Yes, a hidden leak can cause low water pressure, especially if it is a larger leak in the main water line or a supply pipe inside the walls. Water escaping through the leak never reaches your faucets, so the flow at your fixtures drops.
How a Leak Lowers Pressure
Your plumbing system is a closed loop under pressure. When there is a break, some of that water takes the easier path out through the leak. A small drip may not change much, but a crack in the main line can make every faucet in the house feel weaker. You may notice it most when two fixtures run at once, like a shower and the kitchen sink.
Other Common Causes of Low Pressure
A leak is only one possibility. Other causes include:
- Mineral buildup inside older galvanized pipes
- A partly closed main shut-off valve
- A failing pressure-reducing valve
- Clogged faucet aerators or showerheads
- Work on the water main in the street
If only one faucet is weak, the aerator or that fixture is the likely cause. If every fixture is weak, look at the bigger system.
How to Check for a Hidden Leak
Turn off all water in the house. Check the water meter and watch the small leak indicator dial. If it moves, water is flowing somewhere. Write down the reading, wait 30 minutes without using water, and check again. A change means you likely have a leak somewhere between the meter and your fixtures.
Also walk your yard between the house and street. Soggy ground or a patch of extra-green grass can point to a leak in the service line.
What to Do Next
A hidden leak that is strong enough to lower pressure is usually losing a lot of water. Finding the leak before it spreads helps protect your foundation, floors, and walls. For pressure problems that do not seem leak-related, you can ask our team about weak water flow at (833) 603-1840.