The Why(S) Of Low Water Pressure
Most old homes have pipes made of galvanized steel. These pipes corrode over the years. The corroded matter accumulates on the inside surface of the pipes and reduce its cross section. This restricts the flow of water. But there is a household remedy for this unless the situation is too bad. The corrosion usually builds up behind restrictions in the pipe, such as the angle valves under the sinks, shower or bath valves. Turn off the water to the house form the main supply. Take two wrenches. Open the valve with one of them and use the other one to not let the pipe move. You will see corroded material inside the pipe. Take it out with a screwdriver and restore the valves.
Faulty pressure regulator
This is device that almost looks like a bell. They are found near the water connection in front of your home. These are pre-set by the manufacture so they do not need any adjustment. However if they have become defective, they can affect the pressure of water. You have to get a plumber to get your pressure regulator replaced in this case.
Debris and mineral build-up in pipes
If the quality of water in your area has a high content of sand, dirt, and pollutants, these will enter your house’s pipes when a water main fractures. Even without a fractured line, some amount of this debris will get inside your pipes with the water and cause sediment built-up. This will block the water from flowing in full-force. In this case plumbing chemicals are used that break down and flush the debris.
If you have leaky pipes in the house then the water pressure will go down. This is because the water is going out from elsewhere instead of coming to the faucet. To confirm a leakage, turn off all of the water taps both inside and outside of your home. Record the reading on the water meter. Go and check the recording again after a few hours. If the level has gone down then water is leaking out from somewhere. You have to call a plumber to get the leak repaired after detecting its location.
Sometimes the low water pressure in the house may not have anything to do your piping system. It may be on account of malfunction in your area's municipal water supply.
Low water pressure is also caused by valves that get accidentally turned off. A kid playing in the lawn or on terrace could have done it. So make sure that the “home” and “customer” valve are turned on.
If none of these problems is the cause of low water pressure in your house, call a plumber. He will be able to determine the problem and get back the lost water pressure by doing the needful.