Urgent Repair Concludes Ahead of Schedule and Under Budget
August 28, 2025
North County project highlights importance of agency’s proactive maintenance
Today the San Diego County Water Authority formally concluded urgent pipeline repairs in North County that protected a retirement community from a potential emergency, avoided more costly repairs, and ensured critical water deliveries for the region during the height of summer.
The project, adjacent to the Rancho Monserate neighborhood in Bonsall, finished under budget and two days earlier than scheduled thanks to around-the-clock work by Water Authority crews and contractors. Quick work reduced strain on retail water agencies who take water from Pipeline 4 on the Water Authority’s Second Aqueduct.
“San Diegans expect two things from us: reliable water at a price they can afford. Getting this project done ahead of schedule and under budget underscores our commitment to being good stewards of ratepayer dollars,” said Water Authority Board Chair Nick Serrano. “We will continue to uphold our responsibility to keep water flowing reliably to homes and businesses while making common-sense cost decisions on behalf of the region — and this is proof that we are doing just that.”
Water Authority staff continuously monitor the agency’s massive pipeline system for emerging weaknesses using an array of tools to stay ahead of repairs on aging infrastructure, most of which is more than 50 years old.
In early 2025, the Water Authority’s Asset Management Program identified a 120-foot section of Pipeline 4 near the south slope of San Luis Rey Canyon, commonly referred to as Dulin Hill, where the rate of wire breaks inside the pipeline had increased significantly. Because wire breaks are an indicator of a potential pipeline failure, the agency’s operations and engineering teams quickly developed a repair plan to deploy in June before summer temperatures peaked.
Pipeline 4 is 7.5 feet in diameter, making work both challenging and expensive. In total, the June construction contract cost $1.7 million – just a fraction of the cost that would have accrued had the pipeline ruptured and threatened the nearby neighborhood and major roads. The work took 19 days to complete in June. Per agency protocol, it was presented to the Board for formal acceptance at Thursday’s Board meeting.
Repairs give the Water Authority approximately a decade to devise a long-term fix at the site.
“I’m proud that our team quickly identified and fixed a problem that would have gotten much larger had we not fixed it,” General Manager Dan Denham said. “San Diegans expect water to come out of their taps when they turn them on, and this is a small example of how the Water Authority works every day to ensure that kind of reliability.”