Wow: Mayor de Blasio’s ferry system not only requires insane levels of subsidies, it also disproportionately serves higher-income New Yorkers. Take that, Tale of Two New Yorks.

As Nolan Hicks reported in Monday’s Post, 45 percent of NYC Ferry’s ridership comes from the East River route — and six of its seven stops are in higher-income ’hoods, four of them with average incomes twice the city average.

In all, 12 of the system’s 19 stops are in higher-income neighborhoods, seven above the double-the-average line.

It’s hard to see how this $582 million a year in public funds is helping with de Blasio’s goal of making New York “the fairest big city in America.”

This serve-the-rich aspect is almost intrinsic to a ferry service, because waterfront property regularly makes for luxury housing. It’s why areas like Dumbo (once freed of outdated zoning) naturally become prime gentrification targets.

That doesn’t mean banning ferries, but it does argue against the nearly $11-a-ride subsidies required to make tickets cost the same as the base subway fare. Especially when most ferry riders are on pleasure trips, not commuting.

Count this as yet another of de Blasio’s big-but-bad ideas.