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

Avatar for Wallace Plumbing
Wallace Plumbing
5.0(
22
)
Water Main - Install, Replace or Repair

Serving Maryland-line, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Emergency services offered

"Derrick was so helpful! He identified and repaired a leak for us, replacing our water filtration system under the kitchen sink. He was persistent and professional. I would absolutely hire him again."
Additional Photos
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+14

Response time9 hrs
Response rate100%
Recommended by95%of homeowners
Avatar for Mahon Plumbing
Mahon Plumbing
4.6(
199
)
Water Main - Install, Replace or Repair

Serving Maryland-line, 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 Maryland-line, 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
Avatar for BFMD, LLC
BFMD, LLC
4.5(
157
)
Water Main - Install, Replace or Repair

Serving Maryland-line, MD and surrounding areas

Approved

Super Service Award Winner

In business since 2007

Free estimates

Emergency services offered

"Hired BFMD for a water main break. They were quick, clean and somehow replaced 100 feet of degraded water main line without destroying my yard or driveway. They even offered interest free financing for 18 months. Glad this is behind us and yes I would recommend!"
Additional Photos
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+41

Response time1 day
13 neighbors recently requested a quote
Recommended by85%of homeowners
Avatar for Abbott's Plumbing, Inc.
Abbott's Plumbing, Inc.
4.1(
60
)
Water Main - Install, Replace or Repair

Serving Maryland-line, MD and surrounding areas

Approved

In business since 1993

Free estimates

Warranties offered

"Fair, honest, high-quality work, great team working together. Excellent owner that went out of his way to ensure quality work…he personally came on site to quote, had Miss Utility out in a day, began work day after quote, personally conducted post-work evaluation and secured county inspection next day! His quote was half the cost of the second bid and the inside plumbing was completed by master plumber - outstanding quality. Backhoe work exceptional - even cut and replaced sidewalk and driveway eliminating plan to fill in areas with #2 stone that would require a second contractor to repair after new line was installed - required by other contractors. My first use of this firm will not be my last."
Sewer Replacement
Response time2 days
Recommended by90%of homeowners
Avatar for Knock You Plumb Out Plumbing Inc.
Knock You Plumb Out Plumbing Inc.
4.5(
194
)
Water Main - Install, Replace or Repair

Serving Maryland-line, MD and surrounding areas

In business since 2007

Free estimates

Emergency services offered

"John is a good man, with experience to prove it. We have hired him twice now, to sort out a flooded basement (care of the City of Baltimore & their contractor, Spiniello), and then to retrofit all the horizontal pipes in our row home. Not only did he and his team solve our issues, but they made it look good. For a 120 year old row home, you can imagine the plumbing has been subject to a number of revisions, so it was a real pleasure to see them cut it all out (pipes corroded down to a pin hole), and replace every water bearing line with a singular, clear & straightforward system of logically placed cut-off valves, t-joints and what-have-you.
Because we had already had him out to solve a 1400 dollar flood problem the city blamed us for (and which later turned out to be their fault but they are not willing to pay for), he offered us this super low rate to get all the rest* upgraded (*all the main branches had been upgraded already, namely the verticals to the second floor). Johns original quote was for 1250 to do all the horizontals, so since i had him there i asked if he could run gas to our stove. Because of our recent purchases from him and since he was already there, he ran all the gas and got me two (all you need is one) gas cut off valves for an additional 150 bucks. 
Home Depot quoted me 500 for the same job.
John's number resides firmly in my phone.
"
Main sewer connection at the house
Working out of a shoring box
This particular sewer happened to be at 14' in depth.
Sediment Filter
sediment filter

+1

Recommended by95%of homeowners
Avatar for JamesIIMechanical Plumbing, LLC
JamesIIMechanical Plumbing, LLC
5.0(
11
)
Water Main - Install, Replace or Repair

Serving Maryland-line, MD and surrounding areas

In business since 2012

Credit card accepted

"We needed to replace a toilet, James went with us to Home Depot to select one. We now have a water efficient and higher seated toilet, which is great for aging relatives that can’t bend so easily anymore. I would definitely hire/contract him again!"
Recommended by100%of homeowners
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FAQs for water main install, replace or repair projects in Maryland-line, 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 Maryland-line, 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.