Top-Rated North Bay Plumbers
3 vetted contractors, thoroughly researched and ranked
Last Updated: January 25, 2026
Our Top Pick
Mason Plumbing
License #817803 · Verified via CSLB
A Diamond Certified, family-run business that combines the accountability of third-party verification with the personal care of a 'mom-and-pop' shop.
Platform Scores
(10)
(85)
A+
9 yrs
Diamond Certified
Over 20 years in business, specializing in residential maintenance, tankless water heaters, and sewer inspections. Distinguishes itself as a Diamond Certified 'mom-and-pop' company with a verified track record of high-quality, personal service. Best for Marin County homeowners valuing integrity, long-term relationships, and reliable workmanship over lowest-bid pricing.
Essential Q&A
What makes them stand out?
A Diamond Certified, family-run business that combines the accountability of third-party verification with the personal care of a 'mom-and-pop' shop.
Who should hire them?
Homeowners in Marin County who want a plumber they can trust for decades, prioritizing communication and cleanliness.
Insider tip
They offer a 2-year labor warranty on installations, which is double the industry standard—be sure to ask about this for new equipment installs.
Platform Scores
(28)
(91)
A+
24 yrs
80%
Diamond Certified
Backflow Prevention Certified
Insinkerator Authorized
Kohler Authorized
24/7 Emergency
37 years in business, specializing in leak detection, water heaters, and complex repairs in Marin County. Distinguished by 24 consecutive years of Diamond Certified status and a reputation for exceptional workmanship, though independent ratings note higher-than-average pricing. Best for homeowners prioritizing guaranteed quality and long-term reliability over low cost.
Essential Q&A
What makes them stand out?
They hold one of the longest consecutive Diamond Certified statuses (24 years) in the region, verifying sustained high quality over decades.
Who should hire them?
Homeowners who want a 'one-and-done' solution for complex issues and are willing to pay a premium for verified expertise.
Insider tip
They charge for travel time and have a minimum labor charge, so grouping multiple small repairs into one visit is the most cost-effective strategy.
Platform Scores
(11)
(98)
A+
22 yrs
Diamond Certified
Green Plumber Certified
Rinnai Authorized
Navien Authorized
24/7 Emergency
Serving Marin County since 1978, Amesos Plumbing specializes in residential plumbing, radiant heating, and water heater solutions. Reviews consistently highlight their exceptional technical expertise and long-standing reputation for doing the job right the first time, though at a premium price point. Best for homeowners who prioritize quality and reliability over the lowest bid.
Essential Q&A
What makes them stand out?
They are one of the few Marin plumbers with deep expertise in radiant heating systems and Eichler home plumbing quirks.
Who should hire them?
Homeowners with complex systems (like radiant heat) or those who want a 'white glove' experience and are willing to pay for it.
Insider tip
Ask specifically about their tankless water heater maintenance plans, as they are often praised for extending the life of these units.