Best Plumbers in Waterloo, Ontario
The most trusted plumber in Waterloo, Ontario is Koert Plumbing Ltd., with a ProScore of 74/100.
The most trusted plumber in Waterloo, Ontario is Koert Plumbing Ltd., with a ProScore of 74/100. ProScore has verified 18 plumbers in Waterloo, scoring each across 10+ data sources and 20+ trust signals. 2 of the 18 are Trusted-tier (70+) or higher.
Last updated: May 6, 2026 · Data refreshed daily
Of 18 plumbers in Waterloo: 0 rated Elite (82+), 2 rated Trusted (70+), and 10 rated Good (55+).
How ProScore Ranks Plumbers
Every plumber in Waterloo 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 Waterloo?
Koert Plumbing Ltd. has the highest ProScore (74/100) among 18 verified plumbers in Waterloo, 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 Waterloo?
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 Waterloo, 0 plumbers hold Elite-tier ProScores (82+), 2 are Trusted-tier (70+), and 10 are Good-tier (55+).
Are plumbers in Waterloo 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 Waterloo by ProScore, 4 carry active WSIB coverage.
How many verified plumbers are in Waterloo?
ProScore has verified and scored 18 plumbers in Waterloo, 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 Waterloo?
Among 18 verified plumbers in Waterloo, Ontario: 0 are Elite-tier (82+), 2 are Trusted-tier (70+), and 10 are Good-tier (55+). The top 5 average a ProScore of 70/100, with Koert Plumbing Ltd. leading at 74/100.