Our Company

ReWater® was founded in 1990 in Palo Alto to help California meet its water needs through legal greywater irrigation. In 1996 we moved to San Diego to help that city satisfy it’s one-of-a-kind federal water reuse mandate. In 2009 we moved up to Thousand Oaks to better serve Los Angeles and the entire state. We now lead the graywater irrigation industry with experience and through innovation.

ReWater tirelessly worked with the legislature, builders, architects, engineers, contractors, and landscapers to provide legal greywater irrigation systems that meet the long-term needs of homeowners, property managers, and California’s future.

Four other huge water projects delivering water to Southern California for culinary, agriculture, and landscape irrigation.
Other significant California water projects clockwise from top left: Hoover Dam, the San Joaquin River delta, the California Aqueduct, and the L.A. Aqueduct.

Time-proven systems

ReWater® systems have been in operation for over three decades. Our systems use greywater like an irrigation system is supposed to. And they back-up your irrigation programs with city water so your landscape gets watered even when you’re on vacation. Each system comes with our sophisticated but easy-to-use 5th generation controller, which can be adapted to harvest rain and/or satisfy the City of LA. Through decades of experience and innovation, our cost-effective systems feel simple while providing everything you could want.

We put everything you and your professionals need to know on our website. If you or your design team would like to know more for a specific project, please call us at (805) 716-0104.

We remove the guess work

ReWater’s three decades of R&D, design, manufacturing, permitting, plumbing, landscaping, and consulting experience removed the experimentation from legal greywater irrigation. No competitor can honestly say anything even close to that.

We know what it takes to provide you a completely viable, easy to use, easy to maintain greywater irrigation system.  And we’ll give you the price before you make any design commitments.

So, please call us at (805) 716-0104 to discuss your project!

Our Founder

Stephen Bilson, founder and CEO, ReWater® Systems

Early Adoption and Activism

Using greywater was illegal when Stephen Bilson founded ReWater® Systems in Palo Alto in 1990. After serving two years on the California Graywater Ad-Hoc Committee, in 1992 Mr. Bilson sponsored Assembly Bill #3518, which passed unanimously in both houses (almost unheard of). AB3518 resulted in our nation’s first-of-its-kind state greywater irrigation law. That law is California Water Code Section 14875 et seg.

In 1993, Steve Bilson received US Patent #5,217,323 on the greywater irrigation system that has evolved into what is known as the ReWater® System. It’s still the only commercially available greywater irrigation system in the US that is legal in all states.

In 1992-1994, he worked with virtually every local, regional, and state building safety and health protection agency in California to help write the first state greywater irrigation code for single-family systems. Since then, he’s worked with those stakeholders and others pursuant to further legislation to improve the code several times. Now included are multi-family and commercial systems. The state graywater code is now Chapter 15 of the CPC.

Mr. Bilson has also been involved in other states’ efforts to legalize greywater irrigation. He continues to warn about the failure of NSF 350-certified systems that were only approved by using “greywater” that did not include hair and lint.

Proprietary systems across the arid West

From 1990 until now, Steve Bilson and ReWater have worked only on greywater irrigation projects. Those projects range from simple home systems saving a few hundred dollars in water a year to sophisticated commercial systems saving tens of thousands of dollars in water and tens of thousands of dollars in wastewater costs per year.

For years, he was the Responsible Managing Employee for ReWater®’s landscape contractor’s license #798547 and provided hands-on supervision of numerous residential and commercial landscaping projects all using greywater.

He’s responsible for more permitted i.e. legal greywater irrigation systems in California than everyone else combined. Along the way, he’s helped clients as philosophically diverse as the Natural Resources Defense Council to the US Marine Corps and with landscapes as diverse as desert to almost tropical.

Discussing the values of greywater irrigation with home developers

Building Partnerships

Lately, this award winning innovator has been consulting for architects, engineers, and builders working on greywater-irrigated projects. Many of those systems are backed up with rain to satisfy Low Impact Development (LID) requirements. Some of these single-family and multi-family projects have been LEED Platinum or Gold certified.

If you’re a building professional, please call us to see how we can help your projects cost-effectively satisfy California’s increasingly greener rules.

Press and Trade


The Water Zone. The Toro Company.



Commercial-Scale Greywater Systems: Case Studies from Orenco Systems and ReWater

Transition United States Greywater Webinar Series


Laundry to landscape: California’s drought solution?
Reuse residential greywater
The Coast News
Contest winner flies dream flights to grow his business
Encinitas passes graywater ordinance


On-site Reuse of Graywater and Stormwater: An Assessment of Risks, Costs, and Benefts


American Society of Plumbing Engineers Annual Trade Show and Seminar


Gray water gardening: Best practices
Water the Lawn With Your Saturday Night Bath
Two-Year Permit Approval Nightmare Finally Ends For Santa Monica Resident
ePlan: A help or a hindrance?
Water Use Efficiency and Jobs

When Gray Equals Green


Gray matters; Water reuse systems
Irrigation and Green Industry
Greywater: Legal Liability or Untapped Resource?


Design and installation of graywater systems
San Diego People Start Using Gray Water as Rationing Looms
Is Graywater in Your Future?
Gray Water Flows Green


Kill Your Plumbing
Legalizing Graywater
Toro Irrigation Set To Host 2008 Watersmart Symposium
Graywater systems recycle bath, laundry water
Share a bath, save a lawn
Legal Greywater Class by Steve Bilson of ReWater® in Costa Mesa


The Dirty Water Underground
Greywater Guerillas


Water Reuse Rushes Ahead


From graywater, green landscapes grow
Irrigate With Household Graywater


Desert Report


Imperial Irrigation District Special Board Meeting


Otay Water District Board of Directors Meeting


City of Oceanside City Council Meeting


Pollution Prevention Not Complete without Graywater
The color gray—Regulations abound for uses of gray water
Inventive entrepreneurs—A wealth of modern-day Edisons call the Palo Alto area home