91/100CR Score
Ranked #1 because of its Google rating and availability: 4.9★ from 134 Google reviews, open 24/7.
- 4.9★ from 134 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 12 King Ave, Frederick, MD 21701
Best Plumbers in Frederick, MD (2026)
234 plumbers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Frederick: Zo Plumbing and Drain Cleaning LLC, CR Score 91/100; 4.9★ from 134 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Agape Drain & Plumbing LLC, posts 24/7 hours; ranked #2 of 234.
- 31
Most-reviewed: Larry & Sons Plumbing, Heating, Cooling, Drain & Electrical, 4,764 Google reviews at 4.8★, the most of 234 ranked; ranked #31.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
234 Frederick plumbers are ranked here by CR Score, from 8 published factors. 81 are open 24/7, 133 open Saturdays and 101 open Sundays, based on posted hours. The median Google rating is 4.8★ across 234 rated businesses.
Top 10 plumbers in Frederick at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Zo Plumbing and Drain Cleaning LLC | 91 | 4.9★ (134) | Frederick | 24/7 | Overall |
| 2 | Agape Drain & Plumbing LLC | 90 | 5.0★ (63) | Frederick | 24/7 | Emergencies |
| 3 | Benjamin Franklin Plumbing of Frederick | 90 | 4.7★ (186) | Frederick | 24/7 | — |
| 4 | Key City Plumbing & Contracting | 89 | 4.9★ (73) | Frederick | 24/7 | — |
| 5 | Tri-County Pump Service, Inc. | 89 | 5.0★ (53) | Frederick | 24/7 | — |
| 6 | Wenbrooke Services - Electrical, Plumbing, Heating and Air | 89 | 4.8★ (1,208) | Frederick | 24/7 | — |
| 7 | Larry & Sons Plumbing, Heating, Cooling, Drain & Electrical | 89 | 4.8★ (932) | Frederick | 24/7 | — |
| 8 | Markool Heating Cooling Plumbing | 89 | 4.9★ (547) | Frederick | 24/7 | — |
| 9 | MoCo Plumbing, LLC | 88 | 5.0★ (482) | Germantown, 20 mi away | 24/7 | — |
| 10 | Kline's Plumbing,LLC | 88 | 5.0★ (29) | Frederick | 24/7 | — |
The 234 best plumbers in Frederick, 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 Frederick
90/100CR ScoreRanked #2 because of its Google rating and availability: 5.0★ from 63 Google reviews, open 24/7.
- 5.0★ from 63 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Frederick
90/100CR ScoreRanked #3 because of its Google rating and availability: 4.7★ from 186 Google reviews, open 24/7.
- 4.7★ from 186 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 6639 Ballenger Run Blvd, Frederick, MD 21703
Based in Frederick
89/100CR ScoreRanked #4 because of its Google rating and availability: 4.9★ from 73 Google reviews, open 24/7.
- 4.9★ from 73 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Frederick
89/100CR ScoreRanked #5 because of its Google rating and availability: 5.0★ from 53 Google reviews, open 24/7.
- 5.0★ from 53 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1209-A N East St Suite 104, Frederick, MD 21701
Based in Frederick
89/100CR ScoreRanked #6 because of its Google rating and availability: 4.8★ from 1,208 Google reviews, open 24/7.
- 4.8★ from 1,208 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 4907 International Blvd #113, Frederick, MD 21703
Based in Frederick
89/100CR ScoreRanked #7 because of its Google rating and availability: 4.8★ from 932 Google reviews, open 24/7.
- 4.8★ from 932 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5744 Industry Ln Suite N, Frederick, MD 21704
Based in Frederick
89/100CR ScoreRanked #8 because of its Google rating and availability: 4.9★ from 547 Google reviews, open 24/7.
- 4.9★ from 547 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 5304C Kings Ct, Frederick, MD 21703
Based in Germantown, 20 mi away
88/100CR ScoreRanked #9 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 Frederick
88/100CR ScoreRanked #10 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 Frederick
88/100CR ScoreRanked #11 because of its Google rating and trade focus: 5.0★ from 138 Google reviews, listed on Google as “Plumber”.
- 5.0★ from 138 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1323 Hillcrest Dr, Frederick, MD 21703
Based in Green Valley, 15 mi away
88/100CR ScoreRanked #12 because of its Google rating and availability: 4.8★ from 461 Google reviews, open 24/7.
- 4.8★ from 461 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2702 Back Acre Cir #110, Mt Airy, MD 21771
Based in Eldersburg, 15 mi away
88/100CR ScoreRanked #13 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
Based in Frederick
87/100CR ScoreRanked #14 because of its Google rating and review volume: 4.9★ from 1,614 Google reviews, 1,614 Google reviews.
- 4.9★ from 1,614 Google reviews
- Hours
- Mon–Sun 8 AM–5 PM
- Address
- 4650 Wedgewood Blvd #102, Frederick, MD 21703
Based in Clarksburg, 17 mi away
87/100CR ScoreRanked #15 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 Frederick
87/100CR ScoreRanked #16 because of its Google rating and availability: 5.0★ from 18 Google reviews, open 24/7.
- 5.0★ from 18 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Frederick
87/100CR ScoreRanked #17 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
- 617 W Patrick St Suite 220, Frederick, MD 21701
Based in Frederick
87/100CR ScoreRanked #18 because of its Google rating and availability: 5.0★ from 14 Google reviews, open 24/7.
