Top-Rated South Bay Plumbers
6 vetted contractors, thoroughly researched and ranked
Last Updated: January 25, 2026
Our Top Pick
Better Water Heaters
License #1060089 · Verified via CSLB
They maintain Diamond Certification with high customer satisfaction for two decades, a rare feat for a specialized plumbing contractor.
Platform Scores
(44)
(308)
A
20 yrs
Diamond Certified
Rinnai Authorized
Bradford White Authorized
24/7 Emergency
24 years in business, specializing in tankless and heat pump water heater installations across the South Bay. Distinguished by 20 consecutive years of Diamond Certification and owner-operated attention to detail. Best for homeowners seeking high-efficiency upgrades from a verified expert.
Essential Q&A
What makes them stand out?
They maintain Diamond Certification with high customer satisfaction for two decades, a rare feat for a specialized plumbing contractor.
Who should hire them?
Homeowners looking for high-end tankless or heat pump water heater installations who prioritize workmanship reliability over the lowest possible bid.
Insider tip
Ask specifically about current heat pump and tankless rebates, as reviews suggest they are very knowledgeable about navigating these savings.
Platform Scores
(1,156)
(195)
A+
21 yrs
78%
Diamond Certified
24/7 Emergency
21 years in business, specializing in residential and commercial plumbing with a focus on diagnostics and repair. Distinguished by their Diamond Certified status for 21 consecutive years, a rarity that signals consistent high-quality feedback. Best for homeowners in Santa Clara and San Mateo counties seeking verified high-quality workmanship and are willing to pay for reliable, guaranteed service.
Essential Q&A
What makes them stand out?
They hold an impressive 21-year streak of Diamond Certification, verifying high customer satisfaction through independent telephone surveys.
Who should hire them?
Homeowners who prioritize guaranteed quality and reliability over finding the absolute lowest bid.
Insider tip
Reviews suggest they are particularly responsive to urgent calls on holidays and weekends, making them a strong choice for emergencies.
Platform Scores
(12)
(257)
A+
21 yrs
Diamond Certified
24/7 Emergency
Established in 1991, this family-owned company has served Santa Clara County for over 30 years with a focus on residential and commercial plumbing. They are distinguished by 21 consecutive years of Diamond Certification, a prestigious status requiring high customer satisfaction ratings and verified license insurance. Best for homeowners who prioritize proven reliability and workmanship over the lowest possible price.
Essential Q&A
What makes them stand out?
They are a 21-year Diamond Certified company, a distinction held by very few plumbers that guarantees high customer satisfaction and verified credentials.
Who should hire them?
Homeowners in Santa Clara County looking for a long-established, family-run business with a track record of high-quality work and professionalism.
Insider tip
Reviews frequently mention the owner, Kevin Garza, and his son Adam, indicating a hands-on approach from leadership that often results in better accountability.
Platform Scores
(83)
(228)
A+
9 yrs
EPA Certified
Diamond Certified
24/7 Emergency
12 years in business, specializing in residential and commercial plumbing repairs and tankless water heaters. Maintains the prestigious Diamond Certification with over 200 verified customer surveys, distinguishing them for verified quality in a crowded market. Best for homeowners in San Mateo County who prioritize workmanship and long-term reliability over the lowest possible price.
Essential Q&A
What makes them stand out?
They hold Diamond Certification, requiring them to pass ongoing rigorous customer satisfaction surveys, a distinction few local plumbers maintain.
Who should hire them?
Homeowners who want high-end, verified workmanship and are willing to pay a premium for peace of mind and extended warranty support.
Insider tip
Ask about their extended warranties at no additional cost, which is a specific value-add mentioned in their company literature.
Platform Scores
(226)
(88)
A+
60%
61 years in business, specializing in residential plumbing and showroom sales. Key differentiator is their third-generation family ownership and exceptional longevity in the local market. Best for homeowners valuing stability and experience over the lowest price.
Essential Q&A
What makes them stand out?
A rare third-generation family business operating since 1965 with a physical parts showroom.
Who should hire them?
Homeowners who prefer established, traditional service providers and need access to specific parts or showroom advice.
Insider tip
Visit their Campbell showroom for parts advice before booking a service call if you are a DIYer.
Platform Scores
(293)
(82)
A+
6 yrs
Diamond Certified
BBB Accredited
24/7 Emergency
Established in 1996, this family-owned company specializes in residential and commercial plumbing with a focus on emergency repairs and water heater services. They are Diamond Certified for six consecutive years, distinguishing them for verified high-quality workmanship and customer satisfaction. Best for homeowners in San Jose needing reliable, same-day service for urgent plumbing issues.
Essential Q&A
What makes them stand out?
They hold the prestigious Diamond Certified award, meaning their customer satisfaction is verified by independent telephone surveys, not just online clicks.
Who should hire them?
San Jose homeowners facing urgent plumbing failures who value speed and verified reputation over the absolute lowest price.
Insider tip
Be careful not to confuse them with 'Allstar Pros' or lead-generation sites with similar names; ensure you are contacting 'Allstar Plumbing' at goallstar.com.