A shutoff that won’t quite shut
If the main valve drips at the stem or the handle turns and the water doesn’t stop, the valve is old, and so is whatever sits beside it. Swap them together.
Falls Church, Virginia
Water pressure and pressure reducing valve replacement in Falls Church.
In Falls Church, 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 Falls Church are rated 5.0 stars across 1,130 reviews and work under Virginia Class A contractor license 2705192276. Water pressure and PRV replacement in Falls Church, where the water has been Fairfax Water’s since 2014 and the houses are among the oldest we work in. 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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What it costs
What a pressure reducing valve costs in Falls Church.
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 Falls Church
In Falls Church, a lot of houses are older than the idea of a reducing valve.
The City’s median owner home dates from 1964, and a third of its homes went up before 1960. Houses that age were often built with no reducing valve at all, since the street pressure of the day didn’t need one, and when one was added later it went in on whatever the main shutoff was. That shutoff is often an old gate valve that no longer closes all the way, which is the first thing we test before touching anything.
Fairfax Water bought the City’s water system on January 3, 2014, so the utility is the same inside the City and in Seven Corners, Idylwood and Lake Barcroft. Its rule is the same too: 20 psi at the main, nothing steady beyond it, and the valve on the house side is the customer’s. A reducing valve that was added after the house was built is nobody’s but yours to replace.
Pressure is not the only reason an old Falls Church house runs weak. Galvanized supply pipe narrows from rust until an upstairs shower trickles with the valve working fine. The test is simple: read the pressure with a gauge, and then compare it with what a fixture delivers. High at the gauge and weak at the shower means pipe. Low everywhere means the valve or the main.
Close to half the City’s homes are condos and apartments, and at Seven Corners and Bailey’s Crossroads that number rises, so many calls here turn on who owns what past the street. The county side has Lake Barcroft’s lakeshore houses on the slope, where the lower streets see more pressure than the upper ones. In an association building, the front office is the first call.
Neighborhood by neighborhood
What a pressure problem looks like across Falls Church.
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 |
|---|---|---|---|---|
| West Falls Church | 1957 | single-family houses, about 6 in 10 | gas, about 7 in 10 | An old gate valve, often no reducing valve. |
| Bailey’s Crossroads | 1980 | condo and apartment buildings, about 6 in 10 | electricity, about 5 in 10 | The builder’s original reducing valve, worn. |
| Idylwood | 1975 | condo and apartment buildings, about 4 in 10 | gas, about 5 in 10 | An old gate valve, often no reducing valve. |
| City of Falls Church | 1964 | condo and apartment buildings, about 5 in 10 | gas, about 7 in 10 | An old gate valve, often no reducing valve. |
| Lake Barcroft | 1958 | single-family houses, about 6 in 10 | gas, about 8 in 10 | An old gate valve, often no reducing valve. |
| Seven Corners | 1972 | condo and apartment buildings, about 5 in 10 | gas, about 6 in 10 | An old gate valve, often no reducing valve. |
| Pimmit Hills | 1961 | single-family houses, about 7 in 10 | gas, about 9 in 10 | An old gate valve, often no reducing valve. |
By the numbers
Falls Church houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
The City of Falls Church
ZIP 22046, plus a few City addresses in 22042 and 22044.
- Median home built1964 Census
- Built before 1980about 6 in 10 Census
- Built since 2000about 3 in 10 Census
- Most homes arecondo and apartment buildings, about 5 in 10 Census
- Heated withgas, about 7 in 10 Census
- Rentedabout 5 in 10 Census
- Houses from before 1980 often have no reducing valve at all, or one that was added later, and the main shutoff is often an old gate valve that won’t fully close.
- 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 Fairfax County side
22041 to 22044: West Falls Church, Idylwood, Lake Barcroft, Seven Corners and Bailey’s Crossroads.
The signs
When a Falls Church 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 Falls Church?
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Choosing who fixes it
How to pick who fixes water pressure in Falls Church.
Questions to ask anybody who quotes you a valve, us included.
Did they test the old main shutoff first?
In an older Falls Church house, a valve change starts with a shutoff that closes. A plumber who finds it stuck before the day you need it has done you a favor.
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.
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Where we work
Water pressure and pressure reducing valves in every Northern Virginia town we serve
Next door to Falls Church: Annandale, McLean, Springfield, Oakton and Burke.
Fairfax County
Arlington County
Loudoun County
Prince William County
Fauquier County
Stafford County
Every town on one page
Questions
Water pressure questions from Falls Church.
Who supplies water in the City of Falls Church?
Fairfax Water, since January 2014, the same as the county streets around it. The valve after your meter is the customer’s under its rules.
My 1950s Falls Church house has weak water upstairs. Is it the valve?
Often it’s the galvanized pipe. A gauge tells you: strong at the hose bib and weak at the shower means the pipe, not the valve.
How much is a pressure reducing valve replacement in Falls Church?
$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 Falls Church 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.