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A Mallick Plumbing and Heating technician arriving at a Maryland home with a tool bag

Gaithersburg · Serving Maryland 30+ Years

Montgomery County’s
Trusted Plumbing Advisor
For 30+ Years

WSSC-licensed and insured technicians, upfront pricing with financing, and warranties in writing for Plumbing Repairs, Drains, Water Quality, and 24/7 Emergencies for Montgomery, Carroll, Howard and Frederick Counties and parts of NW Washington DC.

30+ Years
24/7 Service
WSSC Licensed
Pricing & Financing

Your Local Gaithersburg Plumbing Contractor

Our Family, Serving Yours For 30+ Years

Plumbing problems don’t keep business hours. Mallick Plumbing & Heating has been the reliable choice across Gaithersburg and Montgomery County for more than three decades — call (301) 804-6759 and reach a real person, day or night.

We’re small enough to give you personalized attention and large enough to handle whatever your home or business needs.

WSSC licensed & insured Upfront, Honest Pricing w/ Available Financing Same-Day Availability 24/7 emergency service
The full Mallick Plumbing & Heating team with service trucks
The Mallick Plumbing & Heating team, serving your home and business.

Schedule Service

Tell us what you need — we’ll be in touch fast.

This form is for routine appointments. For a plumbing emergency, call (301) 804-6759. Emergency service is available 24/7.

By submitting, you agree to be contacted by Mallick Plumbing & Heating by phone, text, or email about your request.

Get To Know Mallick

What Service Should Feel Like

Meet the people behind the work and see the care we bring to your home or business.

Watch our story on YouTube

Clear Communication

We explain the diagnosis and service options before work begins.

Live Assistance

Someone answers around the clock — nights, weekends, and holidays included.

Warrantied Work

One year on installations, 30 days on repairs. Backed in writing, every job.

Maryland’s Choice For 30+ Years

Don’t Wait On A Leak —
Get It Looked At Today.

Same-day availability throughout Montgomery, Carroll, Howard and Frederick Counties and parts of NW Washington DC. Call for 24/7 emergency service.

We Give You The Service You Need

Whatever the house throws at you, one WSSC-licensed team handles it — with HD sewer cameras, sonic leak detection, hydro-jetting, and trenchless repair when the job calls for it.

Additional Services We Offer
  • Leak Detection
  • Hydro-Jetting
  • Trenchless Repair
  • Repiping
  • Sump Pumps
  • Commercial Plumbing

Why Gaithersburg Calls Mallick

Three Decades Of Maryland Plumbing

Mallick Plumbing & Heating has been the plumber Montgomery County homeowners call for over thirty years. What started as a small Gaithersburg shop now serves homes and businesses across the region, with a person answering the phone at any hour.

30+
Years in Maryland
24/7
Emergency service
19572
MD license no.

Licensed Technicians, Not Subcontractors

Every technician is WSSC-licensed, certified by the Washington Suburban Sanitary Commission that runs water and sewer service across Montgomery and Prince George's County. We're members of the Plumbing-Heating-Cooling Contractors Association (PHCC), Quality Service Contractors (QSC), and Water Quality Association, and we're Rinnai ACE Pros. The person at your door works for us.

Explained Before We Start, Warrantied After

We explain your options before any work begins. Installations carry a one-year warranty and repairs carry thirty days, in writing. Financing and payment plans are there for when a water heater fails at the worst possible moment.

Residential And Commercial, One Call

Mallick Plumbing & Heating handles residential and commercial plumbing. From repairs and drains to water heaters and water quality, our team helps homeowners, businesses and property managers keep their plumbing working.

Respect for Your Home and Business

We use boot covers, drop cloths and protective measures to care for your home or business while we work. Our team treats your space with respect and cleans up the work area before leaving.

Equipment, Not Guesswork

Old-Fashioned Hard Work,
Modern Tools

  • HD Sewer Cameras

    See inside the line before anyone digs, so the diagnosis isn't a guess.

  • Sonic Leak Detection

    Finds water behind a wall without opening the wall to look for it.

