• MarinH2O Inc.

    Serving Marin since 1961

    Contact Us
  • Home Filters

    If your water system does not have a filter, you are a filter. Let us install a reverse osmosis home filtration system to provide you with delicious, pure drinking water. The system reduces contaminants as small as an atom. We offer environmentally preferred water filtration systems with recyclable components, reducing landfill waste and saving resources.

  • Why Hydration is Important

    Doctors recommend drinking at least eight 8-ounce glasses of water each day for optimum health. Humans lose a pint or more of water every day, just by breathing. To calculate your ideal water intake, divide your weight in half. This will give you the minimum number of ounces of water you should drink per day. For example, a person weighing 150 pounds should drink 75 ounces, or at least nine glasses per day.

  • Plumbing Remodel and Construction

    We plan, organize and design plumbing systems to your specifications for remodels or new construction. We work with your architect, contractor, and designer to achieve your esthetic and financial goals. Types of remodels: Kitchen Bathroom Commercial Sewer lateral Trenchless Our goal is to provide long-term quality and service. We never skimp on parts.

  • Service Maintenance

    We realize that plumbing emergencies require an immediate response. Your phone call will be answered by a real person, and a plumber will arrive quickly to solve and repair your plumbing problem, whether simple or complex.

  • Water Heaters

    We Perform Expert Water Heater Installation and Repair Services There are several reasons to install a water heater. Whether you are prepping your home for resale and want to increase its property value or simply want to make your family more comfortable, a water heater is an investment. With our help, you can make the […]

  • Natural Gas Lines

    Our services include natural gas line installations. Click here to learn about natural gas lines and how they work.

  • Water Storage & Reclamation

    We can install systems that safely reclaim waste water or harvest and store rainwater for efficient use in your garden. Not quite sure how gray water systems work? Check out the link below: How Gray Water Reclamation Works Why you should ration water and use gray water systems/reclamation: Mandatory water rationing in Marin likely April […]


“Marin County Plumbing, General Engineering & Water Treatment experts since 1961”


Your Professional Plumbing and Water Treatment Solution! When you need help with your Marin County home or business water systems, call us for prompt, courteous service.

About Us

MarinH2O Crew Fleet and Excavator

You may not remember my grandfather, Richard Williams. But you’ll benefit from his business philosophy. I grew up working in the company he founded over 45 years ago, and learned that old-fashioned integrity and honesty were our most important products.


Marin H2O, Inc.
40 Paul Drive
San Rafael, CA 94903
Phone: 415.479.8411
Fax: 415.472.2766


Your Professional Plumbing and Water Treatment Solution! When you need help with your Marin County home or business water systems, call us.
Contact Us


Marin H2O, Inc. 40 Paul Dr San Rafael CA 94903
(415) 479-8411
Contact Us

Hours of operation

Business Hours

Mon - Fri
Sat - Sun
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