably warm this winter. I’ve been in the house 9 years, and never an issue. I’m setting up an appt with a leak detection company, but suspect some valve or other equipment may be the cause (i hope). Thoughts?
Good explanation, Mark, I couldn’t have said better.
Dmitry
Have no water pressure from hot water side but fine on cold and every other faucet in house. What could be causing this?
Hey we have very good strong water pressure when you first turn on any faucet or shower in the house, but after it runs for 15 to 20 seconds it dies down. Also if you flush any of the toilets you have almost no water coming out at any other faucets, even the washer. What could be the problem? This problem has only been going on for maybe a month tops. We have lived here for almost a year and never had an issue.
The sink in my master bath has extremly low water flow (both hot and cold water) and the cold water in my washing machine is just a trickle (not hot water) … All of the other sinks, showers, etc. work just fine. Do you have an idea what the reason might be?
why does hot water only in shower kitchen and bathroom sink have low pressure.cold water fine
We had new plumbing put in upstairs in our bathroom. We have gobs of pressure before. We replaced galvanized with the new colored plastic pipes and separated out the tub and the shower (they used be one and the same). Since then we have very low water pressure. Any ideas what may be happening? We have a bladder system (basement) and the bathroom is on the second floor.
thanks! Kelly & Michael
Hey everybody,
I live in a five story apartment building in a gentrified neighborhood in Washington, DC. Many times my shower stops completely and at the worst moments. Sometimes there is not enough water to flush the toilet. I noticed that the manager has had plumbers replacing things and treating pipes with chemicals yet the problem continues.
Anybody else with the same problem? Or has anybody had this problem and had it resolved? Please share your story.
Rich
I tuRned on my sprinklers and had no pressure to the sprinklers. I also noticed that I lost all water pressure to the house. I hear a noise at what appears to be a backflow. Ot sits in its own water meter like box behind the actual water meter (box)…Any recommendations?