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Manassas, VA · Prince William County

Plumber in Manassas, VA

Family-run, father and son, working out of Front Royal and driving the I-66 corridor down to Manassas every week. We pick up the phone, we show up, and we tell you straight what the job needs. Tank and tankless water heaters, drains, sewer lines, leak detection, repiping, gas lines, the whole list.

Residential plumbing work by Ajax Plumbing in Manassas, Virginia

Ajax Plumbing in Manassas

We know the pipe under Prince William County homes


Manassas sits about 35 miles east of our shop in Front Royal. We run it down Route 55 to I-66, past Gainesville and Haymarket, and into Old Town and the neighborhoods that spread out from it. It is a straight, fast drive, which means when a Manassas customer calls with a busted water line or a water heater that quit overnight, we can be loading the truck and out the door without it turning into an all day project.

Manassas is its own independent city wrapped inside Prince William County, with the City of Manassas Park right beside it. That matters for plumbing more than people think. The county and the two cities don’t all share the same water and sewer setup, so what we do at a house off Sudley Road can be a different animal from a place out toward the Bull Run side or a property still running on a private well. We figure out which system you’re on before we quote anything, because the right fix on municipal sewer is not the same fix on a septic line.

The housing stock here is a real mix, and that’s the part that decides what fails. Old Town Manassas has homes that go back generations, with the original galvanized supply lines and cast iron drains that anybody in this trade knows are living on borrowed time. Galvanized pipe rusts shut from the inside, so the water pressure drops year after year until one day the kitchen sink barely runs. Cast iron drain stacks crack and scale until the whole line backs up. On those homes we talk about repiping in PEX or copper and lining or replacing the drains, not patching a section that’s going to fail three feet down the next month.

Then you’ve got the big run of brick colonials and split levels from the building booms, the kind all over Manassas and out into Bristow and Gainesville. Those are usually copper supply with cast iron or early plastic drains, and the things that go on them are predictable. Water heaters reaching the end of a twelve to fifteen year life. Hose bibs and frozen exterior lines after a cold Virginia snap. Slab and crawlspace leaks that show up as a damp spot or a water bill that jumped for no reason. We chase those down with leak detection gear instead of cutting open half a wall guessing.

And then there’s the newer construction filling in around Manassas Park, Bristow, and the Gainesville and Haymarket edge of the county. Those homes are on PEX with modern fixtures, so the failures look different, things like a bad pressure reducing valve, a tankless unit that needs descaling because of the hard water out here, a sump or ejector pump that quit, or fixtures and shutoffs that were builder grade and didn’t last. We work on all of it, new and old, residential and commercial.

Hard water is a real thing across this part of Northern Virginia, and it’s hard on water heaters and tankless units especially. Scale builds inside the tank and on the elements, and a tankless that never gets flushed will start throwing errors and short cycling. We’re certified on most major water heater brands, so whether you’ve got a tank that’s leaking from the bottom or a tankless that needs service, we know the unit before we open it up.

If the trouble is below the floor, we don’t dig first and ask questions later. We run a sewer camera down the line and actually look. Manassas has plenty of mature trees, and tree roots finding their way into an old clay or cast iron sewer lateral is one of the most common backups we clear out here. The camera tells us whether it’s roots, a belly in the line, a crack, or just a clog of grease and wipes, and then we hydro jet it clean or quote the repair based on what’s actually there.

Manassas is the county seat for the courts and a busy commercial center, so we cover businesses too, restaurants, offices, retail, the works. We’re backflow certified for the testing and devices commercial properties need. Whatever the job, you get a free quote and a straight answer first. Need us out there fast? Send us the details or just call.

Bathroom remodel plumbing by Ajax Plumbing in Manassas, VABathroom remodel plumbing in Manassas

What we handle in Manassas

Every plumbing job, one phone call

Water Heaters

Tank and tankless install, repair, and replacement. Certified on most major brands. Leaking tanks, no hot water, tankless descaling for the hard water out here.

