A shuttered San Onofre Nuclear Generating Station in Southern California discharged about 5,000 gallons of wastewater into a Unit 2 storm drain that leads to the Pacific Ocean after a planned transfer ran past its intended end time on Sept. 23, 2026. The water, described as mostly groundwater with some concrete-cutting slurry, exceeded the site’s permitted pH limits and contained tritium at about 3,000 picoCuries per liter. Southern California Edison notified the Nuclear Regulatory Commission and state water regulators the next day, collected samples at three locations, and reported preliminary results that it does not believe the release poses a threat to ocean water quality. Normal treated discharges are routed through an underwater pipe ending at a diffuser roughly 1.1 miles offshore with prior public notice.
San Onofre ceased power generation in 2013 and now stores roughly 3.6 million pounds of spent nuclear fuel in 123 sealed canisters - 73 in a Holtec underground system and 50 in Transnuclear horizontal modules - on Navy-owned land near San Clemente. Southern California Edison operates the site and owns about 78 percent, with San Diego Gas & Electric and the city of Riverside holding the remainder. The facility previously supplied a significant share of regional electricity when active; the incident raises questions about wastewater controls and oversight during decommissioning and storage operations.
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