The City of Santa Cruz Water Department announced Tuesday the replacement of a major water pipeline, that diverts water from North Coast streams, has been completed. Less than a year after the $5 million project began, 520 feet of 1960s era steel water lines have been replaced by new ductile iron pipeline. Majors, Laguna, and Liddell creeks feed into the newly-upgraded line. Water from those streams are then delivered to the the Graham Hill Water Treatment Plant, before arriving at customers’ taps. … For a length of 220 feet, the water pipeline runs beneath the San Lorenzo River. That made the project technically challenging.