LA County dams and reservoirs collected 120 billion gallons of stormwater during the 2025-2026 storm season.

In December, Southern California experienced remarkable rainfall, culminating in a wet start to the New Year with storms soaking the annual Rose Parade in Pasadena. For water supply managers in Los Angeles County, this precipitation is more than just an inconvenience; it represents a pivotal opportunity to bolster local water reserves.

Local rain contributes significantly to the region’s drinking water supply, accounting for approximately 40%. In light of this, officials at the Los Angeles County Public Works Department have been proactive in capturing rainwater for future use, ensuring it is stored in reservoirs and groundwater basins. As the 2025-2026 storm season concluded—spanning early October to mid-April—the county reported a substantial increase in captured rainfall, amassing 120.3 billion gallons. This figure represents a staggering increase from the 11.9 billion gallons recorded in the previous season, showcasing a successful year for stormwater management.

The volume of stormwater captured is sufficient to sustain the needs of approximately 3 million residents for an entire year. Bruce Reznik, executive director of L.A. Waterkeeper, a nonprofit focused on water conservation, emphasized the significance of this achievement, attributing it to both the county’s historical investment in stormwater management infrastructure and the fortuitous weather patterns of the season.

Mark Pestrella, director of L.A. County Public Works, indicated that the rainfall this season reflected the effectiveness of the county’s flood control systems and collaborative stormwater management efforts. The downtown Los Angeles area recorded 16.9 inches of rain—about 110% of its annual average—compared to only 6.6 inches in the previous season. As a result, stormwater capture exceeded national averages, marking an impressive 185%.

These advancements have not gone unnoticed by local officials. Third District Supervisor Lindsey Horvath cited the potential for enhanced stormwater capture as a critical solution to strengthen the county’s water supply, advocating for reduced reliance on imported water and fostering community resilience amidst climate change.

Despite this successful year, Reznik cautioned that the county must remain vigilant about water conservation strategies, as a daunting 60% of local water still relies on imports from distant sources like the Colorado River and Sierra Nevada. Growing challenges due to climate change and erratic rainfall patterns further underscore the necessity of developing and implementing robust stormwater capture initiatives.

Efforts to improve stormwater management should not only focus on larger infrastructure projects but must also include smaller-scale initiatives across neighborhoods to enhance urban permeability. For example, traditional hard surfaces in schoolyards and parks could be transformed into green spaces, allowing rainwater to permeate the ground more effectively. Local residents can contribute by replacing conventional lawns with drought-resistant native plantings, fostering a community ethos of sustainability.

With the potential for more rain capture in future seasons, it is vital for Los Angeles County to capitalize on its success. Continuous investment in innovative stormwater strategies is essential, particularly as climate variability presents fresh challenges. The extensive rainfall may have provided a temporary relief, but long-term water security will depend on consistent conservation and adaptive planning initiatives in a region where water scarcity is an enduring concern.

Moving forward, the emphasis on sustainable practices and infrastructure improvements could transform Los Angeles into a model for urban resilience in the face of climate challenges.

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