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MMWD Blog: Think Blue Marin

Welcome to our blog! Written by staff at MMWD, “Think Blue Marin” explores all things water in south and central Marin—water supplies, conservation, new projects, watershed management, and more.

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Aug 30

What Can You Do?

Posted on August 30, 2016 at 11:42 AM by Ann Vallee

by Dan Carney, Water Conservation Manager

Some things are out of our control—rain, for instance. But the way you use water is totally up to you. Did you know that landscape plants will need 20% less water in September compared to August, and 40% less in October? It’s true! The autumnal equinox on September 22 marks a major shift in evapotranspiration rates (a measure of how much water evaporates from the soil and transpires through plants' leaves). In water conservation lingo, these are the "shoulder months" when plant water demand drops significantly as the days grow shorter.

So what does this mean for you? If you’ve been watering your landscape three days a week in August, for example, switch to watering two days a week between now and October and realize a 33% water savings—very good for the reservoirs and your pocketbook, too.

Maybe this water year (July 1 – June 30) the reservoirs will fill again, and then again, maybe not. Marin is fortunate that our seven reservoirs filled in the past two years, but since MMWD only has a two-year water supply even when the reservoirs fill, water conservation has to be a permanent way of life.

MMWD staff can help you get ready for this fall season. To book a free water survey, get rebates, and for assistance with your water-wise landscape, please check out the many services available to you today by visiting, or give us a call at 415-945-1520.


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