Low Water Pressure in the House: Causes, Fixes and When to Repipe

Low water pressure in the whole house is different from one weak faucet. Whole-home pressure loss points to the supply side: the regulator, the main line, the pipes themselves or a leak.

Check the pressure regulator first

Most California homes have a pressure-reducing valve near the main shut-off. When it fails, pressure can drop to 30 PSI or spike above 80. A gauge on a hose bib tells the story in seconds.

Corroded galvanized pipes

Homes built before the 1970s often still carry water in galvanized steel. Rust closes the pipe from the inside, so pressure fades year after year and water may run brown. The real fix is a whole house repipe in PEX or copper.

Hidden leaks

A leak in the main line or under the slab steals pressure. If the meter moves with every fixture off, schedule leak detection.

Partially closed valves

It sounds simple, but a main valve or meter valve left half-open after work is a common cause.

Get it diagnosed

Done Wright Plumbing tests pressure, inspects the regulator and main line, and gives you an honest answer on whether a regulator swap, water line repair or repiping is the right move. Call (888) 809-6756.

Related Services

Repiping / Whole House Repipe

If your California home has repeated leaks, rusty water or pressure problems, patching one pipe at a time becomes a losing game.

Water Line Repair & Replacement

The main water line carries water from the meter to your house.

Leak Detection

Done Wright Plumbing uses acoustic listening devices, thermal imaging, tracer gas and pressure testing to find hidden leaks in California homes and businesses — behind walls, under slabs, in yards and pool lines — without tearing your property apart..