O'Neill Plumbing Services L.L.C.

What They Do

Water DamageMoldMold TestingSewage

• Drain cleaning
• Faucet installation
• Faucet repair
• Garbage disposal installation
• Garbage disposal repair
• Plumbing leak detection
• Plumbing leak repair
• Plumbing pipe repair
• Sewer cleaning
• Sewer repair
• Shower repair
• Sump pump installation
• Sump pump repair
• Toilet installation
• Toilet repair
• Water heater installation
• Water heater repair
• Water tank installation
• Water tank repair
• 24/7 Emergency
• Cleaning Up
• Dependable Service
• Emergency Drain Cleaning
• Emergency Plumbing Drain
• Emergency Service Available 24/7
• Excavating Services
• Faucet Repairs/Replacements
• Free Estimate

In Their Own Words

Operating 7 days a week, 24 hours a day, for all your residential plumbing needs, from toilets to garbage disposal, sink clogs, hair clogs, sewer clogs, water heater repair and replacement, drain replacement, water line repair and replacement, leak detection, emergency service O'Neill Plumbing Services L.L.C., located in Alexandria, VA, is a premier provider of expert plumbing solutions. Specializing in plumbing emergencies, we are dedicated to delivering prompt and reliable service to our customers. Our team of certified plumbers excels at addressing critical issues like burst pipes, blocked drains, and water heater failures. Trust us for superior workmanship in resolving the most pressing plumbing challenges in your home or business.

Written by the business on its public profile. We have not verified these claims.

Before You Call O'Neill Plumbing Services L.L.C.

1. Do you take moisture readings every day and will you give me the drying log?
2. Are your technicians certified in water damage restoration?
3. Where do you think the moisture is coming from, and who fixes it?
4. Will you set up containment and negative air, and how will you protect the rest of the home?
5. Do you also do remediation? If so, who checks your work?

Ask for the license that fits where you live, a DC home improvement license, a Maryland Home Improvement Commission license or a Virginia Board for Contractors license, and look it up with that agency. Also ask for proof of insurance and industry certification for the technicians.

How Their Reviews Break Down

Counts from public listings as of September 23, 2026. A handful of reviews says less than a few hundred.

Read This While You Wait

• DIY with careWhat to Do in the First 24 Hours After Water DamageAn hour by hour plan for the first day after water damage. Make it safe, stop the source, document, remove water and start drying before mold can start.
• DIY with careSafe DIY Mold Cleanup for Areas Under 10 Square FeetA step by step method to clean up mold under 10 square feet safely, with the gear to buy, what to throw away, why bleach is not the default, and when to stop.
• Call a proMold Testing, When It Is Worth It and How to Read a Lab ReportWhen a mold test is worth paying for, which kind to ask for, why store kits mislead, and how to read spore counts, outdoor controls and a lab report yourself.
• Call a proSewage Backup Cleanup, What You Can and Cannot DoWhat to do when sewage backs up into your home. How to stay safe, what you can clean yourself, what must be thrown out, and when to call a specialist.