Mains water supply is a public utility that provides water to a community, typically via a system of pumps and pipes.
What is the pressure of mains water supply?
Mains water supply pressure is typically between 2-4 bars (30-60 PSI). This measurement may fluctuate depending on time of day and/or area of your residence.
Why does the pressure fluctuate?
Water pressure may fluctuate at different times of the day and in different locations depending on where you are situated in regards to the position of the reservoir, water tower or pump.As the above diagram shows, ground level also plays a contributing factor. High pressure is common in low lying areas and low pressure is common in higher lying areas. This is caused by the differences in pressure at various altitudes.
Pressure can vary at different times of the day, as it is affected by the demand from other customers on the same supply line. Mornings and early evenings are the most common times of the day where there is more demand on the water supply which may result in lower pressure.
How can I find out the mains water pressure?
You can check manually by using your water pressure gauge at an outlet closest to the water meter located just outside your property (if installed).This should give you a reading closest to the pressure that is in the mains supply. However, if the communication pipe between the mains supply and your residence is defective, you may get a false low reading.
For an accurate mains pressure reading, contact your water supplier or local council for water. They will be able to tell you the mains pressure and may also be able to inform you of any maintenance work being carried out on the line.
If you do contact your water supplier and they give you a mains water pressure reading, you can compare it with the static water pressure reading you recorded from your outside tap.
If there is a considerable drop in pressure between the mains supply and your outside tap, then you know that there must be a fault with the communication pipe between the mains supply and your residence.
Before you call a plumber out, first check to see if you have a pressure regulator in your system. It may be a simple matter of adjusting this.
Likewise, if your outside tap water pressure is fine but there is a considerable drop in pressure between it and your kitchen tap, say, then you can deduce that there must be a blockage or other kind of defect causing the loss of pressure. By utilising this method, you can help to pinpoint where you are losing pressure in your residence.