91/100CR Score
Ranked #1 because of its Google rating and availability: 5.0★ from 482 Google reviews, open 24/7.
- 5.0★ from 482 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 17225 Black Rock Rd, Germantown, MD 20874
Best Plumbers in Gaithersburg, MD (2026)
805 plumbers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Gaithersburg: MoCo Plumbing, LLC, CR Score 91/100; 5.0★ from 482 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Roto-Rooter Plumbing & Water Cleanup, posts 24/7 hours; ranked #2 of 805.
- 50
Most-reviewed: Len The Plumber Heating & Air, LLC, 8,136 Google reviews at 4.6★, the most of 805 ranked; ranked #50.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
805 Gaithersburg plumbers are ranked here by CR Score, from 8 published factors. 274 are open 24/7, 502 open Saturdays and 381 open Sundays, based on posted hours. The median Google rating is 4.8★ across 805 rated businesses.
Top 10 plumbers in Gaithersburg at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | MoCo Plumbing, LLC | 91 | 5.0★ (482) | Germantown, 6 mi away | 24/7 | Overall |
| 2 | Roto-Rooter Plumbing & Water Cleanup | 91 | 4.8★ (1,061) | Rockville, 5 mi away | 24/7 | Emergencies |
| 3 | Benjamin Franklin Plumbing of Gaithersburg | 90 | 4.9★ (165) | Gaithersburg | 24/7 | — |
| 4 | Clarksburg Plumbing LLC | 89 | 4.8★ (452) | Clarksburg, 5 mi away | 24/7 | — |
| 5 | Catons Plumbing, Drains & Water Cleanup | 89 | 5.0★ (128) | Germantown, 5 mi away | 24/7 | — |
| 6 | Roto-Rooter Plumbing & Water Cleanup | 89 | 4.8★ (2,719) | Washington, D.C., 16 mi away | 24/7 | — |
| 7 | Michael Bonsby HVAC, Plumbing & Electrical | 89 | 4.8★ (2,083) | Gaithersburg | 24/7 | — |
| 8 | Roto-Rooter Plumbing & Water Cleanup | 89 | 4.8★ (1,211) | Bethesda, 12 mi away | 24/7 | — |
| 9 | BNH Home Services LLC | 89 | 5.0★ (111) | Germantown, 5 mi away | 24/7 | — |
| 10 | The Drain Guys | 89 | 4.7★ (168) | Gaithersburg | 24/7 | — |
The 805 best plumbers in Gaithersburg, ranked
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.
Based in Rockville, 5 mi away
91/100CR ScoreRanked #2 because of its Google rating and availability: 4.8★ from 1,061 Google reviews, open 24/7.
- 4.8★ from 1,061 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 30 Courthouse Sq # 301, Rockville, MD 20850
Based in Gaithersburg
90/100CR ScoreRanked #3 because of its Google rating and availability: 4.9★ from 165 Google reviews, open 24/7.
- 4.9★ from 165 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 9815 Watkins Rd, Gaithersburg, MD 20882
Based in Clarksburg, 5 mi away
89/100CR ScoreRanked #4 because of its Google rating and availability: 4.8★ from 452 Google reviews, open 24/7.
- 4.8★ from 452 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Germantown, 5 mi away
89/100CR ScoreRanked #5 because of its Google rating and availability: 5.0★ from 128 Google reviews, open 24/7.
- 5.0★ from 128 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 13238 Executive Park Terrace Ste 1, Germantown, MD 20874
Based in Washington, D.C., 16 mi away
89/100CR ScoreRanked #6 because of its Google rating and availability: 4.8★ from 2,719 Google reviews, open 24/7.
- 4.8★ from 2,719 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5125 MacArthur Blvd NW Ste 13, Washington, DC 20016
Based in Gaithersburg
89/100CR ScoreRanked #7 because of its Google rating and availability: 4.8★ from 2,083 Google reviews, open 24/7.
