To supporters, the Carlsbad Desalination Plant is a historic engineering marvel. And it is a survivor, having endured six years of government permitting, from the Carlsbad City Council to the California Coastal Commission. Supporters won 14 lawsuits and appeals by environmentalists before finally breaking ground in December 2012.

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“They went through seven or eight years of hell to get here,” said Tim Quinn, executive director of the Association of California Water Agencies. “But they stuck it out. They got it done. If it succeeds, it will encourage others to try. And if it fails, it will have a chilling effect.”