You turn on the shower and get a weak stream. The kitchen faucet takes forever to fill a pot. The washing machine runs a 45-minute cycle that should take 30. Low water pressure is more than an inconvenience — it’s a symptom of something in your plumbing system that isn’t working the way it should. And in Encino, there are specific, common reasons why it happens.
Here’s how to diagnose what’s causing your low pressure and when it’s time to call a licensed plumber.
Is It the Whole House or Just One Fixture?
This is the first thing to check because it narrows the problem immediately.
One fixture only. If pressure is low at a single faucet or showerhead but normal everywhere else, the issue is localized. The most common culprit is a clogged aerator (the screen at the tip of the faucet) or a showerhead blocked with mineral deposits. Unscrew it, soak it in white vinegar for an hour, and reinstall. If pressure returns to normal, you’re done.
If cleaning the aerator doesn’t help and the problem is isolated to one fixture, the supply valve under the sink or behind the wall may be partially closed or failing. A plumber can check and replace it quickly.
Multiple fixtures or the whole house. When pressure drops across the entire home, the problem is in the main supply line, the water meter, the pressure regulator, or the pipes themselves. This is where professional diagnosis becomes necessary.
Common Causes of Whole-House Low Water Pressure in Encino
A failing pressure regulator. Most Encino homes have a pressure-reducing valve (PRV) installed where the main water line enters the house. This device regulates the incoming municipal water pressure down to a safe range (typically 40 to 60 PSI for residential use). When the PRV fails, it can restrict flow excessively, causing pressure to drop throughout the house. PRV replacement is a standard plumbing repair — and it’s one of the first things an experienced Encino plumber checks.
Corroded galvanized water supply pipes. If your Encino home was built before the mid-1970s and still has its original galvanized steel water supply lines, internal corrosion is almost certainly restricting flow. Galvanized pipe corrodes from the inside, building up layers of mineral deposits that progressively narrow the pipe diameter. The flow reduction is gradual — you lose pressure so slowly over years that you may not notice until it becomes severe.
This is the same pipe material that causes issues in older Encino homes with drain and sewer lines. The solution for galvanized water supply pipes is typically a full or partial repipe with copper or PEX.
A partially closed main shutoff valve. It sounds simple, but it happens more often than you’d think — especially after a recent plumbing repair. If someone turned the main shutoff valve during a repair and didn’t fully reopen it afterward, the restricted valve reduces flow to the entire house. Check the valve (usually near the front of the house where the main line enters) and make sure it’s fully open.
A municipal water supply issue. Occasionally, low pressure in an Encino home isn’t caused by anything inside the home at all. LADWP maintenance, a main break on your street, or a system-wide pressure change can temporarily reduce supply pressure. You can check for known issues on the LADWP service alert page or call them directly. If your neighbors are also experiencing low pressure at the same time, a municipal issue is likely.
Leaks in the main water line. A leak between the city meter and your house reduces the volume of water reaching your fixtures. If you’re also seeing higher-than-normal water bills or wet spots in the yard near the water line path, a supply line leak is a strong possibility. This requires professional water line repair or replacement.
How a Plumber Diagnoses Low Water Pressure
A licensed plumber starts by measuring the actual pressure at the main line using a gauge at the hose bib closest to the water meter. This tells them whether the incoming pressure from LADWP is adequate (typically 40 to 80 PSI).
If incoming pressure is normal but pressure at the fixtures is low, the restriction is inside the home — in the PRV, the main shutoff, or the pipes themselves. The plumber works through the system methodically to isolate the cause.
If incoming pressure is also low, the issue may be at the meter, in the service line from the street, or on the municipal side.
Repair Options
For a failed PRV, the repair is straightforward — the old valve is removed and a new one is installed, typically in under two hours.
For corroded galvanized supply lines, the solution is a partial or full repipe. Modern repipes typically use PEX (cross-linked polyethylene) or copper. PEX is faster to install and often less expensive because it can be routed flexibly through walls and attic spaces without as many joints and fittings.
For main water line leaks, repair depends on the location and severity. Water line replacement using trenchless methods is an option in many cases, minimizing the disruption to your yard and driveway.
Don’t Live with Low Pressure
Low water pressure affects everything — your comfort, your appliances, your water heater’s efficiency, and the performance of every fixture in the house. And if the cause is a leak or corrosion, ignoring it doesn’t just mean weak showers — it means ongoing water waste and potential property damage.
At American Plumbing And Water Damage Restoration, we diagnose and resolve low water pressure issues across Encino’s residential and commercial properties. We’ll find the cause, explain the fix, and give you a clear price before any work starts.
Call (818) 765-7240 to get full water pressure restored in your Encino home.