- 4.8★ from 2,083 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 7940 Cessna Ave, Gaithersburg, MD 20879
Based in Bethesda, 12 mi away
89/100CR ScoreRanked #8 because of its Google rating and availability: 4.8★ from 1,211 Google reviews, open 24/7.
- 4.8★ from 1,211 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 4641 Montgomery Ave Ste 518, Bethesda, MD 20814
Based in Germantown, 5 mi away
89/100CR ScoreRanked #9 because of its Google rating and availability: 5.0★ from 111 Google reviews, open 24/7.
- 5.0★ from 111 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 13505 Deerwater Dr, Germantown, MD 20874
#10 The Drain Guys
Based in Gaithersburg
89/100CR ScoreRanked #10 because of its Google rating and availability: 4.7★ from 168 Google reviews, open 24/7.
- 4.7★ from 168 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 8041 Cessna Ave Ste 100, Gaithersburg, MD 20879
Based in Bethesda, 9 mi away
88/100CR ScoreRanked #11 because of its Google rating and availability: 4.9★ from 296 Google reviews, open 24/7.
- 4.9★ from 296 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 6701 Democracy Blvd Suite 362, Bethesda, MD 20817
Based in Beltsville, 18 mi away
88/100CR ScoreRanked #12 because of its Google rating and availability: 4.9★ from 1,368 Google reviews, open 24/7.
- 4.9★ from 1,368 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 10739 Tucker St Suite 100-B, Beltsville, MD 20705
Based in Germantown, 4 mi away
88/100CR ScoreRanked #13 because of its Google rating and availability: 5.0★ from 87 Google reviews, open 24/7.
- 5.0★ from 87 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 13414 Fountain Club Dr, Germantown, MD 20874
Based in Rockville, 5 mi away
88/100CR ScoreRanked #14 because of its Google rating and availability: 4.7★ from 5,985 Google reviews, open 24/7.
- 4.7★ from 5,985 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 685 Lofstrand Ln, Rockville, MD 20850
#15 Big Guy Plumbing
Based in Catonsville, 5 mi away
88/100CR ScoreRanked #15 because of its Google rating and availability: 5.0★ from 71 Google reviews, open 24/7.
- 5.0★ from 71 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Gaithersburg
88/100CR ScoreRanked #16 because of its Google rating and availability: 5.0★ from 35 Google reviews, open 24/7.
- 5.0★ from 35 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 19110 Montgomery Village Ave suite 807, Gaithersburg, MD 20886
Based in Sterling, 13 mi away
88/100CR ScoreRanked #17 because of its Google rating and availability: 4.8★ from 647 Google reviews, open 24/7.
- 4.8★ from 647 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 46179 Westlake Dr #330, Sterling, VA 20165
Based in Rockville, 4 mi away
88/100CR ScoreRanked #18 because of its Google rating and trade focus: 4.9★ from 652 Google reviews, listed on Google as “Plumber”.
- 4.9★ from 652 Google reviews
- Hours
- Mon–Thu 7 AM–9 PM · Fri 7 AM–5 PM · Sat–Sun 9 AM–5 PM
- Address
- 706B E Gude Dr #3, Rockville, MD 20850
Based in Darnestown, 1 mi away
87/100CR ScoreRanked #19 because of its Google rating and availability: 5.0★ from 29 Google reviews, open 24/7.
- 5.0★ from 29 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Silver Spring, 12 mi away
87/100CR ScoreRanked #20 because of its Google rating and availability: 4.8★ from 417 Google reviews, open 24/7.
- 4.8★ from 417 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2600 Forest Glen Rd suite a, Silver Spring, MD 20910
#21 Your 1 Plumber
Based in Germantown, 5 mi away
87/100CR ScoreRanked #21 because of its Google rating and availability: 4.6★ from 314 Google reviews, open 24/7.
- 4.6★ from 314 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 13504 Jamieson Pl, Germantown, MD 20874
Based in Gaithersburg
87/100CR ScoreRanked #22 because of its Google rating and availability: 4.8★ from 666 Google reviews, open 24/7.
