Environmental Protection Agency (EPA) officials have accumulated at least $6.3 billion in more than 1,300 obscure spending accounts akin to slush funds that are essentially beyond congressional, media and public scrutiny. The accounts – which were created through EPA’s Superfund program – are not technically secret because the agency officially acknowledges their existence. But getting concrete details about deposits and expenditures is extremely difficult. The EPA deposited more than $6.3 billion into an estimated 1,308 special accounts between 1990 and 2015, according to the agency’s website, and has spent more than half of the total. The agency doesn’t publicly report...