August 15, 2022 | 5:18pm

Tsk, tsk, Tisch!

The Suffolk County Water Authority has published a list of the Hamptons’ biggest water wasters — and readers will be stunned to learn a number of billionaires are on it, with James Tisch near the top.

While the average home uses 130,000 gallons of water a year, the Southampton mansion belonging to the president of Loews Corp. gulped down seven million gallons last year.

Other aquatic offenders include media mogul James “Sprinkelstein” Finkelstein at four million and real estate guru Robert “The Tub Man” Taubman (we assume he takes a lot of baths) at six million.

Joann Richter — the wife of Oscar-winning Hollywood screenwriter Akiva Goldsman, who penned “A Beautiful Mind” and “Cinderella Man” — also got dunked for her nine million gallon guzzle.

Sun Capital Partners co-founder Marc Leder — known as the “Hugh Hefner of the Hamptons” for throwing over-the-top parties at his $20 million, 8,000-square-foot mansion — downed seven million gallons. (In 2011, Page Six reported that during one party, “guests cavorted nude in the pool and performed sex acts, scantily dressed Russians danced on platforms and men twirled lit torches to a booming techno beat.”)

Marc LederMarc Leder’s massive property sucks up almost seven million gallons of water.Getty Images for Gabrielle's Ang

Coming in with five million gallons is Louise Blouin, who formerly ran an art media empire that included “Art + Auction” and “Modern Painter.” The $63 million home known as “La Dune” was in bankruptcy court in May.

The list appeared in local media Sag Harbor Express and the East Hampton Star, which notes, “While estates with sprawling, meticulously manicured and intricately landscaped grounds are certainly thirsty, the difference between a few million gallons and the demands of super users is almost always geothermal heating and cooling systems in large mansions.”  

These whales sure do like their water.

Louise BlouinFormer art world publisher Louise Blouin’s estate used almost six million gallons.Getty Images

Meanwhile, the Suffolk County Water Authority has published a Stage 1 Water Emergency Alert in the Towns of Southampton, Southold, East Hampton and Shelter Island.

The water services company is asking people to curb their water usage by stopping irrigation at certain hours and shortening shower time “to ensure that there is sufficient water for firefighting and other emergency purposes.”