Responses to that question are summarized in Table 2. A total of 49 respondents, or 8.4 percent of all respondents, indicated they reuse some of their graywater. Reuse rates by service areas vary considerably, from less than 2 percent to 25 percent. Some of the variability is probably due to the relatively small numbers involved. Nevertheless, some of the differences are statistically significant.
Service areas break down into three groups.
Green Valley, Metro, and Oro Valley all show less than 4 percent reusing graywater. These are all relatively affluent areas with relatively new, high-value housing. Relatively few homes are on septic tanks. By contrast, Flowing Wells, Marana, Ray, and Tucson Water all show much higher graywater reuse rates of between 13 and 16 percent. Differences among the graywater reuse rates of survey respondents in these four service areas are statistically insignificant.