One weak shower, everything else fine
In an older McLean house, a single upstairs bathroom with a trickle and a full-strength kitchen points to rusted supply pipe. The valve is the suspect only when the whole house is off.
McLean, Virginia
Water pressure and pressure reducing valve replacement in McLean.
In McLean, a pressure reducing valve replaced is $500 to $1,000. Call SwiftPro, rated 5.0 stars across 1,130 reviews, at (703) 997-9757, 24 hours a day, 7 days a week.
SwiftPro’s plumbers in McLean are rated 5.0 stars across 1,130 reviews and work under Virginia Class A contractor license 2705192276. Water pressure and PRV replacement in McLean, where a 1950s rambler and a Tysons high-rise answer the pressure question in completely different ways. If the pressure is fine and the trouble is a hidden leak, finding it is $200 to $500. A main shutoff valve is priced at your house, once we’ve seen the pipe it’s on.
- A gauge reading before the price
- Our own licensed plumbers
- Set and tested before we leave
5.0 stars across 1,130 reviews
New copper supply piping with red-handled shutoff valves, installed and tagged by one of our plumbers.
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The price is settled before the workYou see the number in writing before anything is taken apart
What it costs
What a pressure reducing valve costs in McLean.
From the same price book as our plumbing price list: the valve, the fittings, setting it with a gauge and checking the house afterward. More on what causes it in our low water pressure guide.
Pressure reducing valve replacement
$500 to $1,000
Leak detection
$200 to $500
Prices checked .
Where you land in the range is mostly where the valve sits and what it’s attached to: a valve right at the main shutoff in an open basement is the easy end, one behind a finished wall or on corroded pipe is the other.
When a new valve brings the pressure down, the water heater can no longer push its expansion back into the street, so we check for an expansion tank on the same visit and tell you if the house needs one.
What’s different in McLean
In McLean, a new house on an old lot can still be breathing through an old pipe.
McLean’s valves come from a wider spread of years than anywhere else we work. Roughly one owner home in eight went up before 1960, nearly a third were built since 2000, and the town sits on the Washington Aqueduct’s supply through Fairfax Water. That utility holds 20 psi at the main and no steadier pressure beyond it, and everything past the meter is yours: the shutoff, the reducing valve, the fittings.
The postwar ramblers and split-levels in 22101 are where we find the odd cases. Many were plumbed in galvanized steel, which rusts shut from the inside, so an upstairs shower can run weak even when the pressure at the main is strong. If your pressure is low in only one bathroom, that is the pipe, not the valve. If it’s low everywhere, or the house bangs, the valve is the first suspect.
Teardowns and big additions change the answer again. A new house on an old McLean lot usually gets a new valve with the new work, but a renovation that keeps the old service line often keeps whatever sat on it, and the owner can’t tell by looking at granite and tile. The gauge at the hose bib tells you what the house gets, however new the kitchen.
Up in the Tysons towers, close to half of 22102 lives in buildings of fifty units or more, and the water is generally brought down in stages by the building’s equipment, which belongs to the association. A weak or too-strong tap inside a unit gets a call to the front desk first. We come in when it’s your own shutoff, fixture or supply line.
Neighborhood by neighborhood
What a pressure problem looks like across McLean.
Census figures for the owner-occupied homes in each place, and what usually sits at the main shutoff in houses like them.
| Place | Median home built | Most homes are | Heated with | What’s usually at the main shutoff |
|---|---|---|---|---|
| McLean | 1977 | single-family houses, about 8 in 10 | gas, about 7 in 10 | An old gate valve, often no reducing valve. |
| Tysons | 1985 | condo and apartment buildings, about 7 in 10 | electricity, about 5 in 10 | The builder’s original reducing valve, worn. |
By the numbers
McLean houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
McLean
ZIPs 22101 and 22102 as a whole: every McLean address, Tysons included.
- Built before 1980about 4 in 10 Census
- Built since 2000about 3 in 10 Census
- Most homes aresingle-family houses, about 5 in 10 Census
- Heated withgas, about 7 in 10 Census
- Rentedabout 4 in 10 Census
- Many homes here are townhouses or condos. A townhouse usually has its own valve near the meter; in a condo building it may be the building’s, so the association is the first call.
