With a 56,000-gallon underground cistern, the Bullitt Center will harvest Seattle’s rainwater—of which there should be plenty—and use it for all non-drinking water needs. Building owners want to use it for drinking water too, but that will only come if the state changes its codes for potable water. As it stands, the water is filtered and UV-purified, all on site, but approval for using rainwater for drinking water would require chlorination. Still, a “pathway to approval has been identified, so we expect approval,” says the center’s spokesperson.
Hayes says that while the building will still connect to the city’s water supply as a back-up, the plan is to use “rainwater in our coffee, our dishwaters, our showers and for everything else. We will filter the resulting gray water and infiltrate it into rain gardens full of vegetation in front of our building. We will make no use of Seattle public water supply.”
Courtesy of Bullitt Center