California-based Stone Brewing Co. is taking a huge leap towards going green. As San Diego 6 reports, the brewery debuted a very environmentally friendly pint of suds at its Liberty Station location this past Thursday. The newly debuted brew is produced with water from the city’s “pure water program,” which upon completion, will take wastewater that is destined for the ocean and instead, be put back into the city’s fresh water system.

Although some are referring to the program as “toilet to tap” water, Stone explains that this super pure water is ideal for brewing. As Stone Chief Operating Officer Pat Tiernan tells San Diego 6, “This particular water will just help us not require so much natural water to come in and give us a more reliable source, so for us to be able to re-use, that’s part of our mantra, that’s part of what we do.” The beer was well-received by beer lovers present at the event, including San Diego’s Mayor, Kevin Faulconer. The pure water system in San Diego is set to be complete by 2035 and will sustainably provide over 30% of the city’s water.