91/100CR Score
Ranked #1 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
Best Plumbers in Potomac, MD (2026)
818 plumbers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Potomac: Roto-Rooter Plumbing & Water Cleanup, CR Score 91/100; 4.8★ from 2,719 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Roto-Rooter Plumbing & Water Cleanup, posts 24/7 hours; ranked #2 of 818.
- 42
Most-reviewed: Len The Plumber Heating & Air, LLC, 8,136 Google reviews at 4.6★, the most of 818 ranked; ranked #42.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
818 Potomac plumbers are ranked here by CR Score, from 8 published factors. 297 are open 24/7, 527 open Saturdays and 403 open Sundays, based on posted hours. The median Google rating is 4.9★ across 818 rated businesses.
Top 10 plumbers in Potomac at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Roto-Rooter Plumbing & Water Cleanup | 91 | 4.8★ (2,719) | Washington, D.C., 9 mi away | 24/7 | Overall |
| 2 | Roto-Rooter Plumbing & Water Cleanup | 90 | 4.8★ (1,061) | Rockville, 6 mi away | 24/7 | Emergencies |
| 3 | Roto-Rooter Plumbing & Water Cleanup | 90 | 4.8★ (1,211) | Bethesda, 7 mi away | 24/7 | — |
| 4 | MoCo Plumbing, LLC | 90 | 5.0★ (482) | Germantown, 10 mi away | 24/7 | — |
| 5 | Handyman At Your Command | 90 | 4.9★ (296) | Bethesda, 4 mi away | 24/7 | — |
| 6 | Home Service Doctors | 89 | 4.8★ (2,036) | Fairfax, 13 mi away | 24/7 | — |
| 7 | Roto-Rooter Plumbing & Water Cleanup | 89 | 4.9★ (571) | Arlington, 10 mi away | 24/7 | — |
| 8 | Cardinal Plumbing Heating & Air Inc | 89 | 4.9★ (1,720) | Alexandria, 17 mi away | 24/7 | — |
| 9 | Len the Plumber Heating & Air, LLC | 89 | 4.7★ (6,899) | Alexandria, 17 mi away | 24/7 | — |
| 10 | Cherry Blossom Plumbing | 89 | 4.9★ (453) | Arlington, 10 mi away | 24/7 | — |
The 818 best plumbers in Potomac, 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, 6 mi away
90/100CR 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 Bethesda, 7 mi away
90/100CR ScoreRanked #3 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, 10 mi away
90/100CR ScoreRanked #4 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
Based in Bethesda, 4 mi away
90/100CR ScoreRanked #5 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 Fairfax, 13 mi away
89/100CR ScoreRanked #6 because of its Google rating and availability: 4.8★ from 2,036 Google reviews, open 24/7.
- 4.8★ from 2,036 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 10560 Main St Suite PS 100, Fairfax, VA 22030
Based in Arlington, 10 mi away
89/100CR ScoreRanked #7 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 Alexandria, 17 mi away
89/100CR ScoreRanked #8 because of its Google rating and availability: 4.9★ from 1,720 Google reviews, open 24/7.
- 4.9★ from 1,720 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1727 King St Suite 123, Alexandria, VA 22314
Based in Alexandria, 17 mi away
89/100CR ScoreRanked #9 because of its Google rating and availability: 4.7★ from 6,899 Google reviews, open 24/7.
- 4.7★ from 6,899 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 6598B Fleet Dr, Alexandria, VA 22310
Based in Arlington, 10 mi away
89/100CR ScoreRanked #10 because of its Google rating and availability: 4.9★ from 453 Google reviews, open 24/7.
- 4.9★ from 453 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2219B N Columbus St #304, Arlington, VA 22207
Based in Beltsville, 16 mi away
89/100CR ScoreRanked #11 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 Falls Church, 11 mi away
89/100CR ScoreRanked #12 because of its Google rating and availability: 4.9★ from 467 Google reviews, open 24/7.
- 4.9★ from 467 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 7139 Noland Rd, Falls Church, VA 22042
Based in Springfield, 15 mi away
88/100CR ScoreRanked #13 because of its Google rating and availability: 4.8★ from 1,503 Google reviews, open 24/7.
- 4.8★ from 1,503 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5325 Port Royal Rd #101, Springfield, VA 22151
Based in Sterling, 10 mi away
88/100CR ScoreRanked #14 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 Silver Spring, 8 mi away
88/100CR ScoreRanked #15 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
Based in Annandale, 12 mi away
88/100CR ScoreRanked #16 because of its Google rating and availability: 5.0★ from 220 Google reviews, open 24/7.
- 5.0★ from 220 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 7401 Valleycrest Blvd, Annandale, VA 22003
Based in Dale City, 12 mi away
88/100CR ScoreRanked #17 because of its Google rating and availability: 5.0★ from 206 Google reviews, open 24/7.
- 5.0★ from 206 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Reston, 9 mi away
88/100CR ScoreRanked #18 because of its Google rating and availability: 4.9★ from 184 Google reviews, open 24/7.
