11 plumbers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Key Largo: Nationwide Plumbing Service, CR Score 67/100; 4.7★ from 152 Google reviews; open 24/7.
Best for emergencies (open 24/7): Heath Townsend Plumbing and Septic, Inc, posts 24/7 hours; ranked #2 of 11.
Most-reviewed: Seaway Plumbing, Inc., 111 Google reviews at 4.8★, the most of 11 ranked after Nationwide Plumbing Service; ranked #3.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
11 Key Largo plumbers are ranked here by CR Score, from ten published factors. 4 are open 24/7, 3 open Saturdays and 3 open Sundays, based on posted hours. The median Google rating is 4.8★ across 11 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Nationwide Plumbing Service | 67 | 4.7★ (152) | Key Largo | 24/7 | Overall |
| 2 | Heath Townsend Plumbing and Septic, Inc | 64 | 4.7★ (41) | Islamorada, 1 mi away | 24/7 | Emergencies |
| 3 | Seaway Plumbing, Inc. | 62 | 4.8★ (111) | Key Largo | — | Most reviews |
| 4 | Express Trenchless FL Keys Sewer Repairs | 60 | 5.0★ (21) | Key Largo | 24/7 | — |
| 5 | Bayside Plumbing and Maintenance | 59 | 4.9★ (39) | Key Largo | — | — |
| 6 | Bayside Plumbing & Maintenance | 57 | 4.5★ (23) | Key Largo | — | — |
| 7 | Bradford Plumbing | 56 | 4.6★ (11) | Coral Gables, 20 mi away | 24/7 | — |
| 8 | A Royal Flush Drain Cleaning | 56 | 4.9★ (16) | Islamorada, 15 mi away | — | — |
| 9 | Coppertown Plumbing Inc. | 55 | 5.0★ (7) | Key Largo | — | — |
| 10 | Windy Day Plumbing | 54 | 5.0★ (25) | Islamorada, 15 mi away | — | — |
Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and review volume: 4.7★ from 152 Google reviews, the most in Key Largo.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Islamorada, 1 mi away
Ranked #2 because of its Google rating and trade focus: 4.7★ from 41 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Key Largo
Ranked #3 because of its Google rating and trade focus: 4.8★ from 111 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Key Largo
Ranked #4 because of its Google rating and trade focus: 5.0★ from 21 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Key Largo
Ranked #5 because of its Google rating and trade focus: 4.9★ from 39 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Key Largo
Ranked #6 because of its Google rating and trade focus: 4.5★ from 23 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Coral Gables, 20 mi away
Ranked #7 because of its Google rating and trade focus: 4.6★ from 11 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Islamorada, 15 mi away
Ranked #8 because of its Google rating and trade focus: 4.9★ from 16 Google reviews, listed on Google as “Plumber”.
Based on 7 of 10 factors; credentials, recency and availability not yet collected.
Based in Key Largo
Ranked #9 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Islamorada, 15 mi away
Ranked #10 because of its Google rating and trade focus: 5.0★ from 25 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
Based in Islamorada, 5 mi away
Ranked #11 because of its Google rating and trade focus: 4.3★ from 6 Google reviews, listed on Google as “Plumber”.
Based on 8 of 10 factors; credentials and recency not yet collected.
5 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 |
|---|---|---|
| Marlow's Plumbing, Inc. | In Key Largo | |
| Marlow's Plumbing, Inc. | 18 mi | |
| No Way Leak Detections & More LLC | 5.0★ (1) | 22 mi |
| Oreo Pro Services | 5.0★ (1) | 22 mi |
| RJK Plumbing Corp | 25 mi |
National price ranges in USD, not adjusted for Key Largo. 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 Florida, Florida Construction Industry Licensing Board (DBPR) licenses Certified or registered plumbing contractors (CFC, RF).
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 11 Key Largo plumbers on ten 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. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, 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 Key Largo data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Credentials | 15% | Active state license, bond and workers’ comp on file | Not yet collected |
| Review volume | 10% | Number of Google reviews, compared with the most-reviewed business on the list | Measured |
| Recency | 5% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 5% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | How clearly the business does this trade (its Google category and name) | Measured |
| Proximity | 5% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The business has claimed its ContractorsRanked profile (free or paid earn the same) | Measured |
| Partnered | 5% | The business links to ContractorsRanked from its own website with our badge, checked periodically | Measured |
| ContractorsRanked reviews | 10% | Verified customer reviews collected by ContractorsRanked: their rating and how many there are | Measured |