Explained Before We Start
Repair and replacement options explained before work begins.
Plumbing Repair & Installation In Frederick, MD
Full-service plumbing for Frederick homes — from older houses downtown to newer construction out toward Green Valley and Linganore — with licensed plumbers, warranties in writing and a 24/7 emergency line.
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
Plumbing Service in Frederick
Plumbing built for how Frederick County was built
Frederick County did not get built all at once. There are houses here with original cast iron drain lines, houses on galvanised supply, houses re-piped in copper in the eighties and new construction plumbed in PEX — often on the same street. A plumber who only knows one of those is guessing on the other three.
Mallick has grown alongside the county for over thirty years, which is the only real way to learn a housing stock. Our licensed plumbers work on every era of system here, from a single failed shutoff to a whole-house repipe.
Schedule Plumbing Service
Tell us what you need — we’ll be in touch fast.
Every Era Of System
Thirty years on Frederick County housing stock, from cast iron to PEX. We have seen your system before.
Warrantied In Writing
One year on installations, 30 days on repairs, in writing, backed by the crew that did the work.
Water where it should not be? We answer, day or night.
Call (301) 804-6759Go Deeper
Every Kind Of Plumbing
Most plumbing failures announce themselves before they become emergencies. Pressure that drops off over months, a drain that has needed plunging more often lately, a water heater that takes longer than it used to, a stain on a ceiling that has not grown in a week. Those are all repairs. Left alone, some of them become replacements.
An annual check can catch a corroded shutoff, a failing supply line behind the washing machine, or water pressure high enough to shorten the life of fixtures.
Emergency Plumbing in Frederick
Burst pipes, active leaks and no-water calls, answered 24/7.
Leak Detection in Frederick
Finding the leak before it finds your drywall — without opening walls.
Piping in Frederick
Repipes, repairs and material upgrades on every era of Maryland pipe.
Water Lines in Frederick
The line from the meter to the house — repair and replacement.
Sump Pumps in Frederick
Keeping the basement dry, and testing the pump before storm season.
Gas Lines in Frederick
Gas line installation and repair by a licensed gasfitter.
Bathroom Plumbing in Frederick
Sinks, tubs, toilets and the fixtures attached to them.
Kitchen Plumbing in Frederick
Disposals, supply lines and the plumbing behind the cabinets.
Backflow Prevention in Frederick
Protecting the drinking supply from backflow, and certifying it.
Pressure Reducing Valve in Frederick
Pressure too high shortens the life of everything downstream.
Well Pumps in Frederick
Well systems, pressure tanks and the pumps that drive them.
Softener in Frederick
Water softener installation and service matched to your water.
Water Heater in Frederick
Standard, Tankless and Hybrid
Heating in Frederick
Boilers, radiators and the hydronic side of the house.
How the call runs
How a plumbing call actually runs
That matters most on the jobs homeowners are tempted to take on themselves. We pull the permit and arrange the inspection as part of the work rather than leaving it for you to chase afterwards.
You call, we answer
You reach a real person, day or night. We ask enough to know whether this is an emergency dispatch or a booked visit, and we say which it is.
A licensed plumber diagnoses it
A licensed plumber diagnoses the actual fault on site rather than relying on a description over the phone.
Explained before work starts
We explain the options before work begins, including when a repair is appropriate instead of replacement.
Warrantied, permitted, closed out
One year on installations, 30 days on repairs, in writing — and any permit and inspection pulled as part of the job.
Worth Knowing
Plumbing in Frederick County, specifically
Frederick's housing stock runs the full range — houses downtown that have been replumbed once or twice over their lifetime, mid-century neighborhoods with the supply materials of their era, and newer construction out toward Green Valley and Linganore. The failures look different in each, and so does the right fix; a crew that works all three doesn't treat every house like the same job.
The other Frederick difference is water source. Inside town limits you're on municipal supply; outside it, many homes run on private wells — which changes pressure behavior, adds a pump and a tank to the system, and puts water chemistry into play. Mallick has run calls across Frederick County for years, dispatched around the clock from the Gaithersburg shop.
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 plumbing call at 2pm or a burst line at 2am.
Google reviews
2,979
4.9 average across Gaithersburg, Frederick and Woodbine
Code & Permits
Permits in Frederick work differently
Frederick sits outside the WSSC service area, so the permit process that covers Mallick's Montgomery County work does not transfer here. In the county, plumbing permits are issued and inspected by Frederick County Permits and Inspections; inside the City of Frederick, the city runs its own permit office.
Whether a job needs a permit comes down to scope — like-for-like fixture repairs generally don't, work that alters supply, drainage or gas generally does. We tell you which before work starts, and when one is required we handle it as part of the job.
Maryland plumbing licenses are issued at the state level, so the same license that covers our work further south covers Frederick County.
Permit and inspection requirements per Frederick County Permits and Inspections. Requirements change — confirm current rules before work.
Ways To Save
Current Offers On This Job
$75
Off
Sump Pump 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. Valid Jan 1 – Dec 31, 2026.
$41
Off
Sump Pump Maintenance / Installation
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.
$36
Off
New Toilet Installation
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
Plumbing Questions, Answered
Still Stuck?
Talk To A Plumber
(301) 804-6759Someone picks up 24/7 — nights, weekends, and holidays included.
What should I do if I have a burst pipe?
Turn off the main water supply first — every minute it runs is more damage. If water is anywhere near outlets or wiring, shut the electricity off at the panel too. Then call a licensed plumber. Do not wait for business hours; we run 24/7 emergency service across Frederick and surrounding Frederick County communities.
Why is my water pressure suddenly low?
Usually mineral buildup, a leak somewhere in the line, corroded pipe narrowing from the inside, or a failing pressure reducing valve. Occasionally it is the municipal supply and nothing to do with your house at all. The diagnosis matters, because three of those are repairs and one of them is not your problem to fix.
How can I prevent clogged drains?
Keep grease, coffee grounds and food scraps out of the kitchen drain and hair out of the shower drain — those three account for most of what we pull out. Drain screens help catch debris before it enters the pipe. If a drain has needed clearing more than once in a year, something structural is going on and it is worth a camera inspection rather than another plunger.
Is Mallick licensed and insured?
Yes. Installations carry a one-year warranty and repairs carry 30 days, in writing, backed by the same crew that did the work. We are licensed and insured, and hold Maryland Master Plumber License #19572.
Do you serve all of Frederick County, or just the city?
All of it. Mallick has run calls across Frederick County for years — the city, Green Valley, Linganore and the rural stretches between — with crews dispatched around the clock from the Gaithersburg shop.
Who issues plumbing permits in Frederick?
Outside city limits, Frederick County Permits and Inspections issues the permit and sends the inspector. Inside the City of Frederick, the city runs its own permit process. Either way, when a job needs one we handle it as part of the work.
My home is on a well. Does that change the work?
It changes the system, not the standard. A well adds a pump, a pressure tank and its own water chemistry to the picture, and our plumbers work on all of it — including the treatment equipment wells often need.
Where We Work
Plumbing 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
Water Heaters Repair, replacement and installation for tank, tankless and hybrid water heaters — licensed technicians, upfront answers, and 24/7 emergency dispatch to Frederick and every corner of Frederick County.
Drain & Sewer Drain cleaning, sewer repair and camera inspection across Frederick and Frederick County — on town sewer or septic — with licensed crews and 24/7 emergency dispatch.
Water Quality Softeners, filtration and whole-house treatment for Frederick County water — municipal or private well — sized from a real water test, not a brochure.