New water supplies in the western United States are likely to come from a panoply of non-traditional sources, including storm water capture, waste water recycling, desalination, infrastructure efficiency improvements, and other conservation measures. One potential new water source for municipalities is contaminated groundwater requiring environmental remediation, that, but for its low quality, could be used as water supply. Exploring this option is especially appealing in water stressed regions, such as much of the western United States. For example, in southern California, the Metropolitan Water District supports “[r]ecovering degraded groundwater supplies for municipal use” as part of its Local Resources Program.