Water Wise Davis, a working group of Cool Davis, will host a fourth annual Greywater Showcase online via Zoom webinar on Wednesday, July 22, from 5:30pm to 7:30pm. This year’s theme is the connection between greywater and growing your own healthy food.

Leslie Crenna of EcoAssistant will present information about water reuse at the household level, the potential for greywater across our community, and the two basic types of greywater systems, plus a bit about growing artichokes in Davis with greywater. Guest panelists will share their personal experiences growing healthy food with greywater and other topics such as creating a wetland with greywater and a new app that searches for greywater elements in general plans across the state of California. Q&A and discussions will follow presentations.

Guests panelists include Catherine Brinkley, UC Davis Assistant Professor of Community and Regional Development and Paul Havemann, Steward for Stebbins Cold Canyon with the UC Davis John Muir Institute. Special guests to be announced.

Also featuring City of Davis staff to answer code questions and give update on water resources: Greg Mahoney, Chief Building Officer, and Dawn Calciano, Conservation Coordinator.

After hearing the presentations and discussions, participants will be asked: Are you a good candidate for greywater? Throw your virtual ticket into the jar to win a FREE professional consultation and 1 of 2 laundry to landscape parts kits ($75 value).

This event is FREE!

Register for the webinar today!

The maximum number of participants is 100.

Laundry greywater system parts kits have been given away at past events — a $75 value each! Each kit came with a complimentary professional consultation!

Greywater in California

In California, greywater is defined as water collected from washing machines, sinks (excluding the kitchen sink), showers, and bathtubs that can be used for landscape irrigation. Greywater systems may help reduce household water usage especially in summer by reducing the use of potable water for outdoor irrigation. City and state level code and ordinance uses a different spelling: “graywater.”

The easiest and permit free system is a “laundry to landscape” system that directs drainage water from your clothes washing machine to your landscape. The next level requires a bit more commitment of time and resources: a “branched drain” system directs drainage water from showers, bathroom sinks, and tubs to your landscape and requires a permit. Hopefully, indoor reuse systems will also be represented at the showcase.

Greywater Showcase program TBA

5:30pm Welcome and speaker introductions

5:40pm Opening remarks (special guest)

5:45pm Leslie Crenna: presentation on basics of greywater (water reuse, potential for our community, and the two types of systems) (artichoke)

6:15pm Q&A and discussion

6:30pm Panel theme: Growing healthy food with greywater (moderated)

6:35pm Catherine Brinkley: presentation, Q&A and discussion (figs and plum tree)

6:55pm Paul Havemann: presentation, Q&A and discussion (wetland)

7:15pm Raffle: Are you a good candidate for greywater? Throw your virtual ticket into the jar for a FREE professional consultation and 1 of 2 laundry to landscape parts kits.

7:20pm Last comments and wrap up

7:30pm End


Water Wise member and greywater designer Valya Mogilner makes some last minute adjustments to the laundry to landscape greywater model she created. Photo credit Johan Verink.


Register for the webinar today!

For more information, email Leslie Crenna at lesliecrenna@gmail.com. Water Wise Davis supports wise water policy, and water conservation, reuse, and capture in the City of Davis and is a working group of Cool Davis. This event is supported by the City of Davis.