03:07PM | 09/13/04
Member Since: 09/12/04
2 lifetime posts
Trying to sell my town house and home inspector for the buyer indicated there was a pressure problem.

I tested water pressure going into washing machine and it read 110psi, but when I turned on the faucet in the bathroom, the pressure dropped to 10psi.

Same problem in the upstairs bathroom. Shower pressure is fine unless you turn on the sink faucet and then they both drop dramatically.

What can cause this? Could it be a faulty Pressure Regulator Valve? Is it pipe problems? With pressure fine when using one outlet, why does it drop when more than one is open.

Any help would be greatly appreciated....


05:11PM | 09/13/04
There is not enough volume to keep the pipes supplied for demand. Certainly and hopefully, the Pressure Reducing Valve is the culprit. They can be adjusted, repaired or replaced. If you have a steel water service it may have closed off from rust inside. Has this situation been developing slowly or did it hit in a short time period?


05:28PM | 09/13/04
Member Since: 09/12/04
2 lifetime posts
Thank you for the reply. The pipes (at least all the ones I can see) are copper. The problem has definitly been for a while at least the last few years. We became numb to it, but when the inspector pointed it out it is really obvious. Not sure if that changes the possible causes or not... I am guessing that the pressure reducing valve would be the easiest fix, but if that is not it, are there other possibilities or other things I can look for?


09:48PM | 09/13/04
The 110 psi is definitely way too high and dropping to 10 is way too low. That points real hard to the PRV. Something is restricting the volume into your structure.

Next you would look to the water service coming into the home. You may have copper inside but what is the line made of coming into the home.
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