122 plumbers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in St. Catharines: Reliance Heating, Air Conditioning & Plumbing, CR Score 91/100; 4.8★ from 2,986 Google reviews; open 24/7.
Best for emergencies (open 24/7): PLUMBER ON DEMAND of THOROLD, ON, posts 24/7 hours; ranked #2 of 122.
Most-reviewed: T-Mark Plumbing, Heating & Cooling- Buffalo, 3,978 Google reviews at 4.9★, the most of 122 ranked; ranked #10.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
122 St. Catharines plumbers are ranked here by CR Score, from 8 published factors. 53 are open 24/7, 67 open Saturdays and 57 open Sundays, based on posted hours. The median Google rating is 4.8★ across 122 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Reliance Heating, Air Conditioning & Plumbing | 91 | 4.8★ (2,986) | St. Catharines | 24/7 | Overall |
| 2 | PLUMBER ON DEMAND of THOROLD, ON | 89 | 5.0★ (115) | Fort Erie, 14 km away | 24/7 | Emergencies |
| 3 | Mr. Furnace Heating and Air Conditioning | 88 | 4.8★ (2,672) | St. Catharines | 24/7 | — |
| 4 | Plumr Plumbing & Heating | 87 | 4.9★ (121) | Welland, 20 km away | 24/7 | — |
| 5 | PLUMBER ON DEMAND of NIAGARA REGION, ON | 87 | 4.6★ (186) | Fort Erie, 14 km away | 24/7 | — |
| 6 | All Pro Plumbing | 87 | 4.9★ (337) | Tonawanda, 35 km away | 24/7 | — |
| 7 | Enercare | 86 | 4.6★ (2,788) | St. Catharines | 24/7 | — |
| 8 | Lakeview Plumbing Services | 86 | 5.0★ (233) | Hamilton, 38 km away | 24/7 | — |
| 9 | Sewer pro plumbing | 86 | 5.0★ (160) | Fort Erie, 34 km away | 24/7 | — |
| 10 | T-Mark Plumbing, Heating & Cooling- Buffalo | 86 | 4.9★ (3,978) | Buffalo, 40 km away | 24/7 | Most reviews |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and availability: 4.8★ from 2,986 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Fort Erie, 14 km away
Ranked #2 because of its Google rating and availability: 5.0★ from 115 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Catharines
Ranked #3 because of its Google rating and availability: 4.8★ from 2,672 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Welland, 20 km away
Ranked #4 because of its Google rating and availability: 4.9★ from 121 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Fort Erie, 14 km away
Ranked #5 because of its Google rating and availability: 4.6★ from 186 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Tonawanda, 35 km away
Ranked #6 because of its Google rating and availability: 4.9★ from 337 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Catharines
Ranked #7 because of its Google rating and availability: 4.6★ from 2,788 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Hamilton, 38 km away
Ranked #8 because of its Google rating and availability: 5.0★ from 233 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Fort Erie, 34 km away
Ranked #9 because of its Google rating and availability: 5.0★ from 160 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Buffalo, 40 km away
Ranked #10 because of its Google rating and review volume: 4.9★ from 3,978 Google reviews, the most Google reviews on this list (3,978).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Catharines
Ranked #11 because of its Google rating and availability: 4.4★ from 14 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Tonawanda, 34 km away
Ranked #12 because of its Google rating and availability: 4.8★ from 3,074 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Catharines
Ranked #13 because of its Google rating and availability: 5.0★ from 6 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Catharines
Ranked #14 because of its Google rating and availability: 4.9★ from 60 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Welland, 22 km away
Ranked #15 because of its Google rating and availability: 4.7★ from 87 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Tonawanda, 35 km away
Ranked #16 because of its Google rating and trade focus: 4.9★ from 946 Google reviews, listed on Google as “Plumber”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Milton, 37 km away
Ranked #17 because of its Google rating and availability: 5.0★ from 107 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Tonawanda, 35 km away
Ranked #18 because of its Google rating and trade focus: 4.8★ from 1,323 Google reviews, listed on Google as “Plumber”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Hamilton, 33 km away
Ranked #19 because of its Google rating and availability: 5.0★ from 47 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Grand Island, 29 km away
Ranked #20 because of its Google rating and availability: 4.9★ from 45 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in St. Catharines
Ranked #21 because of its Google rating and availability: 5.0★ from 5 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Port Colborne, 30 km away
Ranked #22 because of its Google rating and availability: 5.0★ from 35 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Thorold, 11 km away
Ranked #23 because of its Google rating and trade focus: 5.0★ from 44 Google reviews, listed on Google as “Plumber”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Fort Erie, 33 km away
Ranked #24 because of its Google rating and availability: 4.9★ from 51 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Hamilton, 28 km away
Ranked #25 because of its Google rating and availability: 4.7★ from 49 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
#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 122 ranked plumbers here; the rest are on their profiles.
20 more plumbers within 40 km that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| A1R One Heating & Cooling | 3.7★ (19) | In St. Catharines |
| Base Mechanical Inc | In St. Catharines | |
| Bathroom & Kitchen Solutions | 3.9★ (68) | In St. Catharines |
| Budget Plumbing | 2.8★ (15) | 34 km |
| Castle Plumbing & Heating Inc. | In St. Catharines | |
| GL Trade Services LTD | 5.0★ (2) | In St. Catharines |
| Go Green Plumbing Ltd | In St. Catharines | |
| Guest Plumbing & HVAC | 5.0★ (1) | In St. Catharines |
| H.W. Bryk and Sons | 4.3★ (75) | 21 km |
| Ken's Plumbing Services | 3.3★ (3) | 32 km |
| Landolt Plumbing & Htg | 3.0★ (1) | In St. Catharines |
| North Star Land Service | 5.0★ (1) | In St. Catharines |
| One Stop Renovations | In St. Catharines | |
| Pappas Plumbing | 5.0★ (8) | 39 km |
| Plumbing in Pink Solutions | 5.0★ (1) | In St. Catharines |
| Preferred Plumbing Solutions inc. | In St. Catharines | |
| Royal Flush Kitchen & Baths | 5.0★ (1) | In St. Catharines |
| Tony's Toilets | In St. Catharines | |
| WorryFree Home Services | 4.6★ (21) | 39 km |
| Zeke & Company Countertops | 4.9★ (146) | In St. Catharines |
US national ranges converted to CAD, not adjusted for St. Catharines. Each row names its basis and the month we checked it.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Water heater replacement | CA$1,240 | CA$1,890 | CA$2,570 | Per unit, installed (unit plus labor); typical range of customer-reported jobs. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026) | October 2026 |
We scored 122 St. Catharines 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 St. Catharines 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 |