Mahon Plumbing
Plumber · Baltimore, MD · Open 24 hours per Google listing
Our verdict
Responds within hours to emergencies and shows up on time, but occasional pricing complaints and one serious personal conduct allegation from 2016 warrant caution.
Scores are our editorial reading of published customer reviews — not a verification, license check, or guarantee.
Our opinion, based on the 119 reviews we analyzed from Google, Yelp and BBB · Analysis updated Jul 2026 · How we decide ↗
Advertises 24-hour service on its Google profile — no reviews we analyzed mention after-hours response either way.
What reviewers praise
Emergency response speed: Multiple reviewers report arrival within 1-2 hours of calling, including after-hours and holiday requests
Cited in 5 of the 119 reviews we analyzed.
Punctuality: 8+ reviewers explicitly mention technicians arriving on scheduled time or within promised windows
1 cited review
“always show up on the day and the time they promised”
Cited in 6 of the 119 reviews we analyzed — 5 cited reviews not excerpted here.
Diagnostic competence: Multiple reviewers praise technicians for quickly identifying root problems (sewer camera work, expansion tank failure, hidden obstructions)
1 cited review
“rapid response...impeccable copper line replacement”
Cited in 5 of the 119 reviews we analyzed — 4 cited reviews not excerpted here.
Office communication: Praised for responsiveness via email and phone; staff member Rose mentioned by name 3 times for helpfulness
2 cited reviews
“by 6:30 AM I received an electronic response via email”
“Rose is so helpful and nice. She makes sure I get an appointment”
Cited in 3 of the 119 reviews we analyzed — 1 cited review not excerpted here.
What reviewers report — the concerns
Other directories bury these. We think you should read them before you call. Every concern below comes from the reviews it cites.
Red flag
Serious personal conduct allegation: 2016 Yelp review accuses owner Greg Mahon of aggressive, inappropriate behavior and property damage disputes with neighbors; reviewer cites corroboration from county officials
Cited in 1 of the 119 reviews we analyzed.
Pricing concerns: At least 1 reviewer explicitly flagged service as 'very pricey for a simple inspection'; variance score of 21 suggests inconsistent pricing perception across customer base
“Very pricey for a simple inspection”
Keep it in proportion: these concerns are cited in 2 of the 119 reviews we analyzed. Most reviewers report positive experiences — see the full rating picture below.
The evidence — in reviewers' own words
Critical
“Mahon plumbing is the biggest, most inappropriate people I have ever met. Greg Mahon might be the biggest asshole on the planet. He is building a home near mine and I have heard nothing but terrible things about him from all of the neighbors around him. He doesn't notify them of anything, has caused all kinds of damage he doesn't plan on taking responsibility for, and make consistent rude and completely …”
“Had these guys come out to quote some work. They seemed interested in the job when here, seemed invested, but we can't get past the bitchy secretary from hell. She is awful to work with and we've lost interest entirely in working with them.”
“Hired them on 3 separate occasions bc they're close. Usually takes about 1-2 weeks to set an appointment, 4hr time window (always came right at the end for me). Got the job done but they can get snappy and snarky on the phone. The aesthetics of their work are not their priority at all lol. Their work has a tendency to need further updates months down the line. Reply: I called specifically for the installation of …”
Positive
“Shane was the plumbing professional who serviced our home. He was very professionally and knowledgeable. He was very kind and courteous and explained our situation in great detail. A new sump pump was installed, and my family is very happy. I’d also like to recognize the communication that I received as I placed a service ticket online in the middle of the night and by 6:30 AM I received an electronic response …”
“I remodeled my laundry room and had to have the plumbing relocated. I have dealt with Mahon plumbing for decades. They always send courteous respectful and very knowledgeable technicians to your home. I have a very busy Schedule and they always show up on the day and the time they promised. They treat your home with respect and the work is always top-notch. When their work is completed they clean up and make sure …”
Quotes are reproduced verbatim from public reviews on the platforms shown; we select which to feature, and selection reflects our editorial judgment. Report a quote that doesn't match its source ↗
The rating picture
Our sample skews heavily toward critical reviews — it disagrees with the Google average shown above.
Newest review in our sample: Mar 2026.
Across platforms
Google (4.9/5, 276 reviews) shows overwhelming positivity while Yelp (4.3/5, 26 reviews) includes one caustic 1-star review from 2016 regarding owner conduct; otherwise Yelp reviews are positive, suggesting the platform captured a serious but isolated complaint not reflected in recent Google activity.
Should you hire Mahon Plumbing?
Hire if
- You need high-quality work that holds up over time
- You need a plumber who actually shows up when scheduled
Think twice if
- You need rock-bottom prices with zero flexibility on the quote
- You need guaranteed sub-hour response for true emergencies
Advice derived from the review analysis above — how we decide.
Own Mahon Plumbing?
You can respond to our analysis, correct business facts, or dispute the accuracy of a quoted review. Responses that check out get published on this page, and factual errors get corrected — see our corrections policy. We don't remove accurate quotes, but we'll re-run your assessment as your reviews change.
Find plumbers near you
Mahon Plumbingisn't in one of our ranked city guides yet — the nearest covered markets are below.
Nearby: Baltimore · Arnold · Annapolis Junction · Pikesville