toilet to tap
n.— «Atwater plans to ramp up efforts to recycle wastewater for potable use, as Orange County has already done. (This process is sometimes disparagingly referred to as “toilet to tap.” In fact, it produces water so pure that, untreated, it corrodes metal pipes.)» —“Channeling Mulholland” Los Angeles Times Feb. 25, 20008. (source: Double-Tongued Dictionary)
Further reading
As we’ve noted, in California’s Orange County, to birdie means “to drink from a bottle without touching it with one’s lips.” Elsewhere this germ-avoidant act is also called airsipping, airing, baby birding. In parts of the UK, you might sky a drink...
A retronym is a word coined to distinguish something new from an older, more generic version, such as electric guitar or clock radio. A couple of new retronyms are fine water, or “unprocessed water that reflects a region’s terroir” and water...