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Low Water Pressure in the House? Here's Why
Whether it's one faucet or the whole house tells us a lot. A single slow fixture is usually a quick fix; low pressure everywhere points to something bigger.
Why Your Water Pressure Dropped
The first question with low water pressure is simple: is it one fixture or the whole house? A single slow faucet or showerhead is almost always a clogged aerator or a worn cartridge — a quick, cheap fix. Low pressure everywhere at once points to the main supply side: the pressure regulator, a partially closed valve, or a supply-line problem.
Sudden whole-house pressure loss is worth attention — it can signal a failing pressure-reducing valve or, less often, a leak in the supply line. A gradual drop over years is usually mineral buildup narrowing older galvanized pipes. We start by isolating where the drop actually happens.
Common Causes
Clogged aerator (one fixture)
If only one faucet or shower is weak, it is usually a clogged aerator or a worn cartridge — the cheapest and most common cause, often a same-visit fix.
Failing pressure-reducing valve
The PRV where water enters your home can fail and drop pressure everywhere at once. A common cause of sudden whole-house low pressure.
Partially closed main valve
A main shutoff or meter valve that is not fully open throttles the whole house. We check the simple, free causes before the expensive ones.
Old galvanized pipe buildup
In older South Shore homes, decades of mineral scale narrow galvanized pipes and slowly choke flow. The long-term fix is repiping the affected runs.
Common Questions
Why South Shore homeowners choose Johnson Bros.
Talk to a licensed South Shore plumber
Tell us what's going on. We'll triage it and give you a clear next step — repair, replace, or a quick fix.
Need help fast? Call for urgent plumbing issues. Booking online is best when you want the next open appointment without waiting on the phone.
Can't talk right now? Get a callback.
How We Work
Clear communication, licensed work, and local support.
Licensed Plumbing Work
Massachusetts-licensed plumbing support backed by insured crews.
Fast Scheduling Updates
We tell you what timing is available and keep you updated if the schedule shifts.
Upfront Options
You get a clear explanation of the work and price before the job begins.
Repair-First Guidance
We help you understand whether repair, replacement, or follow-up service makes the most sense.
Talk to a licensed South Shore plumber
Tell us what's going on. We'll triage it and give you a clear next step — repair, replace, or a quick fix.
Call for urgent help now. Book online when you want the next available fit for your schedule.