- 4.8★ from 666 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 18918 Premiere Ct, Gaithersburg, MD 20879
Based in Beltsville, 17 mi away
87/100CR ScoreRanked #23 because of its Google rating and availability: 4.8★ from 1,053 Google reviews, open 24/7.
- 4.8★ from 1,053 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 12000 Indian Creek Ct, Beltsville, MD 20705
Based in Arlington, 18 mi away
87/100CR ScoreRanked #24 because of its Google rating and availability: 4.9★ from 571 Google reviews, open 24/7.
- 4.9★ from 571 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2219 N Columbus St #204, Arlington, VA 22207
Based in Eldersburg, 13 mi away
87/100CR ScoreRanked #25 because of its Google rating and availability: 5.0★ from 153 Google reviews, open 24/7.
- 5.0★ from 153 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Plumbers ranked #26 to #50
#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 805 ranked plumbers here; the rest are on their profiles.
Also serving Gaithersburg
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.
| Business | Google rating | Distance |
|---|---|---|
| A&A General Contracting Pros | 5.0★ (3) | In Gaithersburg |
| All Clear Plumbing & Drain Service, LLC | 4.8★ (547) | 19 mi |
| Apex Home Solutions | 1.0★ (1) | In Gaithersburg |
| Bath & Floor Stiles Inc. | 4.6★ (18) | In Gaithersburg |
| Elegant Homes,inc. | 4.9★ (64) | In Gaithersburg |
| Gaithersburg Plumbing Pros | 4.1★ (80) | In Gaithersburg |
| H L Harris Plumbing & Heating | 5.0★ (1) | In Gaithersburg |
| H Plumbing Inc. | 5.0★ (2) | 4 mi |
| Hambleton Handyman | In Gaithersburg | |
| Home Services at The Home Depot | 3.5★ (2) | 5 mi |
| I. Morales Remodeling LLC | In Gaithersburg | |
| KCK Air Conditioning & Heating Consultants, LLC | 4.7★ (13) | In Gaithersburg |
| KSM | 5.0★ (1) | In Gaithersburg |
| Maryland Plumbing & Heating | In Gaithersburg | |
| Myers Plumbing Services Germantown MD | 5.0★ (2) | 5 mi |
| Presidential, Inc. | 4.9★ (1,701) | In Gaithersburg |
| Rocket Rooter Plumbing | 3.0★ (2) | 5 mi |
| S.L. Johnson Plumbing & Heating | 3.0★ (2) | 5 mi |
| Top Tier Trenchless Sewer and Water Line Repair | 5.0★ (1) | In Gaithersburg |
| TruBlue Home Service Ally | 4.8★ (36) | In Gaithersburg |
How much do plumbers cost in Gaithersburg?
National price ranges in USD, not adjusted for Gaithersburg. 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 |
How to check a plumber's license in Maryland
In Maryland, Maryland State Board of Plumbing licenses Plumbing work: water supply, drain, waste and vent piping and fixtures.
- Check that the status is active and the name matches the contract or truck.
- Ask for proof of insurance before work starts.
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
How we ranked Gaithersburg plumbers
We scored 805 Gaithersburg 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 Gaithersburg 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 |
Plumbers in Gaithersburg: frequently asked questions
Who is the best plumber in Gaithersburg?
By CR Score, the highest-ranked plumber in Gaithersburg, MD is MoCo Plumbing, LLC with a CR Score of 91/100. It has 5.0★ from 482 Google reviews. It is open 24/7. Roto-Rooter Plumbing & Water Cleanup (#2) and Benjamin Franklin Plumbing of Gaithersburg (#3) follow. We ranked 805 plumbers on 8 factors, last updated October 22, 2026.
How many plumbers are there in Gaithersburg?
ContractorsRanked ranks 805 plumbers serving Gaithersburg, MD. 5 of them are based in Gaithersburg; the rest serve it from nearby towns. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.
