Backflow Prevention Installation for Greenbelt
Drinking water is meant to travel one way. When pressure in the main drops, an unprotected connection can pull dirty water back toward the tap. We fit the assembly the hazard calls for and set it up so it can be tested every year.
Greenbelt began in the late 1930s as a federally planned New Deal town. Its oldest buildings are attached rowhouses and small apartment buildings, with later houses and newer construction filled in around them, and backflow work tracks that mix closely. A single-family house with a garden hose needs very little. A small apartment building with a boiler, or a restaurant with a soda line and a dish machine, needs an assembly a certified tester can open up and check.
Backflow happens when pressure on the public side falls below the pressure inside a building, say during a water main break or heavy draw from a hydrant, and water in your piping runs the wrong direction. A backflow assembly holds the line against that. Our part is putting the correct one in the correct spot, with enough room around it to work on it later.
Which Greenbelt properties need a testable assembly
The first thing we sort out is the hazard behind the connection, because the hazard decides the device. Most of the testable assemblies we install around Greenbelt protect one of these:
- Multi-unit buildings, where one service feeds many apartments plus a mechanical room
- Restaurants and offices with carbonators, dish machines, or chemical feed equipment
- Lawn irrigation systems, with heads sitting in fertilized soil and puddled water
- Boilers, where treated water must never find a way into the drinking supply
- Fire lines on buildings large enough to carry sprinklers
When a hose-bib vacuum breaker is enough
For an ordinary house, the realistic risk is a hose left lying in a bucket of soapy water or attached to a sprayer of weed killer. A vacuum breaker on each outside faucet handles that, and we will tell you so instead of selling you a bronze assembly you have no use for. Add an irrigation system or a boiler and the answer changes, and we will walk you through why.
Either way, a licensed Master Plumber looks at the setup before any price gets quoted. Request a free quote for your building, or browse our gallery of finished jobs to see how we leave a mechanical room.
RPZ or double check, matched to the hazard
Two testable assemblies cover nearly every Greenbelt property that needs one, and they are built for different levels of risk. A double check valve assembly uses two spring-loaded checks in series. It suits a low hazard connection, where anything that flowed back would be unpleasant without being toxic, which describes many lawn sprinkler setups and some fire lines.
A reduced pressure zone assembly, the RPZ, adds a relief valve between the two checks. If either check leaks, the relief opens and dumps water to the floor before it can travel upstream. That is the device for a high hazard such as a boiler with treatment chemicals or a commercial kitchen, and it is also the one that needs a drain close by, because when it relieves, it relieves a lot of water.
Four things decide the choice for us on every job:
- What sits on the far side of the connection, and whether it could make someone sick
- Whether the line can see back-pressure from a pump or boiler, or only back-siphonage
- What the water utility requires for that type of property
- Where the assembly can sit with a drain beside it and room to test
Installed so a tester can actually reach it
An assembly has to be reachable for its yearly test. We set every one with a shutoff valve on each side, so water can be held while it is checked or repaired, and we turn the test cocks where a gauge can attach without anyone lying on the floor. An RPZ goes at a height that keeps its relief port well clear of the floor and any standing water, with a drain or air gap sized to take a full discharge.
Then we flush the line, open it back up, and confirm the pressure downstream is what the building needs. In an older Greenbelt rowhouse or apartment building the mechanical space is usually tight, so we plan the layout before we cut anything, and the room gets swept and wiped down before we leave.
Yearly tests and what a fail means
A testable assembly gets tested once it is installed and then every year after that. A failed test usually means a check valve is not seating, often because scale or debris has lodged against it, or a relief valve has worn. On its own, a fail is no sign that anything has flowed back. The assembly needs cleaning, new rubber parts, or replacement, followed by a retest to prove it holds.
The credentials behind the install
Backflow is code-sensitive work, and credentials matter more here than on most jobs. Jackson Plumbing holds Master Plumber license PLM40000116, Maryland license 109495, Virginia license 2710083375, and WSSC credential P-83640, along with ASSE certification and a BBB A-rating. On a Greenbelt property served by WSSC, that means the person installing your assembly is qualified to work on the very connection it protects.
Brandon has been in this trade since he was sixteen, starting next to his uncle in New York, and close to thirty years later he still answers the phone himself. If an assembly we installed gives you trouble down the road, call and we come back to look at it. Building something bigger? Our commercial system installation work in Greenbelt includes backflow on the incoming service, or send us the details and we will get back to you.
A short drive from our Suitland shop
Greenbelt is a quick run up from Suitland, so an assembly install or a retest after a repair never turns into a long wait. We cover the rest of Prince George's County too, homes and businesses alike.
Book a free quoteWhat customers say about Brandon
He is a man of his word. He shows up when he says he is coming and he cleans up behind himself.
T. T.Google ReviewsBrandon Jackson is one of the best plumbers I have ever met. He is professional, honest…
Celestine RobinsonGoogle ReviewsTheir service was prompt, professional, and reliable. The pricing was fair, with no hidden fees.
Wesline ReynaGoogle ReviewsBrandon was extremely knowledgeable and professional from the moment he arrived.
M. Owens JonesGoogle ReviewsBackflow questions from Greenbelt property owners
Does my house need a backflow preventer?
Most single-family homes need only a vacuum breaker on each outside faucet. A house with a lawn irrigation system, a boiler, or a fire sprinkler line is different, and that connection usually needs a testable assembly. We look at your setup and tell you which applies before we quote anything.
What separates an RPZ from a double check?
Both use two check valves in a row. An RPZ adds a relief valve between them that discharges water if either check fails, which makes it the right device for high hazard connections like boilers and commercial kitchens. A double check suits lower hazard lines, including many irrigation systems.
How often does a backflow assembly need testing?
Testable assemblies are checked when they go in and then every year after that. We set each one up with the test cocks and shutoff valves within easy reach, so the yearly test goes quickly and nobody has to rework the piping before a gauge can go on it.
My assembly failed its test. Is my water unsafe?
A failed test means a part inside the assembly is not holding, usually a check fouled with debris or a worn relief valve. It needs prompt repair, and by itself it is no proof that anything flowed back. We clean, rebuild, or replace the assembly, and then it gets retested.
Why does an RPZ need a drain next to it?
When an RPZ relieves, it can put a lot of water on the floor in a hurry. That discharge is how it protects you, so it has to go somewhere safe. We plan the location around a floor drain or an air gap able to take it before the assembly goes in.
Are you licensed for backflow work in Greenbelt?
Yes. Brandon holds Master Plumber license PLM40000116 and WSSC credential P-83640, plus ASSE certification and Maryland and Virginia licenses. The business carries a BBB A-rating, and Greenbelt sits inside our regular Prince George’s County service area.
What should I watch for at the tap?
Cloudy water, an odd smell, or a strange taste right after the pressure drops or service comes back on can point to backflow. Run the cold tap for a few minutes. If it does not clear, stop drinking it and call (202) 840-1998 at any hour.
Need an assembly set or replaced?
Tell us what the line feeds and we will tell you what it needs, with the price up front and no hidden fees, day or night.