California Water History


California's water professionals are responding to the State's declining water supplies and erratic weather patterns with a new philosophy - One Water.

Drinking water, wastewater and stormwater traditionally were managed separately. Today we view them all as one water. Across the State communities are planning projects that integrate infrastructure across the water cycle. We're breaking down barriers between different municipal departments and asking regulators for flexibility so we can build multi-use water projects.

We believe all water has value and should be managed in a sustainable, inclusive and integrated way. 

We call this perspective One Water. We can provide plenty of water for a robust and healthy California for generations to come.

This page has a wealth of info about California's One Water. Read, share and contribute, we want this to be a resource for all Californians!

Featured video: What is One Water?

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One Water California Posts

CA-NV AWWA and CWEA Sign Agreement to Work Together on the Future of Operator Certification

June 7, 2018

The California-Nevada Section of the American Water Works Association (CA-NV AWWA) and California Water Environment Association (CWEA) have signed a …

One Water Roundtable Video: How do we afford water system upgrades?

January 24, 2018

CWEA Roundtable: How can we afford water system upgrades? A water Q&A with three of California’s top clean water leaders …

Announcing the Water Equity Clearinghouse

September 29, 2017

From US Water Alliance We are pleased to announce the release of the Water Equity Clearinghouse, an online database that showcases …

WE&RF Unveils Report on Pre-Treatment Standards for IPR/DPR

August 5, 2017

WE&RF released a new research report on pretreatment standards for agencies interested in adding or expanding their water reuse facilities. …

Water Resiliency Leadership: One Water Solutions – Workshop Recap

July 17, 2017

By Elaine Connors, Contributing Writer and Holly Tichenor, Water Systems Consulting, Inc. Imagine being the main representative of your communities’ …

Monterey WPCA Changes Name to Monterey One Water

July 17, 2017

  From Monterey One Water…. Monterey Regional Water Pollution Control Agency is proposing and recommending to its members that the …

California Prepares for Direct Potable Reuse of Wastewater

May 2, 2017

A state bill aims to create standards for direct potable reuse by the end of 2021 California’s multiyear drought was …

Trussell Technologies Explains the 4Rs in Potable Reuse

March 16, 2017

Reliability | Redundancy | Robustness | Resilience Trussell Technologies, a family run environmental engineering firm focused on process and water quality was recently cited …

AC17 Topics: What is the One Water Philosophy?

February 22, 2017

Radhika Fox, CEO of the US Water Alliance and based in San Francisco, will be the facilitator for our AC17 …

CWEA Member Adel Hagekhalil Discusses the Los Angeles One Water LA 2040 Plan with Engineering News-Record

November 4, 2016

Story by Scott Blair of Engineering News Record Years of drought and other ever-present threats to infrastructure resiliency have spurred …