Low Water Pressure?
Weak water pressure is one of the most common calls we get — and the fix ranges from a five-minute aerator cleaning to a whole-home repipe. This page explains the difference between a single-fixture problem and a whole-house problem, what causes each, and how we track down the real culprit. Streamlined Plumbing, Fairhope, AL · MP-4462 · (251) 423-7654.
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The short version
The first question is whether pressure is low at one fixture or everywhere. One fixture usually means a clogged aerator, a bad cartridge, or a partly closed shutoff — often a quick fix. Whole-house low pressure points to a pressure regulator, a main-line issue, or corroded/scaled pipe restricting flow throughout the home. Clean the aerator on the affected faucet first; if pressure is weak across the house or getting worse, call (251) 423-7654 and we'll find the restriction.
What a low water pressure Actually Means.
At a single fixture, low pressure is almost always something small and local: mineral buildup clogging the faucet aerator or showerhead, a worn faucet cartridge, a partly closed supply valve, or a kinked supply line. These are quick, inexpensive fixes.
Whole-house low pressure is a bigger question. The usual causes are a failing pressure-reducing valve, a partially closed main shutoff, a problem on the supply side, or — the one that matters most long-term — corrosion and mineral scale narrowing aging pipe throughout the home. Old galvanized and polybutylene systems slowly choke themselves off from the inside.
Why You Don't Want to Ignore It.
Beyond the daily annoyance of a weak shower, falling pressure across the whole house is often the visible symptom of pipe that's near the end of its life. Left alone, that same aging pipe tends to start leaking.
A failing pressure regulator can swing the other way too — letting pressure spike high enough to stress fixtures, appliances, and joints, which shortens their life and invites leaks. It's worth diagnosing rather than living with.
If low pressure appeared suddenly across the house, it can signal a hidden leak drawing water away from your fixtures — a problem that's quietly causing damage while it steals your pressure.
What You Can Check Yourself.
- Determine the scope: is it one fixture or the whole house? Hot side, cold side, or both? That answer narrows the cause dramatically — have it ready when you call.
- Unscrew the aerator on the affected faucet and rinse out the mineral grit, then check the showerhead the same way. This alone fixes a surprising share of single-fixture complaints.
- Confirm the fixture's shutoff valves under the sink and the home's main shutoff are fully open — a valve bumped half-closed is a common, easily-missed cause.
- Check whether hot water alone is weak. Low pressure only on the hot side can point to a water heater or its supply line rather than the whole plumbing system.
What to Record About This low water pressure.
For a low-pressure appointment, test hot and cold water separately at a kitchen faucet, a bathroom faucet, and a shower. Record whether the weakness affects one outlet, one side of the system, one floor, or the entire house. Mention any recent valve work, utility interruption, bill change, or visible wet area. Those observations separate an aerator or cartridge restriction from a heater-side issue, regulator trouble, a supply leak, or aging pipe that has narrowed throughout the building.
Describe flow as well as pressure. A faucet that starts normally and fades behaves differently from several outlets that remain uniformly weak. Note whether neighbors have the same issue and whether an exterior hose connection changes when an indoor tap opens. The comparison helps establish whether the restriction begins before the building, at its controls, or farther along an interior branch.
How Streamlined Plumbing Handles a Low Water Pressure.
- We measure the actual pressure at the house and isolate where it drops — supply, regulator, or interior piping — so we're fixing the real restriction, not guessing.
- For local problems we replace worn cartridges, clogged aerators, or failed shutoff valves on the spot. For a bad pressure-reducing valve, we replace and set it to the correct pressure.
- If we suspect a hidden leak is stealing pressure, we locate it with non-invasive equipment before opening anything up.
- When the culprit is corroded or scaled pipe throughout the house, we'll show you honestly why patching won't restore flow and lay out a whole-home repipe in REHAU PEX-a — a corrosion-resistant system that restores full pressure for good.
Preventing a Repeat.
- If you have old galvanized or polybutylene pipe, know that declining pressure is a normal part of its aging — plan ahead rather than waiting for the first leak.
- Clean aerators and showerheads periodically to keep mineral scale from building up, especially given our water.
- Have your pressure regulator checked if you notice pressure swinging high as well as low — catching it protects your fixtures and appliances.
Related Streamlined Plumbing services: Whole-home repipe (REHAU PEX-a), Leak detection, Faucet & fixture repair, and the full Baldwin County service area.
Low Water Pressure — Frequently Asked Questions
Why is my water pressure low in just one faucet?
Almost always a clogged aerator or showerhead, a worn cartridge, or a partly closed shutoff valve at that fixture. Rinse the aerator first — it's the most common cause and a two-minute fix. If that doesn't do it, the cartridge or valve is the next suspect.Can low water pressure mean I need a repipe?
Sometimes. If pressure is weak throughout the house and the plumbing is old galvanized or polybutylene, corrosion and scale inside the pipe are choking the flow, and cleaning fixtures won't bring it back. That's when a whole-home repipe in REHAU PEX-a is the real fix. We inspect first and tell you honestly whether you're there yet.My pressure dropped suddenly everywhere — what happened?
A sudden whole-house drop can mean a partly closed main valve, a failing pressure regulator, a supply-side issue, or a hidden leak pulling water away from your fixtures. Call (251) 423-7654 — if it's a leak, the sooner we find it the less damage it does.