Plumbing in the Home/water pressure


I tested my water pressure and found that while it was 71 psi which the water company told me was normal for my location it spiked up to 120 psi. I believe it occurred at night. My gauge shows the highest pressure that was reached as well as the live pressure. The guy at the water co. told me it would unlikely fluctuate that much maybe 10psi. What is your opinion on this.

Hi Brad,
By code a regulator is required if the pressure is "ever" 80psi or of course higher...There are several factors that affect the pressure at any given time the main factor is combined usage on the system or more simply stated "if a lot of people are using water at the same time it will cause the pressure to drop.
Having said that, the water company should know what the maximum pressure is and obviously if it is 71 during usage hours it is going to go over 80 in the low usage periods and easily can fluctuate more than 10psi; this leads me to believe you talked to someone that had little knowledge of the system....
Bottom line is you should have a regulator installed and I prefer to see the maximum held at 65psi or a little less. BUT you have to bear in mind that a regulator is a mechanical appliance and as such will not last forever and does require maintenance on a regular basis; I recommend checking the pressure ever 3-6 months and service the regulator yearly. Fact is that most regulators will fail within two years and often more frequently.
I could continue on this topic indefinitely but it would all be speculative as I do not know where you are, how big your water system (company)is or many other things that would help understand the problem.
Some Cities will provide a free water regulator (usually just one-time) but unfortunately this practice is not very wide spread...doesn't hurt to ask but regardless I would strongly suggest that you have a regulator installed soon.
Good Luck

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Cortez (cort) Cate


PLEASE read this entire introduction. I have been doing this for a long time and I have come to the conclusion that if you are not willing to take the time to write a detailed question then don't expect a detailed solution! I am getting far to many questions that do not give enough detail to warrant a good solution. I realize it is a little difficult to formulate a good question but if you want a good answer you have to give me good this entire introduction please....remember this website is world wide I have no clue where you live if you don't tell give more detail on the fixture you are having problems with...a one piece eljer 3.5 gallon flush will be totally different than a one-gallon flush toto.....details are important. I can answer most questions related to residential and commercial plumbing for many buildings. I have sufficient knowledge of the UPC and UMC. I will speculate for you if necessary. In those cases I will try to give you some guidance and you should use that to refine the question further and we, together, can seek the answer via a follow up. Plumbing codes and practices vary around the world--If you don't tell me where you live the answer I give may not fit your locality. I am giving my time to you as a way of fulfilling my perceived obligation to share. I am here to try to help you find a solution to your problem. REMEMBER, If you want a good answer you need to ask a detailed question and include where you live, type of pipes, type of building, water pressure if it is a water problem, type of heater, age of appliance & building all these and many more are variables that have an effect on various situations. Detailed information will help produce a better answer.


Since 1972 a California licensed B-1 General Building Contractor, C-36 Plumbing and C-16 Fire Sprinkler Contractor; also installing and servicing Heating, Air Conditioning and Sheet Metal operating as C and C Building and Plumbing, California State License 279516. In 1995 I downsized the company to become semi-retired. Still I remain active in the construction industry. As head of a company I placed personnel and job safety as the number one objective followed closely by training and continuing education. Always seeking to stay informed of leading edge technology in the industry. Also I have spent several years as an Apprenticeship Instructor in the Pipe Trades Unions. Additionally I am a certified OSHA instructor.

United Association of Plumbers and Steamfitters Instruction Training, Ann Arbor, MI Bakersfield College, Bakersfield CA Cal Poly San Luis Obispo, San Luis Obispo, CA Foothill College, Los Altos, CA California Licensed Contractor from 1971

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