LADWP Completed Santa Ynez Reservoir Upgrades
The department installed a new liner and cover system as part of a $14.3 million infrastructure project.
Updated on Sept. 22, 2026 in Utilities
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LADWP crews finished installing a new liner and floating cover system at the Santa Ynez Drinking Water Reservoir to secure the local supply. This work is a key component of a $14.3 million effort to replace aging infrastructure and meet federal EPA mandates.
Why it matters
The upgrades are designed to safeguard potable water quality and bring local facilities into compliance with Environmental Protection Agency requirements. These improvements ensure the continued integrity of the water distribution system serving Los Angeles residents.
The Santa Ynez project cost $14.3 million, while a separate water main improvement initiative in the area is valued at $78 million. Backup systems include a six-mile, 10-inch flexible hose network and existing reserves of nearly 5 billion gallons of water.
The players
LADWP
The Los Angeles Department of Water and Power is the municipal agency responsible for providing water and electricity to the city.
Los Angeles Board of Water and Power Commissioners
This board oversees the policy and governance of the Los Angeles Department of Water and Power.
The details
Crews replaced aging components with a modern liner and floating cover system at the Santa Ynez site. During construction, the utility maintained supply via the Upper Stone Canyon Reservoir and Westgate Trunk Line to ensure no service interruption.
Timeline
January 2026: The Board of Water and Power Commissioners approved the reservoir project.
September 2026: The facility is scheduled to begin the refilling process.
December 2026: The reservoir is targeted to return to full service.
2031: Completion of the broader Water Main Improvement Project upgrades.
Market Landscape
This project represents a broader transition toward modernizing aging utility infrastructure across the city. It positions the department to better manage municipal water assets while meeting federal EPA mandates.
Residents should expect no changes to water service reliability during the transition, as backup systems remain in place. The city-wide project ensures that long-term water quality is protected while aging infrastructure is replaced.
The takeaway
The successful upgrade at Santa Ynez demonstrates the critical nature of proactive maintenance for urban water security. Residents benefit from these long-term investments through improved water safety and regulatory compliance.
Further reading
For more on city utility operations, visit Utilities.
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