  • Hydro-Jetting

    Scours the drain properly instead of punching a hole through the clog.

  • Trenchless Repair

    Repairs a sewer line without excavating the front yard to reach it.

Work We’ve Actually Done

Recent Jobs Around Maryland

Gas line run to a built-in outdoor kitchen with a stainless grill and side burner on a stone patio
Gas Line Installation in Columbia, Maryland
Rinnai commercial tankless water heater with PVC venting mounted on a wall in a Gaithersburg restaurant
Commercial Tankless Install in Gaithersburg, Maryland
High-efficiency gas water heater installed in a basement beside a water softener and furnace
Water Heater Replacement in Gaithersburg, Maryland
Interior of a newly installed commercial pump control panel with breakers and variable-frequency drives
Commercial Booster Pump Replacement in Frederick, Maryland
LG hybrid water heater installed by Mallick Plumbing & Heating
LG Hybrid Water Heater Installation
Mallick technician replacing a well pump outside a Maryland home
Well Pump Replacement
Grinder pump replacement completed by Mallick Plumbing & Heating
Grinder Pump Replacement
Under-sink reverse osmosis system installed by Mallick Plumbing & Heating
Reverse Osmosis Installation

Commercial Booster Replacement

Mallick Plumbing & Heating replaced a Frederick, Maryland facility's failing 25+ year old booster pump system with new pumps, connections, and controls, restoring consistent water pressure and long-term reliability.

Aging blue packaged water booster system with original pumps and control cabinet before replacement Before
Replacement booster system with new control panel, valves and copper piping after installation After

In Their Words

Trust Our Team To Work

4.9 from 2,979
Google reviews

  • 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.

    Louise Wilson

    Google review · Gaithersburg, MD · August 12, 2026

  • 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

    Google review · Gaithersburg, MD · August 12, 2026

  • 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

    Google review · Woodbine, MD · August 11, 2026

  • 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

    Google review · Gaithersburg, MD · August 8, 2026

  • 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

    Google review · Gaithersburg, MD · August 5, 2026

  • 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

    Google review · Gaithersburg, MD · August 3, 2026

  • 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

    Google review · Gaithersburg, MD · August 3, 2026

  • 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

    Google review · Gaithersburg, MD · July 31, 2026

  • 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

    Google review · Gaithersburg, MD · July 30, 2026

  • 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

    Google review · Gaithersburg, MD · July 30, 2026

  • 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

    Google review · Gaithersburg, MD · July 28, 2026

  • Roberto and Adelson were great to work with, efficient, and answered all questions. Top service and repair of water heater!

    Jonathan Daly

    Google review · Gaithersburg, MD · July 28, 2026

  • 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

    Google review · Gaithersburg, MD · July 27, 2026

  • Luis and Luca thank you both so much for all of your hard work and awesome professionalism! Look forward to working with you both again.

    R

    Google review · Frederick, MD · July 24, 2026

  • Andrew did a fine professional job!

    We are very please with the installation of our new water heater. It was made easy and painless.

    Albert Z. A.

    Google review · Gaithersburg, MD · July 24, 2026

  • Abbas and collie were friendly professional and kept me informed throughout their work. They also did a great job cleaning up after themselves

    jeff rosenbaum

    Google review · Gaithersburg, MD · July 24, 2026

  • Oscar was the tech who replaced my faucet and replaced a pipe.

    I am extremely happy with the Marrick Co. starting with the office who responded quickly to my texts and phone call.

    B K

    Google review · Gaithersburg, MD · July 23, 2026

  • Abbas and Ikem were here to help my swimming pool gas heater and did a great job. Very professional and prompt. I highly recommend them.

    Mir K. Ali

    Google review · Gaithersburg, MD · July 22, 2026

  • Mallick Plumbing always serves us well.

    Eric B has saved us in two emergency situations (one on Christmas Eve, and one on a weekend) and is always knowledgeable, helpful, and thorough. We appreciate the help!