- 5.0★ from 14 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Gaithersburg, 17 mi away
87/100CR ScoreRanked #19 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 Germantown, 18 mi away
86/100CR ScoreRanked #20 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 Germantown, 17 mi away
86/100CR ScoreRanked #21 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
Based in Frederick
86/100CR ScoreRanked #22 because of its Google rating and trade focus: 5.0★ from 353 Google reviews, listed on Google as “Plumber”.
- 5.0★ from 353 Google reviews
- Hours
- Mon–Sat 9 AM–8 PM · Sun closed
- Address
- 619 Huntover Ln, Frederick, MD 21703
Based in Leesburg, 23 mi away
86/100CR ScoreRanked #23 because of its Google rating and availability: 4.9★ from 308 Google reviews, open 24/7.
- 4.9★ from 308 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 722 E Market Street, VM13 Suite 102, Leesburg, VA 20176
Based in Ballenger Creek, 9 mi away
86/100CR ScoreRanked #24 because of its Google rating and availability: 5.0★ from 62 Google reviews, open 24/7.
- 5.0★ from 62 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Frederick
86/100CR ScoreRanked #25 because of its Google rating and availability: 4.9★ from 9 Google reviews, open 24/7.
- 4.9★ from 9 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 234 ranked plumbers here; the rest are on their profiles.
Also serving Frederick
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 |
|---|---|---|
| Another Plumber, Inc. | 5.0★ (29) | 22 mi |
| Bob Waltz NE Plumbing & Heating | In Frederick | |
| Brick Street Plumbing & HVAC | 4.2★ (364) | In Frederick |
| Brick Street Plumbing, Water Heaters, AC & Furnace Repair | 4.6★ (203) | 22 mi |
| Chesky Plumbing | 5.0★ (3) | In Frederick |
| Cool Breeze Plumbing, Heating & A/C | 4.8★ (666) | 22 mi |
| Curaflo Mid Atlantic | 5.0★ (1) | In Frederick |
| David Williams Electric | 5.0★ (495) | In Frederick |
| Home Services at The Home Depot | 1.0★ (1) | In Frederick |
| JVR Plumbing, LLC | 5.0★ (2) | In Frederick |
| LJ Home Services LLC | 5.0★ (11) | In Frederick |
| Lowe's Home Improvement | 4.2★ (1,174) | In Frederick |
| Mike Dhima LLC | 5.0★ (1) | In Frederick |
| Mr. Handyman of Greater Frederick and Hagerstown | 4.7★ (423) | In Frederick |
| Richard Young Plumbing | 5.0★ (1) | In Frederick |
| Rocket Rooter | 5.0★ (1) | In Frederick |
| Rooter-Man | 5.0★ (1) | In Frederick |
| SB Plumbing, LLC | 5.0★ (2) | In Frederick |
| Southern States -Frederick Petroleum Service | 4.0★ (31) | In Frederick |
| Sterling General Contractors | 4.8★ (26) | In Frederick |
How much do plumbers cost in Frederick?
National price ranges in USD, not adjusted for Frederick. 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 Frederick plumbers
We scored 234 Frederick 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 Frederick 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 Frederick: frequently asked questions
Who is the best plumber in Frederick?
By CR Score, the highest-ranked plumber in Frederick, MD is Zo Plumbing and Drain Cleaning LLC with a CR Score of 91/100. It has 4.9★ from 134 Google reviews. It is open 24/7. Agape Drain & Plumbing LLC (#2) and Benjamin Franklin Plumbing of Frederick (#3) follow. We ranked 234 plumbers on 8 factors, last updated October 22, 2026.
How many plumbers are there in Frederick?
ContractorsRanked ranks 234 plumbers serving Frederick, MD. 23 of them are based in Frederick; 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 Frederick are open 24/7?
81 ranked plumbers in Frederick post 24/7 hours. The highest-ranked are Zo Plumbing and Drain Cleaning LLC (#1), Agape Drain & Plumbing LLC (#2) and Benjamin Franklin Plumbing of Frederick (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which plumbers in Frederick work on weekends?
133 of 234 ranked plumbers post Saturday hours and 101 post Sunday hours. The highest-ranked open Saturdays are Zo Plumbing and Drain Cleaning LLC (#1), Agape Drain & Plumbing LLC (#2) and Benjamin Franklin Plumbing of Frederick (#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 Frederick?
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 Frederick. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Frederick plumbers have?
The median Google rating among 234 rated plumbers in Frederick is 4.8★, with a median of 29 reviews. Larry & Sons Plumbing, Heating, Cooling, Drain & Electrical has the most, 4,764 reviews, and ranks #31. 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 Frederick
- October 2026: CR Scores recalculated for 234 plumbers serving Frederick.
- October 2026: 3 duplicate listings merged.
More plumbers and Frederick pages
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- Kitchen remodelers in Frederick256 ranked
- Bathroom remodelers in Frederick263 ranked
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- Tile installers in Frederick25 ranked
- Drywall contractors in Frederick5 ranked
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- Deck builders in Frederick152 ranked
- Siding contractors in Frederick388 ranked
- Window installers in Frederick421 ranked
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- Solar installers in Frederick104 ranked
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