In his article, John Schwartz presents the reasoning that wastewater recycling has a public perception challenge to overcome. Which piece of evidence sufficiently supports this reason? Purifying wastewater involves a number of steps, including reverse osmosis. Los Angeles County uses recycled wastewater in irrigation and in boilers. Governor Jerry Brown has established water restrictions in California. Activists have coined the slogan "toilet to tap" to discourage the use of wastewater.