A thump the neighbors can hear
In a Reston townhouse the party wall carries a water hammer thud next door. If the same bang shows up every time the washer stops, read the pressure before anybody opens a wall.
Reston, Virginia
Water pressure and pressure reducing valve replacement in Reston.
In Reston, 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 Reston are rated 5.0 stars across 1,130 reviews and work under Virginia Class A contractor license 2705192276. Water pressure and PRV replacement in Reston: first we find out whether the valve is yours, your cluster’s or your building’s, then we read the pressure. 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
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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 Reston.
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 Reston
In Reston, the first pressure question is whose valve it is.
Reston splits almost evenly three ways: about 35 homes in 100 sit in condo or apartment buildings, 30 are townhouses, and only 21 are detached. A pressure call here starts with who owns the equipment. In a mid-rise or tower around Town Center or Lake Anne, the water is often brought down for the whole building by gear the association owns, and inside your unit you may have nothing but a shutoff. In a townhouse of your own, the valve is yours, and nobody else is going to replace it.
The utility is Fairfax Water, which stands behind 20 psi at the main and promises nothing even beyond that. Anything between the meter and your faucets is the customer’s to buy and keep up. Reston also rolls: Lake Anne, Lake Thoreau and the other lakes sit in stream valleys, and a house down near the water usually sees more pressure at the main than one up on a rise, so two neighbors a half mile apart can read very different numbers on the same gauge.
Age sorts the rest. Four homes in ten here predate 1980, including the Lake Anne units that opened in the 1960s, and houses that old often got a reducing valve added later, or never had one. About a third went up in the 1980s and 90s, around North Point and Hunters Woods, and those carry a builder’s valve now past thirty. The quarter built since 2000 usually has a valve and an expansion tank already.
In a cluster townhouse the water heater is often in a hall closet or a small utility room, so a worn valve tends to announce itself as a damp floor under the relief line, or a thump in the wall you share with the neighbors when the dishwasher shuts off. If your pipes are leaking too, our low water pressure guide sorts pressure from pipe trouble.
Neighborhood by neighborhood
What a pressure problem looks like across Reston.
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 |
|---|---|---|---|---|
| Reston | 1981 | condo and apartment buildings, about 4 in 10 | gas, about 5 in 10 | The builder’s original reducing valve, worn. |
| Great Falls Crossing | 1993 | single-family houses, about 9 in 10 | gas, about 8 in 10 | The builder’s original reducing valve, worn. |
By the numbers
Reston houses, by the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
Reston
- Built before 1980about 4 in 10 Census
- Built since 2000about 2 in 10 Census
- Most homes arecondo and apartment buildings, about 3 in 10 Census
- Heated withgas, about 5 in 10 Census
- Rentedabout 4 in 10 Census
- Houses from the 80s and 90s often came with a valve after the main shutoff, and many of those are original and worn.
- 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 Reston house has a pressure problem.
The house is old enough that the valve is too
Many houses built on public water since the 1980s came with a valve right after the main shutoff. A lot of those are the originals, and a valve that old has usually stopped holding the pressure where it was set.
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.
Need water pressure and pressure reducing valves in Reston?
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Choosing who fixes it
How to pick who fixes water pressure in Reston.
Questions to ask anybody who quotes you a valve, us included.
Did they ask whose valve it is?
In a Reston condo, a plumber who quotes a new valve without asking about the building is guessing. The right one asks for your unit, your building and whether the association regulates the supply.
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.
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What our customers say.
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Questions
Water pressure questions from Reston.
Who fixes low water pressure in my Reston condo?
Start with the front office. If the building regulates pressure, the fix is theirs, and if only your unit is weak, we check what sits at your own shutoff and fixtures.
Does my 1960s Lake Anne unit even have a reducing valve?
Maybe not. Units from that era were often built without one, so a gauge on a hose bib or a laundry tap tells you what the building delivers before anyone sells you a valve.
How much is a pressure reducing valve replacement in Reston?
$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 Reston 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.