Santiago Taveras, principal of DeWitt Clinton HS, installed a shower in the school for his personal use, The Post has learned.

But it’s OK, says the Department of Education — he installed it himself.

“Principal Taveras purchased the materials for the shower with his own funds,” DOE officials said, adding that an investigation “did not substantiate any wrongdoing.”

Asked whether a contractor was hired, officials said Taveras “installed it himself outside of school time.”

DOE officials said “the bathroom is open to the principal, the principal’s secretary, the APs [assistant principals], parents and guests, and students who need it for emergency reasons. Principal Taveras is not the only staff member with a key.”

But DeWitt Clinton staffers said no one except Taveras and a custodian can get in. Taveras uses it to wash up after exercising at the school in the morning, they said.

The shower was put in without a required building permit.

Responding to a complaint of illegal plumbing work at the school, city Department of Building inspectors were “unable to gain access” to the locked room on two visits last January, records show.