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Top-Rated Water main install, replace or repairers in Unionville - Updated Nov 2026

Avatar for Mahon Plumbing
Mahon Plumbing
4.6(
199
)
Water Main - Install, Replace or Repair

Serving Unionville, MD and surrounding areas

Approved

In business since 1994

Emergency services offered

Warranties offered

"It went amazing. Paid the extra bucks for emergency service, because of our smallish waterfall, looking leak, sprouting from a bathroom pipe, enough to puddle water onto our basement/laundry room floor. Initially, spoke to Chris, who was pleasant and upfront with the per hour fees, for emergency services. He sent us Tim, who was hesitant at first, due to the location of the leak, but his experience and knowledge, enabled him to decipher the location of our leak and fix it. A quick trip to Lowes, where he promptly returned and in 90 minutes, the job was done. A week later and the valve is bone dry. Yay!!!"
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 Atlantic Blue Water Services
Atlantic Blue Water Services
4.8(
124
)
Water Main - Install, Replace or Repair

Serving Unionville, MD and surrounding areas

Approved

In business since 1994

Free estimates

Emergency services offered

"On time, in fact earlier than expected. Courteous technicians. Provided options for repair or replacement and was forthcoming about what he saw. Recommended a highly reviewed water heater. All around excellent."
The Fleet
The Building on Rt. 140
Main water line replacement!
Well Pump Replacement
Training Session!

+22

Response time10 hrs
Response rate88%
79 neighbors recently requested a quote
Markool Heating & Cooling, LLC
4.7(
18
)
Water Main - Install, Replace or Repair

Serving Unionville, MD and surrounding areas

Approved

In business since 2019

Free estimates

Credit card accepted

"Professional and efficient. Chris did an A/C repair on a part under warranty from another company. He quickly coordinated getting the new part through the warranty and completed the repair quickly. Will recommend to others."
Response time1 day
15 neighbors recently requested a quote
Recommended by94%of homeowners
American Home Contractors Inc
4.7(
2,134
)
Water Main - Install, Replace or Repair

Serving Unionville, MD and surrounding areas

In business since 1986

Free estimates

Emergency services offered

"American Home Contractors performed roof repairs for me and they were absolutely fantastic!!! We recently moved into our home. At the time of purchase, there were water stains on one of the upstairs bedroom ceilings, however, the home inspector did not note any problems with the roof. After a number of rain storms, it appeared as if the water marks were becoming darker and more prominent. After one particularly bad storm, I used a ladder to touch the ceiling and discovered that it was wet. I called a well known roofing company (not American Home Contractors) to get an estimate on repairs. After that company came out, we were advised that one of the boot seals had degraded and that we needed it replaced. (The agent who came to the house also gave us the hard sell to replace our entire roof.) I was e-mailed the repair estimate which was over $500 to replace a boot seal!! I declined to have that company perform the work on our roof and started looking for another roofing company. Enter American Home Contractors. I received a mailer from American Home Contractors which advertised repairs of boot seals for $149. I called the company to double check that the advertised cost was accurate and I was told that it was. I scheduled an appointment with them and waited to see what would happen. The day before the appointment I was provided an appointment reminder as well as the name of the technician who would be coming to the house. On the date of the appointment, I received a phone call from the tech, Paul Cox, notifying me that he was running ahead of schedule and checking to see if he could arrive at my home a bit early. Wonderful! Paul arrived early and got to work surveying the roof. He did not give me the hard sell to replace my entire roof. He was candid about issues with my roof but did not press me to undertake any additional repairs. He performed the repairs right then and there and even went above and beyond to perform some additional repairs that we did not schedule at no additional cost. Based on my experience with Paul, I felt that Paul was honest, trustworthy, hardworking and dependable. American Home Contractors will definitely be earning my business again. I cannot recommend them enough!!!"
Tesla Solar Roof - Elkridge, MD
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Tesla Solar Roof - Washington, DC
GAF Decotech – Westminster, MD