- 4.9★ from 184 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1900 Campus Commons Dr Ste 105, Reston, VA 20191
Based in Gainesville, 15 mi away
88/100CR ScoreRanked #19 because of its Google rating and availability: 4.9★ from 498 Google reviews, open 24/7.
- 4.9★ from 498 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Rockville, 7 mi away
88/100CR ScoreRanked #20 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
Based in Vienna, 10 mi away
88/100CR ScoreRanked #21 because of its Google rating and availability: 4.8★ from 338 Google reviews, open 24/7.
- 4.8★ from 338 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2740 Chain Bridge Rd #104, Vienna, VA 22181
Based in Alexandria, 17 mi away
87/100CR ScoreRanked #22 because of its Google rating and availability: 4.9★ from 671 Google reviews, open 24/7.
- 4.9★ from 671 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 4508 Apple Tree Dr, Alexandria, VA 22310
Based in Silver Spring, 10 mi away
87/100CR ScoreRanked #23 because of its Google rating and availability: 4.8★ from 293 Google reviews, open 24/7.
- 4.8★ from 293 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 817 Silver Spring Ave Ste 110C, Silver Spring, MD 20910
Based in Beltsville, 17 mi away
87/100CR ScoreRanked #24 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 Alexandria, 21 mi away
87/100CR ScoreRanked #25 because of its Google rating and availability: 4.9★ from 1,029 Google reviews, open 24/7.
- 4.9★ from 1,029 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 8332 Richmond Hwy #207, Alexandria, VA 22309
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 818 ranked plumbers here; the rest are on their profiles.
Also serving Potomac
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 |
|---|---|---|
| changepro USA | 1.0★ (2) | 9 mi |
| Classic Drainage Inc. | 5.0★ (2) | 6 mi |
| Conrod's Plumbing Heating and A/C | 5.0★ (2) | 10 mi |
| DMV Plumbing Services | 5.0★ (2) | 9 mi |
| Fast Multi Service Contractor | 5.0★ (2) | In Potomac |
| First Class Plumbing | 2.5★ (2) | 10 mi |
| H Plumbing Inc. | 5.0★ (2) | 11 mi |
| HiTrend Plumbers of NOVA | In Potomac | |
| John R Plumbing LLC – Emergency Plumbing, Water Heater & Drain Service | 4.9★ (178) | 16 mi |
| Maverick Plumbing & Hvac | In Potomac | |
| Mc Lean Plumbing Services | 3.0★ (2) | 9 mi |
| Philios Plumbing & Drains | 5.0★ (2) | 12 mi |
| Rocket Rooter Plumbing | 3.0★ (2) | 4 mi |
| Rogers Plumbing | 3.0★ (2) | 11 mi |
| S.L. Johnson Plumbing & Heating | 3.0★ (2) | 6 mi |
| Schevan Plumbing | 5.0★ (1) | In Potomac |
| The Drain Guys | 4.7★ (168) | 11 mi |
| TinyGiants Plumbing | In Potomac | |
| WH Professional Plumbing Services | 5.0★ (2) | 10 mi |
| Your 1 Plumber | 4.6★ (314) | 11 mi |
How much do plumbers cost in Potomac?
National price ranges in USD, not adjusted for Potomac. 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 Potomac plumbers
We scored 818 Potomac 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 Potomac 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 Potomac: frequently asked questions
Who is the best plumber in Potomac?
By CR Score, the highest-ranked plumber in Potomac, MD is Roto-Rooter Plumbing & Water Cleanup with a CR Score of 91/100. It has 4.8★ from 2,719 Google reviews. It is open 24/7. Roto-Rooter Plumbing & Water Cleanup (#2) and Roto-Rooter Plumbing & Water Cleanup (#3) follow. We ranked 818 plumbers on 8 factors, last updated October 22, 2026.
How many plumbers are there in Potomac?
ContractorsRanked ranks 818 plumbers serving Potomac, MD. Another 20 within 25 mi are listed but not ranked yet. Counts are as of October 2026.
Which plumbers in Potomac are open 24/7?
297 ranked plumbers in Potomac post 24/7 hours. The highest-ranked are Roto-Rooter Plumbing & Water Cleanup (#1), Roto-Rooter Plumbing & Water Cleanup (#2) and Roto-Rooter Plumbing & Water Cleanup (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which plumbers in Potomac work on weekends?
527 of 818 ranked plumbers post Saturday hours and 403 post Sunday hours. The highest-ranked open Saturdays are Roto-Rooter Plumbing & Water Cleanup (#1), Roto-Rooter Plumbing & Water Cleanup (#2) and Roto-Rooter Plumbing & Water Cleanup (#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 Potomac?
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 Potomac. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Potomac plumbers have?
The median Google rating among 818 rated plumbers in Potomac is 4.9★, with a median of 33 reviews. Len The Plumber Heating & Air, LLC has the most, 8,136 reviews, and ranks #42. 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 Potomac
- October 2026: CR Scores recalculated for 818 plumbers serving Potomac.
- October 2026: 7 duplicate listings merged.
More plumbers and Potomac pages
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