The check’s in the mail.

Small-home owners can expect a one-time $183 rebate on their water bills “very soon,” city officials said Wednesday after the state Court of Appeals approved a payback totaling $121 million.

Mayor de Blasio had proposed the rebate in April 2016, more than a year before his re-election.

But landlords of large buildings sued, charging the city was discriminating against them by limiting the refunds to one-, two- and three-family homeowners.

The landlords, represented by the Rent Stabilization Association, won in two lower courts — but the state’s highest court sided with the mayor on Tuesday.

De Blasio announced the rebate last year after saying the city would forgo $122 million in rent payments from the NYC Water Board.

Critics have charged for years that the rent was a ripoff of ratepayers.

“The bottom line is people were paying for something other than water and it never made sense,” the mayor said at a press conference in Brooklyn.

“This was a big, long fight but it was a fight that was worthwhile because it’s something that will now show people that what they see is what they get.”