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Castro Valley, California · Plumbing

Plumbers in Castro Valley, CA

2 plumbers in Castro Valley, out of 5 HVAC and plumbing businesses the Registry lists there. Ranked by Registry Score, owner-confirmed records first.

Pros
2
Avg. score
54
Scored
2

Summary

Data last updated

As of October 14, 2026, the ProComfort Registry lists 2 plumbers in Castro Valley, California. Most-listed specialties: heating & furnaces (1), water heaters (1). 2 have enough public signals for a Registry Score, averaging 54 out of 100; 1 scores 70 or higher. Together they hold 353 public reviews on Google, Yelp and Facebook. The highest-scored is Harris Water Heaters, at 77 out of 100. 1 is Featured for 2026. View Harris Water Heaters.

Counts come straight from the Registry's records. How the Registry Score works

Showing 1–2 of 2

Plumbers in Castro Valley: at a glance

How many plumbers are in Castro Valley, California?
As of October 14, 2026, the ProComfort Registry lists 2 plumbers in Castro Valley, California.
Who is the highest-scored plumber in Castro Valley, California?
By Registry Score, Harris Water Heaters (Castro Valley, CA) ranks first at 77 out of 100, among 2 scored businesses averaging 54. The score combines public reviews (50 points), digital presence (30) and reach (20); nobody can pay for a higher score.
Which companies are featured in Castro Valley, California for 2026?
ProComfort Registry features Harris Water Heaters. Featured companies are selected editorially from public reviews and track record; listings and rankings are never sold.
How are plumbers in Castro Valley, California ranked?
By Registry Score (0-100, from public reviews, digital presence and reach), with records confirmed by their owners listed first. The full method is at https://procomfortregistry.online/methodology.

What this list includes: plumbing businesses, including drain, sewer, pipe, leak and water heater work. Tags come from each business's public category and name, so a company can appear under several trades. Plumbers across the US