Drains & Hydro Jetting

Slow drains and backups cleared. Hydro jetting blasts grease, scale, and roots out of the line so it actually stays open, not just poked through.

Sewer Lines & Camera

Camera inspection before any digging. Root intrusion, bellies, and cracked clay or cast iron laterals are common on older Manassas homes. We repair or replace.

Leak Detection & Repiping

Slab and crawlspace leaks found with detection gear, not guesswork. Full or partial repipes in PEX or copper for homes still on failing galvanized.

Fixtures & Remodels

Faucets, toilets, shutoffs, disposals, and full bath or kitchen remodel plumbing for the older Old Town homes getting brought up to date.

Gas Lines

Gas line install and repair done right and safe, for ranges, water heaters, fireplaces, and grills, residential and commercial.

Water lines and meters by Ajax Plumbing in Manassas, VAWater lines and meters in Manassas

A frozen line in January doesn’t wait for business hours. Neither do we.

Ajax Plumbing runs 24/7 emergency service, and we take 10% off frozen water-line repairs. 45 years of combined experience between a father and son who answer their own phone.

Towns we cover around Manassas

Manassas ParkGainesvilleHaymarketWoodbridgeDumfriesOccoquan
  • Free quotes on every job, with a straight answer up front.
  • Backflow certified for commercial testing and devices.
  • 24/7 emergency for burst lines, no hot water, and backups.

Right here in Prince William County

Manassas & the surrounding map


We run from our shop at 266 Grove Farm Road in Front Royal out to Manassas and the towns around it. Here is where you will find us on the map.

From Manassas we run out to Manassas Park, Gainesville, Haymarket, Woodbridge, Dumfries, and Occoquan across Prince William County. Looking at the whole county? Start at the Prince William County plumbing hub and find your town from there.

Questions from Manassas homeowners

Straight answers, no fine print


Do you actually drive to Manassas from Front Royal?
Yes, every week. It’s about 35 miles down Route 55 to I-66, a clean fast run, so we cover Manassas, Manassas Park, and the rest of Prince William County as part of our regular territory. Call 540-671-5417 and we’ll tell you when we can be there.
My older Manassas home still has galvanized pipe. Should I repipe?
Galvanized supply lines rust shut from the inside, so if your water pressure has been dropping for years, that’s usually why. Once it’s that far gone, patching one section doesn’t help because the rest of the line is going the same way. We’ll look at it, give you a free quote, and lay out whether a partial or full repipe in PEX or copper makes sense for your house.
My sewer keeps backing up. What’s the first step?
We run a camera down the line and look before we quote anything. Around Manassas, tree roots growing into an old clay or cast iron lateral are one of the most common causes, along with grease and wipes. Once we see what’s there, we hydro jet it clean or give you a real number on the repair. No digging blind.
How fast can you get out for an emergency?
We run 24/7 emergency service. Burst line, no hot water, a backup flooding a bathroom, call us and we move. Being a small father and son shop means you reach us directly instead of a call center, so there’s no layer between you and the truck.
Do you take 10% off frozen water-line repairs?
We do. Virginia cold snaps freeze and crack exterior and crawlspace lines every winter around Manassas, so we knock 10% off those repairs. Get the heat back on the area if you safely can, then call us and we’ll thaw and fix the line.
Do you work on commercial properties in Manassas?
Yes. Manassas is the county seat and a busy commercial center, so we handle restaurants, offices, and retail along with homes. We’re backflow certified for the testing and devices commercial buildings need, and we do commercial water heaters, drains, and gas lines.

Need a plumber in Manassas, VA?

Tell us what is going on and a real person calls you back, usually within the hour. The quote is always free.

Rather talk now? Call 540-671-5417, 24/7.

24/7 emergency serviceFree quotesBackflow certified

No charge for the quote. A real person calls you back, usually within the hour.