PLUMBING SERVICES | MD, DC & Northern VA

Your Trusted Local Experts for Plumbing Repairs & Installations

Water Treatment | Plumbing | Well Pumps

Why Us?

45+ Years Experience Clean Safe Water Trusted by Homeowners 5-Star Service

A Group Of Water Heaters

Water Heaters

National Water Service is proud to offer expert tankless water heater solutions, including installation, maintenance, and repairs. We provide a variety of water heater options to suit your home’s needs, including electric, propane hybrid, and natural gas models.

Tankless Water Heaters

National Water Services is proud to provide tankless water heater services for water heater installations, operating maintenance, and repairs.

A Man Working On A Tankless Water Heater By National Water Service

Faucet Installations

No more leaky faucets, endless drips, or out-of-style faucets. A new faucet installation from professional plumbers is a fast way to improve your aesthetics and function.

A Sink With A Faucet Running From It

Sump Pumps

Don’t let your sump pump fall into damage or disrepair. A properly functioning sump pump stops flooding of your basement and low lying areas of your homes.

A Water Sump Panel With Radon Blocking Water

Gas Fittings

Professional gas line installations professional plumbers ensure there are no leaks, you have regular pressure regulation, and secure valves for reliable shut-off when needed. Get gas fitting for your barbecues, grills, fireplaces, and other appliances.

A Person Working On A Machine

Water Emergency? No Water?

Leak Detection

Never again worry about your home water system, sudden leaks, keeping up with water filter maintenance, losing water to left-on taps, or experiencing unexpected frozen or burst water pipes.

A Water Sprinkler With A Green Light

Garbage Disposals

New garbage disposal replacements in Maryland can help with clogged drains, foul odors, and constant repairs. Get a powerful and reliable garbage disposal that works effortlessly, leaving your sink and pipes clear and odor-free.

A Man Working On A Sink

Outdoor Kitchens

Maintain and upgrade your outdoor kitchen plumbing today. Get pipe fittings, propane and natural gas, outdoor sinks, outdoor drains, BBQ stations, and more.

A Outdoor Kitchen With A Covered Area
A Man Working In A Kitchen Doing Plumbing Service

Emergency Plumbing

Leaks, clogs, and burst pipes don’t wait. Get emergency plumbing repairs from National Plumbing for water heater malfunctions, pipe leaks, sewer backups, faucet repairs, and much more.

A Group Of Tools On A Blueprint

Trust Our Maryland, DC and Northern Virginia Water Treatment, Well Pump & Plumbing Experts

With over 45+ years of experience in water repair and management, we are proud to offer dedicated Water Techs & Master Plumbers to homes and businesses. Get affordable pricing, competitive quotes, and quality materials that last.

FAQ

Plumbing & Mechanical
What plumbing services do you offer?

We provide a full range of residential and commercial plumbing services throughout Maryland, D.C., and Northern Virginia, including faucet installation, drain cleaning, water heaters (traditional and tankless), gas fittings, leak detection, sump pumps, outdoor kitchen plumbing, garbage disposal installation, emergency plumbing services, and more.

Yes—whether you’re installing new plumbing fixtures or systems (like a tankless water heater or outdoor kitchen plumbing) or need repair work (e.g., leak detection, clogged drains, sump pump issues), our team of master plumbers can manage both.

We serve homes and businesses across Maryland, Washington D.C., and Northern Virginia.

Yes — we are equipped to respond to urgent plumbing issues such as burst pipes, major leaks, sewer backups, and no-water situations. Contact us at the number on the site for prompt assistance.

Regular maintenance is key to avoiding major emergencies. It’s recommended to schedule inspections for things like sump pumps, water heaters, gas lines, and drainage systems at least annually. Preventive maintenance can extend equipment life and reduce unexpected repair costs.

No problem — our technicians will perform diagnostics including leak detection, drain inspections, or system evaluations to determine the root cause, then provide you with clear options and upfront pricing before proceeding.

We strive for transparency — you’ll receive an itemized quote before any work begins, so you understand what is being done, why it’s needed, and what you’ll pay. That way there are no surprises.

Absolutely. Whether it’s a simple faucet replacement, installing a garbage disposal, or a full-scale plumbing installation for a new build or outdoor kitchen, we’ve got the expertise and experience.

Yes — we offer tankless water heater installations, servicing, and maintenance for homes and businesses. These systems provide energy-efficient hot water and we handle them end-to-end.

It’s easy — call our number (301-854-1333), fill out the contact form on our website, or use our online scheduling link. We’ll set up a convenient time to send a technician, evaluate your needs, and provide a quote.