669 plumbers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Catonsville: Len The Plumber Heating & Air, LLC, CR Score 94/100; 4.7★ from 15,911 Google reviews; open 24/7.
Best for emergencies (open 24/7): Roto-Rooter Plumbing & Water Cleanup, posts 24/7 hours; ranked #2 of 669.
Most-reviewed: Horizon Services - Air Conditioning, Heating, Plumbing, & Electrical, 4,514 Google reviews at 4.8★, the most of 669 ranked after Len The Plumber Heating & Air, LLC; ranked #17.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
669 Catonsville plumbers are ranked here by CR Score, from 8 published factors. 194 are open 24/7, 381 open Saturdays and 268 open Sundays, based on posted hours. The median Google rating is 4.8★ across 669 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Len The Plumber Heating & Air, LLC | 94 | 4.7★ (15,911) | Arbutus, 3 mi away | 24/7 | Overall |
| 2 | Roto-Rooter Plumbing & Water Cleanup | 92 | 4.8★ (4,075) | Baltimore, 6 mi away | 24/7 | Emergencies |
| 3 | Catons Plumbing, Drains & Water Cleanup | 91 | 4.7★ (1,684) | Catonsville | 24/7 | — |
| 4 | Roto-Rooter Plumbing & Water Cleanup | 91 | 4.9★ (1,074) | Arbutus, 5 mi away | 24/7 | — |
| 5 | Roto-Rooter Plumbing & Water Cleanup | 91 | 4.8★ (956) | Ellicott City, 4 mi away | 24/7 | — |
| 6 | Roto-Rooter Plumbing & Water Cleanup | 90 | 4.8★ (1,242) | Elkridge, 6 mi away | 24/7 | — |
| 7 | Prime Plumbing | 90 | 4.8★ (2,323) | Glen Burnie, 10 mi away | 24/7 | — |
| 8 | Catons Plumbing, Drains & Water Cleanup | 90 | 4.8★ (565) | Ellicott City, 4 mi away | 24/7 | — |
| 9 | Benjamin Franklin Plumbing of Baltimore | 90 | 4.9★ (326) | Baltimore, 5 mi away | 24/7 | — |
| 10 | Sewer Slayer | 89 | 5.0★ (157) | Arbutus, 5 mi away | 24/7 | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Scores below: based on 6 of 8 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.
Ranked #1 because of its Google rating and review volume: 4.7★ from 15,911 Google reviews, the most Google reviews on this list (15,911).
Based in Baltimore, 6 mi away
Ranked #2 because of its Google rating and availability: 4.8★ from 4,075 Google reviews, open 24/7.
Based in Catonsville
Ranked #3 because of its Google rating and availability: 4.7★ from 1,684 Google reviews, open 24/7.
Based in Arbutus, 5 mi away
Ranked #4 because of its Google rating and availability: 4.9★ from 1,074 Google reviews, open 24/7.
Based in Ellicott City, 4 mi away
Ranked #5 because of its Google rating and availability: 4.8★ from 956 Google reviews, open 24/7.
Based in Elkridge, 6 mi away
Ranked #6 because of its Google rating and availability: 4.8★ from 1,242 Google reviews, open 24/7.
Based in Glen Burnie, 10 mi away
Ranked #7 because of its Google rating and availability: 4.8★ from 2,323 Google reviews, open 24/7.
Based in Ellicott City, 4 mi away
Ranked #8 because of its Google rating and availability: 4.8★ from 565 Google reviews, open 24/7.
Based in Baltimore, 5 mi away
Ranked #9 because of its Google rating and availability: 4.9★ from 326 Google reviews, open 24/7.
Based in Arbutus, 5 mi away
Ranked #10 because of its Google rating and availability: 5.0★ from 157 Google reviews, open 24/7.
Based in Baltimore, 7 mi away
Ranked #11 because of its Google rating and availability: 4.9★ from 400 Google reviews, open 24/7.
Based in Catonsville
Ranked #12 because of its Google rating and availability: 5.0★ from 71 Google reviews, open 24/7.
Based in Baltimore, 7 mi away
Ranked #13 because of its Google rating and availability: 4.8★ from 560 Google reviews, open 24/7.
Based in Columbia, 6 mi away
Ranked #14 because of its Google rating and availability: 4.9★ from 257 Google reviews, open 24/7.
Based in Dundalk, 11 mi away
Ranked #15 because of its Google rating and availability: 4.9★ from 614 Google reviews, open 24/7.
Based in Reisterstown, 14 mi away
Ranked #16 because of its Google rating and availability: 4.9★ from 946 Google reviews, open 24/7.
Based in Baltimore, 4 mi away
Ranked #17 because of its Google rating and availability: 4.8★ from 4,514 Google reviews, open 24/7.
Based in Cockeysville, 14 mi away
Ranked #18 because of its Google rating and availability: 4.9★ from 691 Google reviews, open 24/7.
Based in Towson, 11 mi away
Ranked #19 because of its Google rating and availability: 4.8★ from 752 Google reviews, open 24/7.
Based in Eldersburg, 14 mi away
Ranked #20 because of its Google rating and availability: 4.9★ from 542 Google reviews, open 24/7.
Based in Columbia, 9 mi away
Ranked #21 because of its Google rating and availability: 5.0★ from 140 Google reviews, open 24/7.
Based in Beltsville, 20 mi away
Ranked #22 because of its Google rating and availability: 4.9★ from 1,368 Google reviews, open 24/7.
Based in Baltimore, 4 mi away
Ranked #23 because of its Google rating and trade focus: 4.8★ from 1,366 Google reviews, listed on Google as “Plumber”.
Based in Elkridge, 4 mi away
Ranked #24 because of its Google rating and availability: 4.6★ from 426 Google reviews, open 24/7.
Based in Baltimore, 11 mi away
Ranked #25 because of its Google rating and availability: 4.9★ from 268 Google reviews, open 24/7.
#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 669 ranked plumbers here; the rest are on their profiles.
20 more plumbers within 25 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
National price ranges in USD, not adjusted for Catonsville. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Water heater replacement | $882 | $1,348 | $1,826 | Per unit, installed (unit plus labor); typical range of customer-reported jobs. US national range | October 2026 |
In Maryland, Maryland State Board of Plumbing licenses Plumbing work: water supply, drain, waste and vent piping and fixtures.
No chip usually means we have not matched a state record yet. Check the lookup yourself before you hire.
Guide checked October 2026. How we verify licenses
We scored 669 Catonsville plumbers on 8 factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. Unknown factors are left out of the score, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Catonsville data |
|---|---|---|---|
| Reputation | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |