Best Plumbers in St Thomas, Ontario
The most trusted plumber in St Thomas, Ontario is Ambrose Plumbing & Heating, with a ProScore of 78/100.
The most trusted plumber in St Thomas, Ontario is Ambrose Plumbing & Heating, with a ProScore of 78/100. ProScore has verified 14 plumbers in St Thomas, scoring each across 10+ data sources and 20+ trust signals. 5 of the 14 are Trusted-tier (65+) or higher.
Last updated: June 20, 2026 · Data refreshed daily
Of 14 plumbers in St Thomas: 0 rated Elite (80+), 10 rated Trusted (65+), and 2 rated Good (50+).
How ProScore Ranks Plumbers
Every plumber in St Thomas is evaluated across four pillars: Reputation (ratings across multiple platforms), Verification (government licensing and WSIB), Transparency (online presence and profile completeness), and Sentiment (AI analysis of customer reviews). The result is a ProScore from 0 to 100.
Read the full methodology →Frequently Asked Questions
Who is the best plumber in St Thomas?
Ambrose Plumbing & Heating has the highest ProScore (78/100) among 14 verified plumbers in St Thomas, Ontario. Rankings are based on ProScore, which evaluates ratings, government licensing, WSIB coverage, and AI-analyzed customer sentiment.
How do I find a trustworthy plumber in St Thomas?
Look for plumbers with verified active WSIB coverage, and consistent ratings across multiple platforms. ProScore aggregates these signals into a single score from 0-100. In St Thomas, 0 plumbers hold Elite-tier ProScores (80+), 10 are Trusted-tier (65+), and 2 are Good-tier (50+).
Are plumbers in St Thomas licensed?
Plumbers in Ontario should hold valid business registration and active WSIB workers compensation coverage. ProScore verifies these credentials for every provider. Of the top 5 plumbers in St Thomas by ProScore, 3 carry active WSIB coverage.
How many verified plumbers are in St Thomas?
ProScore has verified and scored 14 plumbers in St Thomas, Ontario. Each provider is evaluated using 10+ data sources, 20+ trust signals, and AI-analyzed customer reviews. Data is refreshed daily.
What's the ProScore distribution among plumbers in St Thomas?
Among 14 verified plumbers in St Thomas, Ontario: 0 are Elite-tier (80+), 10 are Trusted-tier (65+), and 2 are Good-tier (50+). The top 5 average a ProScore of 76/100, with Ambrose Plumbing & Heating leading at 78/100.