The 2015 Aliso Canyon gas leak is now a decade-old story but it still surfaces in buyer searches every week. The honest 2026 answer: monitoring data has been clean for years, the facility's operations have been materially restructured, and Porter Ranch home prices have returned to and exceeded 2014 baselines. This is the balanced read every buyer asks me for and rarely finds online.
What Aliso Canyon Was
The Aliso Canyon natural gas storage facility, operated by SoCalGas, sat in the hills above Porter Ranch. In October 2015, a well at the facility began leaking methane. The leak ran four months before it was sealed in February 2016 — the largest known methane release in US history.
Thousands of Porter Ranch families were temporarily relocated. Subsequent litigation produced settlements totaling over $1.8 billion. The event was a defining moment for the community.
What's Changed Since
Aliso Canyon's operations were materially restructured. The California Public Utilities Commission imposed reduced operating pressures, enhanced safety testing, and continuous methane monitoring. Several wells were permanently retired.
Air quality monitoring data published by the South Coast Air Quality Management District has shown methane and benzene levels at background ranges since 2018. The community continues to advocate for facility closure, but the day-to-day air quality picture is materially different than during the leak.
What the 2026 Real Estate Data Shows
Median home prices in Porter Ranch dipped 5–8% during 2016, recovered to 2015 baselines by 2018, and then participated in normal Southern California appreciation. May 2026 median is $1.30M — well above the pre-leak baseline.
Days on market and list-to-sale ratios have been in line with comparable NW SFV markets since 2019. The structural discount that some buyers expect is no longer there.
How Buyers Should Think About It
If you are personally uncomfortable with proximity to a gas storage facility, the rational decision is to buy elsewhere. The facility is still operating and the community continues to advocate for closure. That is a values decision, not a data decision.
If your concern is whether Porter Ranch is materially riskier than other parts of the SFV — the monitoring data and the real estate data both say no, in 2026. Property values reflect that consensus.
What to Verify If You Buy
Step 1: Pull the current AQMD air quality data for the Porter Ranch monitoring stations. SCAQMD publishes this publicly.
Step 2: Confirm the property is not on any active or pending litigation list related to the 2015 event (rare but worth checking).
Step 3: Disclose-and-verify: California's Natural Hazard Disclosure (NHD) doesn't include gas facilities explicitly, but a thoughtful seller will mention proximity. Ask in writing.
Step 4: Talk to two or three current Porter Ranch homeowners about their lived experience. The data tells one story; neighbor sentiment tells another. Both matter.
Frequently Asked Questions
Is Porter Ranch safe to live in 2026?
Based on air quality monitoring data, yes — methane and benzene levels have been at background ranges since 2018, and Aliso Canyon's operations have been materially restructured. The community continues to advocate for facility closure, which is a separate question from current air quality.
Did Porter Ranch home prices recover after Aliso Canyon?
Yes. Median prices dipped 5–8% in 2016, recovered to pre-leak baselines by 2018, and have since participated in normal Southern California appreciation. May 2026 median of $1.30M is well above any pre-leak comparable.
Is the Aliso Canyon facility still operating?
Yes, at reduced pressure and with enhanced safety and monitoring requirements imposed by the California Public Utilities Commission. Several wells have been permanently retired. Community advocacy for full closure continues.
Should I worry about methane in Porter Ranch?
Current monitoring data shows methane at background ranges since 2018. If you personally want zero proximity to a gas storage facility, buying elsewhere is the rational choice; if the question is whether ambient methane is currently elevated, the data says no.
Are there still lawsuits about Aliso Canyon?
The bulk of the $1.8B+ in settlements has been resolved. A small number of cases continue. Most current Porter Ranch homes are not party to active litigation; verify any specific property in escrow.