+509

Recommended by95%of homeowners
Avatar for All Pro Exteriors
All Pro Exteriors
4.6(
62
)
Water Main - Install, Replace or Repair

Serving Unionville, MD and surrounding areas

In business since 1991

Emergency services offered

"Vince called me back within hours of my sending him a message through Angie's List.  Even though he does not list Montgomery County as one of his service areas, he was completely willing to help us out.  In my message, I had requested the work to be done onsite but Vince explained why having him pick up the generator and take it back to his shop to work on it would make more sense.  His charge for pick-up and delivery back to us was only $34.95.
When Vince came to pick up the generator, he was on time and was able to give me a ballpark cost for the work (which turned out to be very accurate).  He said that he could get it back to us in 3-4 days but I asked if he could do it faster as there was a snow storm predicted for the next day or so.  Vince agreed to a shorter time line and ultimately got the generator back to us within 1 day!  There ended up being no snow storm but we got our generator back in working condition - along with a booklet of care instructions, a copy of our invoice, and a service history form.  A few days later we received a hand-written Thank You card in appreciation of our business.  I can't imagine how the service could have been any better.  We will use Vince for any future small engine repairs/maintenance we have and highly recommend him and his services.
"
Recommended by94%of homeowners
Avatar for George's Painting Inc
George's Painting Inc
4.4(
397
)
Water Main - Install, Replace or Repair

Serving Unionville, MD and surrounding areas

In business since 1998

Free estimates

Credit card accepted

"Jorge, Jorge Jr. and their crew are a VERY professional outfit. After taking several estimates from the top-rated Angie's listed contractors in my area, I decided to go with George's Painting based not only on price(his estimate was about the median of all) but based on the very friendly, responsive and knowledgeable Jorge. He came onsite to do the estimate, and made me feel very confident in his crew's ability to do the job.
He impressed me with his knowledge of the process of cleaning and staining fences and decks.  Every question I had for him, he patiently answered. His group also did some minor carpentry work--replacing damaged fence boards and 4x4 deck posts-- Both performed to perfection. Jorge also stood out by mentioning that he preferred to use premium products so the job would last.
His crew was onsite promptly when promised (8:30 meant 8:30, not sometime around 10) Each crew member was courteous and professional. They worked quickly and did an excellent job.
Any time I had to contact Jorge (as we were working on the final scope of work, etc..) he responded in a VERY timely manner.
The end product is the BEST looking back yard in my town-home area.
Thanks to all the guys at George's Painting Inc! We will be calling again when it's time to do more painting.
"
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+22

Recommended by92%of homeowners
Avatar for TriState Home Services
TriState Home Services
4.6(
204
)
Water Main - Install, Replace or Repair

Serving Unionville, MD and surrounding areas

In business since 1949

Free estimates

Emergency services offered

"The gentleman was on time and very professional. He was able to fix the leak in my basement and also fixed the water pressure to my kitchen sink in timely and affordable fashion. Will call again if needed. Thank you again!"
Furnace Tune Up
Floor Heating System
Additional Photos
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+2

Response time1 day
Recommended by91%of homeowners
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FAQs for water main install, replace or repair projects in Unionville, MD

Most standard homeowners' policies don’t cover water main line replacement costs because this project is considered wear and tear, not sudden damage. Check your declarations page for exclusions and talk with your agent about add-on service-line coverage if you want help footing the bill for your water main line replacement costs.

Yes—hire a licensed plumber any time the job taps into a city-owned line or local codes. Professional plumbers carry the right permits, tools, and insurance, and they know how to avoid costly mistakes that could flood your yard or trigger fines. Pros can also provide expert recommendations on the type of system and materials that will work best for your situation, and they can guide you on best practices for ongoing maintenance.

The Unionville, MD homeowners’ guide to water main install, replace or repairs

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