Major gas line rupture in Castaic prompts shelter-in-place order and I-5 closure, California
A high-pressure natural gas transmission pipeline ruptured near Ridge Route Road and Pine Crest Place in Castaic, Los Angeles County, at about 16:20 LT on December 27, 2025 (00:20 UTC on December 28), prompting a shelter-in-place advisory and a full closure of Interstate 5 until about 21:00 LT. SoCalGas confirmed its crews isolated the damaged section, stopped the leak, and reported no ignition or explosion.
Rupture at gas transmission in Castaic, California prompts shelter-in-place and I-5 closure on December 27, 2025. Image credit: KNN (stillshot)
A rupture occurred on a high-pressure natural gas transmission line near Ridge Route Road and Pine Crest Place in Castaic at approximately 16:20 LT on Saturday, December 27.
The line, operated by Southern California Gas Company (SoCalGas), runs parallel to the southbound lanes of Interstate 5. A strong natural gas odor was reported across large parts of the Santa Clarita and San Fernando valleys shortly after the incident.
Los Angeles County officials issued a shelter-in-place order at 17:40 for nearby neighborhoods, including areas around Northlake Hills Elementary School, totalling over 19 000 people. Residents were instructed to close doors, windows, and ventilation systems due to the risk of ignition and air contamination.
The advisory remained in effect for several hours and was lifted later in the evening after utility crews isolated the damaged section of pipeline.
Interstate 5 was closed in both directions between Lake Hughes Road and the Lower Crossover shortly after 17:12, with northbound traffic detoured to SR-126 and southbound to SR-138. The highway reopened around 21:00 after officials confirmed the gas release had been controlled.
BREAKING: A massive 36-inch underground natural gas pipeline rupture sent high-pressure gas spewing into the air across the Santa Clarita Valley moments ago, prompting emergency evacuations and shelter-in-place orders in the Castaic area.
— Austin Dave (@AustinDave_) December 28, 2025
The rupture was reported shortly before… pic.twitter.com/37GsIfx9fI
In an official statement, SoCalGas said its crews had safely isolated the damaged portion of the line, stopping the leak. The company confirmed there were no indications of ignition or explosion and noted that significant land movement had been observed near the break.
The cause of the rupture remains under investigation. Preliminary assessments and field reports indicate that significant ground movement occurred near the break, suggesting a possible link between recent slope instability and the pipeline failure. Authorities have not confirmed whether the rupture triggered the slide or resulted from it.
Several non-residential customers experienced service interruptions, and SoCalGas warned that residents could continue to smell natural gas in the area as remaining gas dissipates.
Los Angeles County Fire Department reported no injuries. The Los Angeles Fire Department separately clarified that odor reports in the city were linked to the Castaic rupture and posed no immediate threat.
By late evening, utility and fire crews had secured the scene, completed atmospheric monitoring, and confirmed there was no ongoing hazard to the public.
I'm a dedicated researcher, journalist, and editor at The Watchers. With over 20 years of experience in the media industry, I specialize in hard science news, focusing on extreme weather, seismic and volcanic activity, space weather, and astronomy, including near-Earth objects and planetary defense strategies. You can reach me at teo /at/ watchers.news.
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