Downtime Treated As Urgent
A fault that stops trading is dispatched as an emergency. Getting you operating comes before the paperwork.
Commercial Plumbing In Gaithersburg, MD
Commercial plumbing for restaurants, retail, offices and multi-unit buildings across Gaithersburg and Montgomery County — grease traps, backflow prevention, storm drainage, commercial water heaters and 24/7 emergency response.
4.9 from 2,979 Google reviews
30+ Years 30+ Years Serving Maryland
24/7 Service 24/7 Emergency Service
WSSC Licensed WSSC Licensed & Insured
Locally Owned Locally Owned and Operated
Commercial Service in Gaithersburg
Different work, not just bigger work
Commercial plumbing is not residential plumbing scaled up. It runs across multiple storeys, it carries loads a house never sees, and in a restaurant or a salon it is part of how the business is allowed to trade at all. The components are different too — grease traps, storm water pumps, grinder pumps and commercial water heaters are things most residential plumbers rarely touch.
Mallick Plumbing & Heating provides commercial plumbing with its own team, including service for commercial water heaters, drains, sewers, pumps and backflow devices.
Schedule Commercial Service
Tell us what you need — we’ll be in touch fast.
Commercial Plant, Properly
Grease traps, grinder pumps, storm water and commercial water heaters — plant most residential outfits decline.
Certified And Compliant
Backflow tested and certified, permits pulled, and the plant put on a schedule that prevents the repeat.
Is a plumbing fault stopping you trading? We dispatch commercial as emergency.
Call (301) 804-6759Go Deeper
Every Kind Of Commercial
A commercial plumbing failure can interrupt operations, affect staff and turn customers away. We focus on restoring service and explaining the permanent repair.
That is why our commercial work is organised around getting you trading again first and finishing properly second — and why the maintenance side exists at all. Most of the failures we attend on commercial sites were visible months earlier on a scheduled inspection.
Grease Traps in Gaithersburg
Kitchen grease interceptors — installation, service and scheduled pumping.
Backflow Prevention in Gaithersburg
Certified backflow prevention that protects the public supply.
Drain Cleaning in Gaithersburg
Commercial drain clearing on lines that cannot be out of service long.
Sewers in Gaithersburg
Sewer service for commercial buildings — cleaning, pumps and inspection.
Grinder Pumps in Gaithersburg
Below-grade waste moved up to the main — installation and repair.
Storm Drainage in Gaithersburg
Keeping surface water off the property and out of the building.
Storm Water Pumps in Gaithersburg
The pumps that make storm drainage work when the ground cannot.
Commercial Water Heaters in Gaithersburg
Commercial-capacity hot water, sized to the building's real demand.
Project control
How a commercial call actually runs
We work with general contractors, property managers and owners on fit-outs, tenant improvements, remodels and multi-unit installations, as well as on the day-to-day service that keeps an existing building running.
On new work that means meeting code and holding a schedule that other trades depend on. Backflow prevention in particular is not optional and not something to discover at inspection — it protects the public supply, and it has to be certified.
You call, we answer
You reach a real person, day or night. A fault that stops trading is dispatched as an emergency, not booked for next week.
Trading first
We get you operating again first — flow restored, line cleared, leak isolated — before we talk about the permanent fix.
Then the proper repair
The permanent repair is scoped and scheduled around your operating hours where possible.
Certified and scheduled
Backflow certified, permits pulled, and the plant put on a schedule so the same failure does not come back.
Why Mallick
Maryland Has Trusted Mallick For 30+ Years
WSSC-licensed and insured crews, and warranties in writing: one year on installations, 30 days on repairs. The same standard whether it is a commercial call at 2pm or a burst line at 2am.
Google reviews
2,979
4.9 average across Gaithersburg, Frederick and Woodbine
Customer Field Notes
What Customers Remember After The Call
4.9
2,979 Google reviews across three Maryland locations
Field note 01 · Gaithersburg, MD
“Eric and Nick did a wonderful job.”
Very thorough and provided detailed explanation of what was needed to get our garbage disposal up and running.
Abbas and Koli were great technicians.
Quickly diagnosed the issue, thoroughly explained everything, and gave me a few options to move forward. I've had great experiences working with Mallick, highly recommend.
Chrissie Schenkel · Gaithersburg, MD Abbas came to our house for an emergency repair on a Saturday.
He was courteous and kind, he didn’t rush, and he worked hard to fix our problem and thoroughly investigate. It was hard to find a plumber who could do this on a Saturday at the last minute, and we appreciated Mallick’s and Abbas’s willingness.
Raj Nayak · Gaithersburg, MD Abbas Rahimiari was exceptionally professional, looking at our two plumbing problems, describing the underlying issues, fixing one immediately and explaining options on the other. Courteous, clear and efficient. And knowledgeable.
Gordon Schatz · Gaithersburg, MD I had a wonderful experience with Billy.
He was amazing and he was able to fix my issue with no concerns! 10/10! Thank you Billy.
Mia Barker · Gaithersburg, MD Excellent service and support from William Clem and Malick Plumbing.
Had a pinhole leak in a water service line. Found and fixed the problem … thanks so much.
Daryle Seckar · Gaithersburg, MD Roberto and Adelson were great to work with, efficient, and answered all questions. Top service and repair of water heater!
Jonathan Daly · Gaithersburg, MD
Fred and Luka were great!
They took the time to find the issue as well as helping me get opinions on future concerns as a new homeowner! Real experts and will work with them again!
Elijah Wadsworth · Woodbine, MD Abbas and Koli were fantastic.
They quickly identified and resolved our issue, and did a check to ensure there were no other sleeping issues. They were a pleasure to work with, respectful, and kind.
Kelley Barnaby · Gaithersburg, MD I received great service from both Ikem and CJ today.
They quickly identified the leak and fixed the issue. They also did a great job replacing some valves that needed replacing. They were very experienced and efficient. I have used Mallick several times and have always been pleased with their service.
Melissa Cavuto · Gaithersburg, MD Abbas and Erick were professional, knowledgeable and kind.
They inspected and guided me to make safe choices with my range that had a gas leak.
Andrea Huerta · Gaithersburg, MD Abbas and Bryan installed my new water heater.
There was a leak in my furnace and they fixed it also! The job was perfect. They had to install vents that were well done. They left no trace and the house was completely clean. The new water heater works like a charm. HIGHLY RECOMMEND this team and Mallick.
Janet · Gaithersburg, MD Kyle was so helpful in helping my husband and I fix the water pressure in our house. Kyle was very well versed and experienced, providing great options for future improvements to water filtering. I would highly recommend his services to anybody struggling with plumbing issues.
Azusena Herrera Tapia · Gaithersburg, MD
Every quote above comes directly from Mallick’s current Google Business Profile record.
Read more customer storiesCommon Questions
Commercial Questions, Answered
Still Stuck?
Talk To A Plumber
(301) 804-6759Someone picks up 24/7 — nights, weekends, and holidays included.
What commercial plumbing services does Mallick offer?
Drain and sewer repair, hydro jetting, commercial water heater installation, pipe replacement, leak detection, grease traps, backflow prevention, storm drainage and scheduled maintenance — for restaurants, retail, offices, multi-unit residential and industrial sites. Routine service through to full system repair.
Do you offer emergency commercial plumbing?
Yes, 24/7. A commercial plumbing failure stops trading, so it is dispatched as an emergency rather than booked in. We restore flow, clear the line or isolate the leak first and complete the permanent repair after you are running again.
Do you offer commercial maintenance plans?
Yes. Scheduled inspection and service on the plant that shuts a building down when it fails — grease traps, backflow devices, pumps and water heaters. Most of the emergency calls we attend on commercial sites were visible on an inspection months earlier.
Why does my building need backflow prevention?
Backflow prevention stops contaminated water being drawn back into the public supply, and on commercial premises it is a legal requirement rather than an upgrade. Devices have to be tested and certified, and a failed or missing device is the kind of thing that surfaces at inspection at the worst possible moment.
Where We Work
Commercial Service Across Maryland
Bethesda Rockville Silver Spring Germantown Potomac Olney Clarksburg Damascus Chevy Chase North Potomac Frederick Woodbine Columbia Ellicott City Aspen Hill Boyds Burtonsville Darnestown North Bethesda Poolesville Takoma Park Wheaton–Glenmont White Oak Green Valley Linganore Washington, DC College Park
Related Services
Plumbing Repair, replacement and installation across every plumbing system in the house — WSSC-licensed plumbers, warranties in writing, and 24/7 emergency service throughout Montgomery, Carroll, Howard and Frederick Counties and parts of NW Washington DC.
Drain & Sewer Drain cleaning, sewer line repair, hydro jetting, video inspection and trenchless replacement across Gaithersburg, Rockville and the surrounding Maryland area — diagnosed with a camera before anyone digs.
Water Heaters Repair, replacement and installation for tank, tankless and hybrid water heaters, with WSSC-licensed technicians and 24/7 emergency service across Montgomery, Carroll, Howard and Frederick Counties and parts of NW Washington DC.