A school district in Beverly Hills, California, was saddled with a bill of at least $11 million to plug 19 oil wells on the property of its high school, after a judge in 2017 absolved Venoco LLC - the bankrupt company that had been operating the wells - of any responsibility for clean-up because other creditors took priority.
https://www.reuters.com/article/us-usa-drilling-abandoned-specialreport/special-report-millions-of-abandoned-oil-wells-are-leaking-methane-a-climate-menace-idUSKBN23N1NL