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    Average homeowner rating
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    Verified toilet services reviews

Top-Rated Toilet pros in Herndon - Updated Nov 2026

Avatar for Mahon Plumbing
Mahon Plumbing
4.6(
199
)
Drain Clog or Blockage - ClearFaucets, Fixtures and Pipes - Repair or Replace

Serving Herndon, VA and surrounding areas

Approved

In business since 1994

Emergency services offered

Warranties offered

"Recently used Mahon Plumbing for various plumbing needs around my house. As a new homeowner you can be skeptical on what’s behind your walls or in this case pipes. Mahon did an initial sewer line inspection and called them back to swap out toilets and install natural gas in my backyard for a grill and fire table. They were professional, honest, and extremely knowledgeable about all phases of my projects. I would recommend Mahon Plumbing for all of your plumbing needs!"
Tankless water heater installation
Tankless Water Heater Installation
Commercial drain cleaning
Sewer Line Video Inspection
Water heater replacement

+30

Response time7 hrs
Response rate100%
Recommended by92%of homeowners
Avatar for DB's Plumbing & Drain
DB's Plumbing & Drain
4.8(
194
)
Faucets, Fixtures and Pipes - Repair or ReplaceDrain Clog or Blockage - ClearFaucets, Fixtures and Pipes - Repair or Replace - For Business

Serving Herndon, VA and surrounding areas

Approved

In business since 2008

Free estimates

Emergency services offered

"Tommy was professional and knowledgeable. He arrived at both appointments on time and got the valve and water heater replaced quickly. I would highly recommend them. I comparison shopped two other plumbing companies during the day and DB's was the best in knowledge and price."
Sewer replacement Inside and out
Team at our new locations ribbon cutting
Expansion tank with new venting
New pipe continued
Whole house re pipe

+212

Response time12 hrs
Response rate100%
2 neighbors recently requested a quote
Avatar for Prince William Plumbing
Prince William Plumbing
5.0(
33
)
Faucets, Fixtures and Pipes - Repair or ReplaceFaucets, Fixtures and Pipes - Repair or Replace - For Business

Serving Herndon, VA and surrounding areas

Approved

In business since 2005

Free estimates

Emergency services offered

"I live in a 57 year-old house, and it is not easy to find replacement parts.  They analyzed what was needed
and had no problem in repairing each item.  They also noticed that the toilet was not installed correctly, and
brought it to my attention.  What a difference it has made.  Great professional work by Brian and Juan.  I am so
pleased with the work performed and will continue using this company.    
"
Additional Photos
Recommended by96%of homeowners
Avatar for Done Rite Services
Done Rite Services
5.0(
16
)
Drain Clog or Blockage - Clear

Serving Herndon, VA and surrounding areas

Approved

In business since 2021

Free estimates

Emergency services offered

"Excellent experience from the helpful person who answered the phone to the WONDERFUL Plummer Willis who was so knowledgeable and did an excellent job. He suggested an improvement and now we love our new sink. Willis was always on time, kept me updated on his progress before arriving. Now we consider 'Done Rite' the best experience and our personal plumbing service!"
Additional Photos
Additional Photos
Additional Photos
Additional Photos
Additional Photos

+22

Response time1 day
Response rate100%
Recommended by66%of homeowners
Avatar for Sam Home Improvement, Inc.
Sam Home Improvement, Inc.
4.9(
49
)
Faucets, Fixtures and Pipes - Repair or Replace

Serving Herndon, VA and surrounding areas

Approved

In business since 2005

Free estimates

Customers say: Quick response

"Awesome awesome work! I couldn't select it but Sam Home Improvement did an entire bathroom remodel. Sam did a fabulous job. From demolition to tile install to marble bull-nosing and finally free standing tub install.....perfection. We are so happy with our bathroom. It's beautiful! We are so happy and will use Sam Home Improvement again."
Bathroom remodeling
Bathroom remodeling
Bathroom remodeling
Bathroom remodeling
Bathroom remodeling

+51

Response time5 hrs
Response rate93%
2 neighbors recently requested a quote
Avatar for After Hours Home Improvement, LLC
After Hours Home Improvement, LLC
4.3(
241
)
Drain Clog or Blockage - ClearFaucets, Fixtures and Pipes - Repair or ReplaceFaucets, Fixtures and Pipes - Repair or Replace - For Business

Serving Herndon, VA and surrounding areas

Approved

In business since 2002

Free estimates

Emergency services offered

"My leaky toilet turned into a rotted sub-floor. The crew Reid sent over to replace the sub-floor/install a new one / install new tile was impeccable. Very professional and courteous. I would certainly hire them for other house projects or emergency jobs. Definitely the best in the area! Highly recommend."
shower remodel
bathtub remodel
WATER MAIN RE-PIPE
BEFORE
DEMO BATHROOM

+211

Response time7 hrs
Recommended by74%of homeowners
Avatar for Ninja Plumbing LLC
Ninja Plumbing LLC
4.7(
19
)
Drain Clog or Blockage - Clear

Serving Herndon, VA and surrounding areas

Approved

In business since 2024

Emergency services offered

"Charles heads up Ninja Plumbing and quickly answered the call for a clogged kitchen double sink. The root cause was accurately triaged to a backup on the main drain pipe where the two PVC drain pipes connected. With a declogging auger machine, Charles was able to unclog the main drain pipe drain running the full 50ft auger metal line and test the water successfully draining from half full sink of water all in under 60 minutes. Charles' ongoing interaction & communications during the full session of the fix was fairly reassuring versus other contractors who may mind more onlooking from customers for edification."
Tankless water heater
Tankless water heater
Tankless water heater
Tankless water heater
Tankless water heater

+3

Response time7 hrs
Response rate100%
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Toilets FAQs, answered by experts

Check connections, clean fixtures, and apply finishing or protective coatings to preserve months' worth of shine and functionality.

You can tell if your toilet fill valve is full by removing the lid and taking a look. When you flush the toilet, the float is at the bottom of the tank, the water empties, and the fill valve opens. The float rises to the top as the tank fills again with water. When the float rises to the right level, the fill valve closes; if the valve is too high, your toilet may only partially flush, requiring you to adjust the float. 

If you have to hold the toilet handle (also called the toilet lever) down to flush, you probably have a chain problem. A chain that cannot fully lift the flapper will close too early and not clear the toilet bowl. Try adjusting the chain length so there’s about ½ inch of slack.   

Replacing a toilet typically takes two to four hours. Several factors can impact this timeline, including the condition of the old toilet, flange, flooring, and pipes. If a professional discovers issues like a cracked flange, damaged flooring, leaky pipes, or a broken wax ring, the installation will take longer. Additionally, some toilets, such as wall-mounted or in-wall-tank models, are more complex to install and may require cutting into and repairing drywall, which adds to the project time. Given the weight of toilets and the importance of proper placement, it is often best to hire a professional for the job.

The average cost to replace a toilet fill valve is around $100, and prices range from $50 up to $150, depending on your location, the experience of the plumber, and how accessible your toilet is. In most cases, a professional plumber can replace your fill valve in under an hour, although it might take longer if they also need to fix or replace other components at the same time.

The Herndon, VA homeowners’ guide to toilet services

From average costs to expert advice, get all the answers you need to get your job done.