Coronado wants to stop using drinkable water to irrigate its municipal golf course. And it is willing to spend millions to do that. On Tuesday, the City Council asked staff to move forward with a proposal to build a $24 million sewage treatment facility on the Coronado Golf Course. Between debt payments and maintenance and operating costs, the plant will operate at a deficit for at least the first 14 years of operation and won’t break even for 30 or 35 years.