Seen, Not Guessed
Camera first, always — the diagnosis guides the recommendation.
Sewer Line Repair & Replacement In Gaithersburg, MD
Sewer line repair and sewer main replacement in Gaithersburg, across Montgomery County, Maryland and D.C. — inspected on camera first, replaced trenchless where the run allows, and backups answered 24/7.
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
Sewer Line Service in Gaithersburg
Sewer line repair in Gaithersburg
A sewer line is buried, forgotten and doing one of the most important jobs in the house — carrying wastewater away from the property. When it fails, the failure is not merely inconvenient, it is a health hazard, and it usually arrives with no warning at all.
Mallick handles sewer line repair in Gaithersburg, along with sewer main replacement, across Montgomery County, parts of Maryland and D.C. — with the diagnostic and trenchless equipment to do it without excavating the whole run.
Schedule Sewer Line Service
Tell us what you need — we’ll be in touch fast.
Yard Left Intact
Trenchless replacement wherever the line allows, so the lawn and drive stay whole.
Emergency Response
Backups dispatched 24/7, because standing wastewater is a health matter.
Sewer backing up, or drains gurgling? Several drains at once means the main.
Call (301) 804-6759Worth Knowing
The camera goes in before the ground is opened
It is no longer necessary to unearth an entire sewer line to repair or replace it. We inspect the inside of the line on camera first, which establishes where the damage actually is and whether the pipe needs repairing or replacing.
The camera shows whether one section needs repair or whether deterioration extends along the line.
Installation plan
How a sewer line job runs
Where replacement is the answer, trenchless methods put the new pipe in through small holes at each end of the run rather than a trench along it. The lawn, the driveway and the mature planting survive, and the job is finished faster.
Trenchless work is not always possible. Collapsed pipe, certain bends and older materials may require an open cut. We assess the line before recommending a method.
Inspected on camera
Camera inspection first. The location and extent of damage guide the repair.
Planned from the findings
Repair and replacement recommended from the camera findings, with footage available to you.
Trenchless where possible
Trenchless where the run allows it — two small holes rather than a trench through the garden.
Tested and warrantied
Line tested on completion, ground made good, and the work warrantied in writing.
Worth Knowing
Sewer backups are a 24/7 call
Sewer backups do not wait for business hours and should not be left overnight. Wastewater backing into a house is a health matter before it is a plumbing one, and every hour it stands adds to what has to be cleaned and replaced afterwards.
Emergency sewer backups are dispatched 24/7. If more than one drain in the house is backing up at once, the fault is the main line rather than a fixture, and that is the call to make immediately rather than in the morning.
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 sewer line 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
$500
Off
Sewer Line Replacement
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
Sewer Line 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 sewer line problem?
More than one drain backing up at the same time, gurgling from toilets when a sink drains, sewage smells indoors or in the yard, unusually lush or sunken patches of lawn along the line's route, and repeated blockages that clear and return. Several drains at once means the main, not a fixture.
Do you have to dig up my yard to replace a sewer line?
Usually not. We inspect the line on camera first to find exactly where the damage is, then use trenchless methods — two small holes at either end of the problem area rather than a trench along the whole run. Your lawn and landscaping stay intact.
How do you decide between repairing and replacing?
A single failed section may be repairable; a deteriorating line may need replacement. We show you what the camera finds.
Do you handle emergency sewer backups?
Yes, 24 hours a day. A sewer backup is a health hazard as much as a plumbing fault, and the damage keeps increasing for as long as it stands. If several drains are backing up at once, call immediately rather than waiting for morning.
Where We Work
Sewer Line 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
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.
Trenchless Technology Trenchless sewer line repair, replacement and installation across Gaithersburg and Maryland — two small access holes instead of a trench, with the lawn, driveway and landscaping left where they are.
Video Pipe Inspection Video pipe and sewer scope inspection across Gaithersburg and Maryland — a camera in the line instead of an educated guess, for recurring faults, pre-purchase checks and any repair worth getting right first time.
Hydro Jetting Hydro jetting in Gaithersburg and the surrounding areas — high-pressure water that takes grease, scale and roots off the pipe wall instead of boring through them, with a camera inspection first.