The signs
When a McLean house has a pressure problem.
Pipes bang when a faucet shuts
A thud in the wall when the washer or a faucet closes is water hammer, and high pressure makes it worse. So does a toilet that keeps refilling, or faucets that drip no matter how many washers go in.
The pressure dropped and stayed low
When every faucet in the house went weak at once, the valve at the main is the first suspect. They wear out and can fail closed, and a stuck valve feels exactly like the water company turned you down.
Need water pressure and pressure reducing valves in McLean?
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Choosing who fixes it
How to pick who fixes water pressure in McLean.
Questions to ask anybody who quotes you a valve, us included.
Did they tell you which it is, valve or pipe?
In a 1950s McLean house, a pressure complaint can mean either one. A plumber who reads the gauge and then follows the pipe to the weak fixture saves you from a valve that fixes nothing.
Did they put a gauge on it before the price?
A valve quoted without a pressure reading is a guess. Ask what the house reads now, static and with water running, and what they’ll set it to.
Did they ask about the water heater?
A new valve changes how the water heater handles expansion. The plumber who checks for an expansion tank is the one who saves you a dripping relief valve next month.
Two of our crew going over a work order before the day's calls.
From our Google reviews
What our customers say.
5.0 stars across 1,130 reviews. Read them on our reviews page.
Polite, courteous, professional, and without any hard sell pressures.
- 5.0stars across 1,130 reviewsHow we count them
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- 2026Voted a Nextdoor Neighborhood Faves winner two years running: 2026 in 30 Northern Virginia neighborhoods, 2025 in Emerald Chase (Herndon) and Hunters Run (Chantilly)See it on Nextdoor
- #1BusinessRate Best of 2026: the top-ranked heating contractor in Fairfax, VirginiaSee our BusinessRate score
- Class AVirginia contractor, license #2705192276Look it up with DPOR
Where we work
Water pressure and pressure reducing valves in every Northern Virginia town we serve
Next door to McLean: Falls Church, Oakton, Annandale, Reston and Herndon.
Fairfax County
Arlington County
Loudoun County
Prince William County
Fauquier County
Stafford County
Every town on one page
Questions
Water pressure questions from McLean.
I rebuilt my McLean house. Does the valve need checking?
Read it once. A new house usually has a new valve, but a renovation that kept the old service may have kept the old valve too, and a two-minute gauge reading settles it.
Who owns the pressure valve in a Tysons condo?
Usually the association owns the equipment that regulates the building. Your unit’s own shutoff and fixtures are yours. Your documents say which, and the front office can tell you quickly.
How much is a pressure reducing valve replacement in McLean?
$500 to $1,000, with the valve, the fittings and setting it with a gauge in that number. Where you land depends on where the valve sits and the pipe it’s on.
What should my water pressure be?
Most houses run well somewhere around 50 to 70 psi. The Virginia Residential Code calls for a reducing valve once the street pressure tops 80 psi. We read it with a gauge on a hose bib so you know your own number.
Ready when you are
Find out what the pressure really is.
Call, or send the form at the top. We put a gauge on the house, show you the number, and you get the price in writing before any valve comes out.
SwiftPro Heating, Cooling & Plumbing
4230 Lafayette Center Dr N, Chantilly, VA 20151
44679 Endicott Dr, Suite 211, Ashburn, VA 20147
SwiftPro Plumber & Water Heaters
4200 Lafayette Center Dr, Suite N, Chantilly, VA 20151
Virginia Class A contractor license #2705192276
SwiftPro Heating, Cooling & Plumbing is a licensed, BBB Accredited (A rating), independently owned heating, cooling and plumbing company in Chantilly, serving McLean and the rest of Northern Virginia. Virginia contractor license #2705192276. 5.0 stars across 1,130 reviews on Google, Angi, Yelp, the BBB and Facebook. SwiftPro maintains a dedicated HVAC team and a dedicated plumbing team.
From SwiftPro Heating, Cooling & Plumbing in Chantilly. Housing figures are the Census Bureau’s American Community Survey, 2020 to 2024, for each place named; permit, water and sewer facts link to each office’s own page and were checked in September and October 2026.