With his go-to Park Slope gym out of commission over contaminated water, Mayor Bill de Blasio is still making the 11-mile schlep from Gracie Mansion to a different Brooklyn YMCA — instead of a handful of facilities that are much closer to the mayor’s residence on the Upper East Side.

“There is no vacation, you never stop exercising, let me tell you that,” de Blasio told reporters at an unrelated press conference in Harlem. “They have a wonderful facility,” he said of the Park Slope Armory YMCA.

Hizzoner has taken flak for riding gas-guzzling SUVs to the Prospect Park Y in his old stomping grounds of Brooklyn — even as he rages against Big Oil — because the trips are a waste of time and taxpayer-funded resources, including the security detail that must follow him there and wait for him.

There is no shortage of gyms on the Upper East Side, and de Blasio’s motorcade could breeze past as many as five closer YMCA facilities on a direct route from Gracie to Park Slope, a map of the club’s location shows.