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In Sterling, 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 Sterling are rated 5.0 stars across 1,130 reviews and work under Virginia Class A contractor license 2705192276. Water pressure and PRV replacement in Sterling, from Sterling Park to Cascades and Lowes Island, where Loudoun Water leaves the valve to you. 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.
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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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Licensed and insuredVirginia Class A contractor #2705192276
24/7 emergency serviceWe answer day or night, and we will tell you honestly when we can get there.
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What it costs
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 Sterling
More than half of Sterling homes went up between 1980 and 1999, and another one in five is older than that. A reducing valve from those years has held back the street for thirty to forty-five winters. Trade rule of thumb is that they run something like fifteen to twenty-five years, so the useful question in Sterling isn’t whether the valve is old. It’s whether anyone has changed it. A bright brass body beside a dull 1985 main shutoff is a replacement. A chalky green bell with the builder’s label still on it is the original.
Loudoun Water’s rules leave the regulator to the customer, so when yours stops holding, the repair is a plumber’s, not the utility’s. Where you live changes the starting number too. Cascades and Lowes Island run down toward the Potomac, and lower ground generally means higher static pressure than a house up on the rise, a bit under half a pound for every foot of drop. That’s physics, not a promise about your street, and a gauge on your own hose bib is the only reading that counts.
Townhouses are about a third of Sterling homes. In a row, the valve is inside your own unit by the main shutoff, and it’s yours. Condos are another one in seven, and in the stacked buildings around Dulles Town Center and Kincora a single building valve may serve every unit, which makes it the association’s. Ask management which you have before anyone buys a part.
In the oldest Sterling Park houses the main shutoff may be a round-handled gate valve that hasn’t moved in decades, and there may be no reducing valve at all. Don’t crank on a stuck one. If it won’t close, it comes first, because a valve can’t be swapped on a line that can’t be shut off. What that costs is decided at the house once we’ve seen the pipe.
Neighborhood by neighborhood
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 |
|---|---|---|---|---|
| Sterling | 1979 | single-family houses, about 5 in 10 | electricity, about 5 in 10 | An old gate valve, often no reducing valve. |
| Lowes Island | 1996 | single-family houses, about 6 in 10 | gas, about 7 in 10 | The builder’s original reducing valve, worn. |
| Cascades | 1996 | townhouses, about 4 in 10 | gas, about 8 in 10 | The builder’s original reducing valve, worn. |
| Sugarland Run | 1983 | single-family houses, about 6 in 10 | gas, about 5 in 10 | The builder’s original reducing valve, worn. |
| Dulles Town Center | 1998 | condo and apartment buildings, about 5 in 10 | gas, about 9 in 10 | The builder’s original reducing valve, worn. |
| Arcola | 2017 | townhouses, about 5 in 10 | gas, about 8 in 10 | A reducing valve and an expansion tank. |
| Oak Grove | 2005 | townhouses, about 8 in 10 | gas, about 9 in 10 | A reducing valve and an expansion tank. |
By the numbers
From the Census Bureau’s 2020 to 2024 survey. Median year built and heat count owner-occupied homes only.
The signs
In a Countryside or Lowes Island house from the 1980s, a toilet that keeps trickling or a faucet that spits when it opens can be pressure pushing past worn parts. Read the pressure before replacing the third fill valve.
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.
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 Sterling?
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Choosing who fixes it
Questions to ask anybody who quotes you a valve, us included.
In a Sterling house from the 1980s the valve may be the original or may be its second. A plumber who looks for the date and the brand reads that history before quoting.
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.
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
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Polite, courteous, professional, and without any hard sell pressures.
Questions
No. Its rules put the regulator on the customer. If the pressure is poor up and down your whole street, the utility is worth a call. If it’s only your house, start with the valve.
Look where the water line enters, beside the main shutoff. A brass body shaped like a bell with an adjusting bolt on top is the valve. A house from the 1960s with no bell may never have had one.
$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.
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
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 Sterling 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.