Which plumbers in Gaithersburg are open 24/7?
274 ranked plumbers in Gaithersburg post 24/7 hours. The highest-ranked are MoCo Plumbing, LLC (#1), Roto-Rooter Plumbing & Water Cleanup (#2) and Benjamin Franklin Plumbing of Gaithersburg (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which plumbers in Gaithersburg work on weekends?
502 of 805 ranked plumbers post Saturday hours and 381 post Sunday hours. The highest-ranked open Saturdays are MoCo Plumbing, LLC (#1), Roto-Rooter Plumbing & Water Cleanup (#2) and Benjamin Franklin Plumbing of Gaithersburg (#3). Posted hours are office hours; crews may book weekend jobs separately.
How do I check a plumber's license in Maryland?
In Maryland, Maryland State Board of Plumbing handles licensing and covers Plumbing work: water supply, drain, waste and vent piping and fixtures.
How much does water heater replacement cost in Gaithersburg?
Water heater replacement typically costs $882 to $1,826, with $1,348 typical (Per unit, installed (unit plus labor); typical range of customer-reported jobs. US national range). This is a national range, not adjusted for Gaithersburg. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Gaithersburg plumbers have?
The median Google rating among 805 rated plumbers in Gaithersburg is 4.8★, with a median of 31 reviews. Len The Plumber Heating & Air, LLC has the most, 8,136 reviews, and ranks #50. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ContractorsRanked rank plumbers?
Each plumber gets a 0–100 CR Score from 8 published factors, led by reputation (35%), credentials (15%), review volume (10%) and recency (10%). Factors we cannot measure are left out, not scored as zero. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.
Update log for Gaithersburg
- October 2026: CR Scores recalculated for 805 plumbers serving Gaithersburg.
- October 2026: 6 duplicate listings merged.
More plumbers and Gaithersburg pages
Plumbers near Gaithersburg
- Plumbers in Montgomery Village, MD715 ranked
- Plumbers in Redland, MD837 ranked
- Plumbers in Germantown, MD658 ranked
- Plumbers in Rockville, MD862 ranked
- Plumbers in North Potomac, MD820 ranked
- Plumbers in Darnestown, MD791 ranked
- Plumbers in Travilah, MD844 ranked
- Plumbers in Olney, MD796 ranked
- Plumbers in Rossmoor, MD877 ranked
- Plumbers in Leisure World, MD880 ranked
Other trades in Gaithersburg
- Roofers in Gaithersburg1543 ranked
- Electricians in Gaithersburg708 ranked
- HVAC contractors in Gaithersburg1005 ranked
- General contractors in Gaithersburg1539 ranked
- Painters in Gaithersburg285 ranked
- Landscapers in Gaithersburg320 ranked
- Handymen in Gaithersburg172 ranked
- Kitchen remodelers in Gaithersburg1188 ranked
- Bathroom remodelers in Gaithersburg1182 ranked
- Flooring contractors in Gaithersburg806 ranked
- Tile installers in Gaithersburg83 ranked
- Drywall contractors in Gaithersburg12 ranked
- Concrete contractors in Gaithersburg334 ranked
- Fence contractors in Gaithersburg194 ranked
- Deck builders in Gaithersburg461 ranked
- Siding contractors in Gaithersburg663 ranked
- Window installers in Gaithersburg730 ranked
- Gutter installers in Gaithersburg361 ranked
- Insulation contractors in Gaithersburg140 ranked
- Solar installers in Gaithersburg196 ranked
- Garage door repair companies in Gaithersburg166 ranked
- Foundation repair companies in Gaithersburg219 ranked
- Tree services in Gaithersburg332 ranked
- Masonry contractors in Gaithersburg323 ranked
- Water damage restoration companies in Gaithersburg891 ranked
- Home builders in Gaithersburg813 ranked
- Demolition contractors in Gaithersburg90 ranked
- All contractors in Gaithersburg