Pinpointed, Not Guessed
Sonic and camera location pinpoints the leak, so one section gets opened rather than several.
Leak Detection & Slab Leak Repair In Gaithersburg, MD
Leak detection and slab leak repair in Gaithersburg and Montgomery County — sonic detection and camera inspection to pinpoint the leak rather than estimate it, plus emergency shut-off valves for the leaks nobody can catch in time.
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
Leak Detection Service in Gaithersburg
Leak detection in Gaithersburg
Hidden leaks can run for months inside walls, beneath floors or under slabs. Worn joints, external damage and ageing pipes are common causes.
Mallick provides leak detection in Gaithersburg and across Montgomery County, finding the leak before the damage finds you.
Schedule Leak Detection Service
Tell us what you need — we’ll be in touch fast.
Slab Work Done Once
Slab leaks located before concrete is broken — the finding decides where, not the guess.
Protected Next Time
Shut-off valves fitted where they are warranted, so the next burst closes itself.
Water bill climbing with nothing running? Found before it is opened up.
Call (301) 804-6759Worth Knowing
Finding it without opening the house up
We locate leaks without opening the house up speculatively. Sonic detectors pick up the sound of escaping water through concrete and masonry, video camera equipment inspects inside the line itself, and between them we can pinpoint a leak rather than estimate it.
Accurate leak detection is especially useful under a slab because it helps limit unnecessary opening of concrete.
Diagnostic sequence
How a leak detection call runs
Some water damage arrives too fast for detection to help — a pipe bursting in a cold snap, or heavy summer rain overwhelming a system. For that, an emergency automatic shut-off valve is worth knowing about: it responds to a sudden drop in pressure and closes the supply before the house fills.
An automatic shutoff can help protect the property when nobody is home.
What you have noticed
We start with the evidence you already have — the bill, the sound, the stain — because it narrows the search before anyone arrives.
Located, not estimated
Sonic detection and camera inspection locate the leak precisely, without opening the house speculatively.
Planned from the findings
The repair plan follows the findings and includes reinstating any slab that must be opened.
Repaired and warrantied
Warrantied in writing, and we will talk you through a shut-off valve if the incident warrants one.
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 leak detection call at 2pm or a burst line at 2am.
Google reviews
2,979
4.9 average across Gaithersburg, Frederick and Woodbine
Ways To Save
Current Offers On This Job
$32
Off
Any Plumbing Service
$1 off for Each Year We’ve Been in Business!
Limit 1 offer per customer, cannot be combined with other offers, residential use only, must be presented at time of service. Not applicable to dispatch charge. Only applies for work performed. Valid Jan 1 – Dec 31, 2026.
Our maintenance plan
The Service Contract Of Choice
A 12-month annual maintenance contract for your home’s plumbing. The team is small enough to give you personalized attention and large enough to handle whatever comes up.
What stands behind every contract
12-month coverage term
24/7 emergency line
Licensed, trained technicians
Payment plans available
2-Year Extended Warranty for Furnished & Installed Equipment
6-Month Repair Warranty
Levels are matched to your home
The office confirms the current contract levels and details before you commit — call and the team will walk you through the options.
12-month term · Sign up by phone
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
Leak Detection Questions, Answered
Still Stuck?
Talk To A Plumber
(301) 804-6759Someone picks up 24/7 — nights, weekends, and holidays included.
What are the signs of a hidden water leak?
An unexplained rise in the water bill, the sound of running water with everything off, damp or a stain that keeps returning, warm patches on a floor, a musty smell, or reduced pressure with no other cause. Any of those justify a call before you go looking behind drywall.
How do you find a slab leak without breaking the floor?
Sonic detection equipment hears water escaping through concrete, and camera inspection shows the inside of the line. Between them we pinpoint the location rather than estimate it — which is the difference between opening one section of slab and opening several.
What is an emergency automatic shut-off valve?
It is a valve that monitors the supply and can close automatically when it detects a leak. It can help protect the home while it is unoccupied.
How do I know if I have a slab leak?
Warm or unusually cool patches on the floor, unexplained damp at the edge of a room, the sound of water under the floor, or a water bill that has climbed with no change in use. Slab leaks hide well, which is why the bill is often the first honest signal.
Where We Work
Leak Detection 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
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