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O'Neill Plumbing Services L.L.C.

Alexandria Plumbers
Ranked #10 in Alexandria | Grade C+
4.70 (261 reviews)

O'Neill Plumbing Services L.L.C.

Local plumbing service for Alexandria homes and small businesses. Known for practical troubleshooting, clear communication, and steady workmanship on common plumbing problems.

Why Homeowners Choose This Business

Local, responsive service with straight answers and practical fixes. Clear explanations of what needs to be done and why, with attention to preventing future problems. A dependable option for common plumbing needs in homes and small businesses.

Service Area

Alexandria and nearby Northern Virginia communities.

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Listing details

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  • Published local profile

How This Business Compares

A quick local comparison based on review strength, business detail, and local service fit.
  • Shows strong customer satisfaction signals based on review quality and volume.

Trust Signals

Emergency Service - Phone support available for urgent shutoff and leak guidance; service scheduling based on availability.

Services Covered

  Plumbing Services
  Renovation Services
  Drain Cleaning
  Leak Detection
  Toilet Repair
  Water Heater Services
  Emergency Plumbing
  Water Heater Replacement
  Leak Repair
  Faucet Installation
  Sewer Services
  Pipe Repair
  Installations
  Shutoff Valve Service
  Garbage Disposal Repair
  Repairs
  Sump Pump Check
  Bathroom Plumbing
  Kitchen Plumbing
  Residential Plumbing

Leak detection and repair, toilet repair and replacement, faucet and sink service, water heater repair and installation, garbage disposal service, basic drain cleaning, and troubleshooting shutoff valves and supply lines.


Reviews

Recent Reviews

4.70

(Based on 261 reviews)

Reviews frequently mention patient guidance over the phone during leaks or shutoff issues, which helps limit damage before a visit. Customers highlight clear explanations, dependable workmanship on water heaters, toilets, and leaks, and consistent follow-through. Many note returning to the company for repeat projects over the years. Pricing and scope are generally described as straightforward and fair.

Shannon has been my plumber for ages now. First time I needed a plumber, I was worried about a leak based on my water bill. He poked around, showed me what to look for, then didn’t charge me anything. Ever since then, he has been my guy. Replaced all my toilets, sinks, new hot water heater. Had a failed element in the middle of snowmagedon, he walked me through the process of how I could isolate it and keep water flowing over the phone until he could visit the next day. He will always be my plumber, and I would recommend him to everyone.

Google Review
Mirvat Talaat-Bryan on O'Neill Plumbing Services L.L.C.

I called Mr. O'Neil this morning Dec 28th with a request for a fix on leaking toilet. He was ABSOLUTELY THE BEST CALL I've made this year! Not only did he help guide me in the right direction to fix the problem....he was gracious and thoughtful enough to take call after call walking me thru every step of the way. Wow...just WOW!!!! The luckiest Ive ever made was to the this plumbing service...when others would have charged me an arm and a leg for a dignosis...Mr. O'Neil didn't....for that he will have my business from now on!!! Many many thanks!!! Can't gush enough!!!

I called O’Neill freaking out about a leak in my house and I couldn’t find the shut off valve. While I didn’t need his services at our home, because we found the valve he was so calm and helped me over the phone! He was so kind and reassuring and if I ever need help I will certainly give them a call. Highly recommend.

O'Neill is the only plumber I use, and I recommend Shannon to everyone that asks. He's done all my work since moving to Northern Virginia and it's always been spot on. He's willing to explain what he is doing, why, AND, teach you how to work, adjust, or prevent future issues.

Work is always careful, spot on. He's fixed leaks in our plumbing, installed toilets, and most recently put in an upgraded our hot water heater. Always know when I get work done with Shannon that it'll be right and it'll last.

Extremely impressed by Shannon at O'Neil Plumbing. We were in the middle of a kitchen renovation when we realized one evening we didn't have hot water. We called and Shannon walked us through finding the hot water shut off valve we didn't even know existed and turning it back on. We then noticed our current water heater was leaking internally and immediately Shannon loaded up his truck with a new one and was at our home within an hour. He worked with our home warranty company and was very knowledgeable and professional. The whole team from the call, scheduling, and installation was amazing. Would recommend his services.

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Special Offers

Emergency Service

Emergency service may be available for urgent issues.


Frequently Asked Questions

Common calls include leaking supply lines and shutoff valves, running or leaking toilets, water heater problems, and clogged drains. Fixture replacements and troubleshooting low water pressure also come up frequently. We can assess the issue and discuss practical options. If specialized work is needed, we’ll let you know upfront.

If you’re dealing with an active leak, call and we can usually walk you through finding and operating the correct shutoff valve. Over-the-phone guidance can help limit damage before a service visit. We’ll also advise on what to look for to prevent repeat issues.

Yes, we service traditional tank water heaters and handle replacements when repair is not practical. We’ll check the unit, explain the findings, and outline costs and timelines. If replacement is needed, we can discuss capacity and code considerations.

If there’s an active leak, shut off the nearest valve or the main supply if needed, and clear the work area. For drain issues, avoid using chemical cleaners that can complicate service. Having model numbers or photos of fixtures and the water heater can speed diagnosis.

We discuss the scope after diagnosing the problem and provide clear pricing before proceeding. If there are options, we’ll explain the tradeoffs so you can choose what fits your needs. There are no surprises once the work is agreed.
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Opening Hours


  • Monday Open 24 hours
  • Tuesday Open 24 hours
  • Wednesday Open 24 hours
  • Thursday Open 24 hours
  • Friday Open 24 hours
  • Saturday Open 24 hours
  • Sunday Open 24 hours

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Business Details


Business Rating
4.70 (261 reviews) Pro Listing
Address
5826 La Vista Dr, Alexandria, VA 22310
Phone
Business Type
Plumber

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