Low Water Pressure Repair in San Antonio, TX

What Low Water Pressure Means in a San Antonio Home

Low water pressure means water arrives at your fixtures with less force than your home was built for. Most homes are designed to run at about 40 to 60 PSI (pounds per square inch) at the fixtures. Below that range, showers turn to a trickle, washing machines take longer to fill, and toilets refill slowly. The problem is rarely the water coming into your neighborhood. It is usually something inside your home's own plumbing — and that is good news, because it can be found and fixed.

In San Antonio, low pressure has a local pattern. Water supplied by SAWS (San Antonio Water System) is very hard, about 280 to 300 parts per million, and it comes through limestone country fed by the Edwards Aquifer. Hard water leaves mineral scale inside pipes, aerators, showerheads, and valves. Over years, that scale narrows the inside of a pipe the same way a clogged artery narrows. Add in the galvanized steel pipe still found in many homes built before the 1960s, and a pressure problem that starts small can get worse every year.

That is why a quick fix at one faucet often does not last. The real fix starts with water pressure testing and diagnosis — measuring pressure at several points in your home to find out whether the problem is at one fixture, in one part of the house, or across the whole home. Once we know the cause, the repair is usually one of a small set of jobs: a pressure regulator (PRV) repair or replacement, a booster pump installation, pipe descaling, leak detection and repair, or whole-house repiping for pipes that are too far gone to clean.

Signs You May Need Low Water Pressure Repair

Call us if any of these sound familiar. One sign on its own can be a fixture problem; several together usually point to a system problem.

• The shower is weak, but the kitchen sink is fine. The problem is often at the shower itself — a clogged showerhead, a worn cartridge, or a partly closed valve. See fixture low pressure repair.
• Every fixture in the house is weak. The cause is usually near where water enters the home: a failing pressure regulator, a partly closed main shutoff, or a restriction in the main line.
• Hot water pressure is weak, but cold water is fine. Sediment or scale in the water heater or in the hot-water lines is a common cause in San Antonio's hard water.
• Pressure drops when two fixtures run at once. Only one fixture can run at a time when a pipe is narrowed by scale or corrosion.
• Pressure is low upstairs and fine downstairs. Elevation and pipe routing matter. A second floor needs enough pressure to lift water, and a failing regulator or an undersized line shows up there first.
• Pressure changed suddenly. A sudden drop can mean a leak, a valve that was bumped partly closed, or work on the street main. If water is leaking, turn off the main shutoff valve first, then call us.
• White crust on faucets and showerheads. That crust is mineral scale from hard water — the same scale building up inside your pipes.

Why Water Pressure Drops in San Antonio Homes

Most low-pressure calls in San Antonio come down to one of these causes. Knowing which one you have is the whole job — the repair follows from the cause.

Hard-water scale

At 280 to 300 parts per million, San Antonio water is among the hardest municipal supplies in Texas. Scale forms inside pipes, on aerators, and in showerheads. A pipe descaling job, or a water softener installation to stop scale from forming again, is the answer when the pipe itself is still in good shape.

Old galvanized pipe

Homes built before the 1960s were often plumbed with galvanized steel pipe. Inside, it rusts and closes up over decades. When a galvanized line is badly narrowed, cleaning will not restore it — the line needs to be replaced. That is the job of whole-house repiping, and it is the most common fix in the city's older neighborhoods, including Alamo Heights and Monte Vista.

A failed pressure regulator

The pressure regulator, or PRV, is the bell-shaped valve near your main shutoff that steps street pressure down to a safe level for your home. When it wears out — often after 10 years or more — pressure usually drops across the whole house. PRV repair and replacement is a common, straightforward job.

A hidden leak

A leak in a supply line lets pressure escape before it reaches your fixtures, and it can also show up as a high water bill, damp spots, or the sound of running water when everything is off. Leak detection and repair finds the leak and fixes it.

Low supply pressure at the street

Some streets and some larger or higher homes simply do not get enough pressure from the main. No repair to the house plumbing can add pressure that is not there. That is when a booster pump is the right answer.

One bad fixture

When only one shower or faucet is weak, the cause is usually local: a clogged aerator, a scaled showerhead, or a worn cartridge. Fixture low pressure repair handles those without touching the rest of the system.

Low Water Pressure Repair Across San Antonio

We serve homes across San Antonio, including these areas, where low water pressure shows up for different reasons. Hard water affects the whole city, but the age and type of pipe change from one area to the next.

• Stone Oak — the city's largest family area in the north. Homes here are mostly from the 1990s and 2000s with PEX and copper pipe, so scale and regulator problems are more common than old-pipe problems.
• Alamo Heights — older homes, many with galvanized pipe still in service. Repiping and descaling are the common jobs here.
• Monte Vista — pre-war homes near the city center, many with original galvanized supply lines that have narrowed over decades.
• Terrell Hills — larger lots and older homes east of Alamo Heights, with the same galvanized-pipe pattern.
• Shavano Park — northwest San Antonio, larger homes from the 1970s onward, where polybutylene pipe and regulator problems are common.

If your area is not listed, call us. We serve homes throughout San Antonio and the surrounding areas, and we will tell you plainly whether we can help with your home.