    Liza Maciorowski

    Google review · Frederick, MD · July 17, 2026

  • Abbas & Kollie are the best.

    They are very nice, respectful and know their job/work really well. Abbas made sure that the problem.is fixed! They have a very good interaction with us.

    Ron Cajigal

    Google review · Gaithersburg, MD · July 16, 2026

  • Andrew Johnston was fantastic.

    He was fixed both issues - guest bathroom water pressure and leaky washer hose valve, even taking time to explain things as he checked it out. He was timely, efficient and pleasant. I highly recommend Mallick plumbing and if you're lucky enough to get Andrew he is committed to fixing the issue.

    Melissa London

    Google review · Gaithersburg, MD · July 15, 2026

Common Questions

Plumbing Questions, Answered

The things Gaithersburg homeowners ask us most — the shut-off valve one is worth reading before you need it.

Still Stuck?

Talk To A Plumber

(301) 804-6759

Someone picks up 24/7 — nights, weekends, and holidays included.

Where is my main water shut-off valve?

In a plumbing emergency, shut the water off first, then call us. The main valve is generally located where the water supply enters your home. Check that yours turns smoothly and shuts the water off completely — valves fail over time from age and calcium buildup, and you don't want to discover that mid-emergency.

How do I choose the right water heater?

Your whole household depends on it, so sizing matters. Common warning signs that yours is failing include rusty-looking water, bad smells, dingy laundry, leaking, and strange noises. We repair and replace both tank and tankless units and will size the right model for your home.

What can I do to maintain my plumbing system?

A well-maintained system is far less likely to surprise you with an unexpected failure. Alongside regular professional maintenance, inspect your plumbing regularly — spotting a problem early helps prevent further damage.

How can I conserve water?

Install water-conserving fixtures and appliances, have maintenance performed to catch hidden leaks, and lower the water level in your toilet tank. More than a third of the water used in the average home goes through toilets, so that last one adds up with every flush.

Do you offer emergency plumbing service?

Yes — 24/7, throughout Montgomery, Carroll, Howard and Frederick Counties and parts of NW Washington DC, including nights, weekends, and holidays. Call (301) 804-6759 and you'll reach a real person.

What warranty do you offer?

One year on installations and 30 days on repairs, in writing. We're WSSC-licensed and carry insurance, and we're members of PHCC and QSC.

Where We Work

Serving Maryland And Northwest DC

Montgomery, Carroll, Howard and Frederick Counties and parts of NW Washington DC. Tap a city on the map for local plumbing, drain and water heater service.

Our locations City we serve Full county coverage Partial coverage: southern Carroll, NW DC & Prince George’s Partial-area shading is approximate. Call to confirm service for your address. Map data © OpenStreetMap contributors

Your Local Mallick Team

Gaithersburg

7620 Rickenbacker Dr Suite L
Gaithersburg, MD 20879
Get directions

Frederick

5735 Industrial Lane Suite 201
Frederick, MD 21704
Get directions

Woodbine

7797 Woodbine Rd.
Woodbine, MD 21797
Get directions

Not sure whether you’re inside the lines? Call (301) 804-6759 — we answer 24/7 and will tell you straight away.

Our Associations & Recognition

BBB Accredited Business, A+ rating
Quality Service Contractors and Plumbing-Heating-Cooling Contractors
Water Quality Association member
Best of Gaithersburg Plumbers, 2020 through 2025
Rinnai ACE PRO Advanced Comfort Expert
TOTO Factory-Trained Plumbing Company
Best of Bethesda
MCSBA
Angi Super Service Award 2023
Angi Super Service Award 2022
Expertise.com Best Plumbers in Bethesda 2021

Members of the Plumbing-Heating-Cooling Contractors Association (PHCC), Quality Service Contractors (QSC) and Water Quality Association. Rinnai ACE Pros and a TOTO factory-trained plumbing company.

30+ Years

Serving Maryland

WSSC Licensed

Washington Suburban Sanitary Commission

Locally Owned and Operated

Gaithersburg and Woodbine, Maryland