Water Line Repair & Replacement
Fix or replace the buried supply pipe running from the meter to your foundation.
Homeowner tips
Low Water Pressure in Westminster, CO: Causes and Fixes
Start by deciding whether the weak flow is at one fixture or the whole house. A single fixture means the fixture itself is at fault, while a house-wide drop suggests the supply or a valve.
By the Westminster Plumbing Co. team ·
One fixture or every fixture?
Run water at several taps and compare. If only one is weak, the problem sits at that faucet or showerhead. When all taps are weak, suspect the main valve, a pressure regulator or the service line.
Hot only or cold only also matters. Weak hot water points to the water heater, its valves or a sediment-clogged line.
Aerators and showerheads
Mineral scale builds in aerators and showerheads. Unscrew the aerator, rinse it and soak it in vinegar. Do the same with the showerhead. Hard water makes this a regular chore.
Westminster's water has moderate hardness, about 7 to 8 grains per gallon. Scale builds slowly, but it builds.
Low pressure symptoms and likely causes
Match how the weak flow behaves to a likely cause.
| Symptom | Likely cause | First step |
|---|---|---|
| One tap weak | A clogged aerator or cartridge | Clean the aerator, check the cartridge |
| Hot side weak only | Sediment or a closed heater valve | Open the valves, flush the heater |
| Whole house weak | Main valve, regulator or the service line | Check the valve and read the pressure gauge |
| Weak after street work | A city-side issue | Ask neighbors, then call the utility |
Valves and regulators
Check that the main valve is fully open. A partly closed valve after earlier work cuts flow in the whole house. Many homes also have a pressure reducing valve near the main, set to protect the plumbing.
When that valve wears out, pressure can drop or spike. A gauge on a hose bib shows the actual pressure. A plumber can adjust or replace the valve.
Pipes and the service line
Galvanized steel pipe corrodes from the inside and narrows over time. Water flow falls off slowly, and you may see rusty water. The cure is replacement of the affected pipe, or repiping.
A leak in the service line between the meter and the house also lowers pressure. A wet stripe in the yard or a meter that moves is a clue.
City supply issues
Westminster notes that adequate pressure matters for fire protection and customer demand. If your neighbors also have weak flow, or the weak flow began after street work, call the utility.
If only your house has low pressure, the cause is probably on your side of the meter.
When to call a plumber
Call if the pressure drops in the whole house, if you hear water moving at night or if the meter turns with everything off. A plumber can test pressure, trace pipes and repair or replace the failing part.
Note when the problem began, whether it came with a change such as a repair or a storm and which fixtures are affected.
Testing the pressure yourself
A simple gauge that threads onto an outdoor hose bib shows the real pressure in pounds per square inch. Most homes run between roughly forty and eighty. A reading far below that range points upstream, while a normal reading with weak taps points to something inside the house.
Take the reading with no water running anywhere, then again with a tap open. A big drop under load suggests a restricted line, a partly closed valve or a tired regulator. Write both numbers down so a plumber can use them.
Fixes that cost little
Start with the cheap items. Unscrew aerators and soak them in vinegar, descale a showerhead and make sure the main valve and the meter valve are fully open. A valve that was left half closed after earlier work is a surprisingly common cause.
If those steps do nothing, the next candidates are a failing pressure reducing valve, corroded galvanized pipe or a partly blocked service line. Each of these needs a professional, but the simple checks above save a service call when they work.
When the problem is the supply line
A galvanized line slowly narrows as mineral buildup grows inside. Flow drops a little each year until showers dribble and the washer takes ages to fill. Cutting a section open often shows a pipe that is half closed.
In that case the fix is replacing the affected run, not adjusting a valve. Copper or PEX restores full flow, and the contractor can often limit the opening in walls by choosing routes carefully.
A leak in a buried service line also reduces pressure, usually with a wet patch in the yard or a rising water bill. Test the meter before assuming the pipe has simply aged.
What a contractor will measure
A good diagnosis uses numbers. The technician reads static pressure with a gauge, then dynamic pressure with water running, and compares the two. The gap shows how much flow the pipes can deliver.
They will also check the regulator setting, look at the age and material of the supply pipe and test individual fixtures. Ask for the readings in writing so you can see what was found and how the repair addresses it.
Pressure after a plumbing repair
Low flow right after work was done on the house often means a valve was left partly closed or debris loosened by the work is clogging an aerator. Check the main valve first, then remove and rinse aerators and showerheads.
Sediment stirred up by shutting off the water can also lodge in a cartridge or a washing machine screen. Cleaning these small parts solves a surprising number of calls, and it costs nothing.
Common questions
Answers about low water pressure
Scale in the showerhead or a clogged cartridge is the usual cause. Clean or replace the head.
Yes. A leak in the service line or inside the walls diverts flow and lowers pressure at the taps.
A bell-shaped valve near the main that keeps incoming pressure at a safe level. It can wear out.
Not always. If neighbors are affected too, call the utility. If only your house is, look at your own plumbing.
Related services
Repiping & Whole-Home Pipe Replacement
Swap out aging galvanized, polybutylene or pitted copper supply pipe across an entire house.
Leak Detection
Trace a hidden leak behind a wall, under a slab or along the buried line before any wall has to be opened.
Keep reading
Water hammer: why pipes bang
Banging pipes when a valve closes have a simple physical cause and a few common fixes.
PEX vs copper pipe: which is better?
PEX and copper both work. The choice depends on cost, freezing risk, water chemistry and how the pipe will be run.
Finding a hidden water leak at home
A moving meter, a damp basement wall or a bill that jumped. A handful of quick tests tells you whether you have a leak and roughly where.
Pressure dropping at every tap?
Call and describe which fixtures are weak and whether the meter is moving. The dispatcher then matches you with a nearby contractor.