A Brooklyn businesswoman says City Councilman Jumaane Williams has yet to return all of the campaign donations she gave him in April that exceeded legal limits.

Connie Cincotta, who owns a multimillion-dollar masonry business, told The Post on Tuesday that the candidate for lieutenant governor had assured her at the time that each of her three companies could legally donate up to $20,000 apiece, so she wrote him a trio of checks totaling $50,000.

After The Post ran a story on the illegal contributions last July, Williams told her he was mistaken and that a corporation can’t donate more than $5,000. He then promised to return the rest of the funds.

But Cincotta said Williams’ camp had since come up with a flurry of flimsy excuses to delay payment, and now she fears running afoul of the law.

“I’m ethical to a fault, and I pride myself on my reputation,” said Cincotta, who owns Glenwood Mason Supply, Ferguson Hauling Corp. and Glenwood Masonry in East Flatbush.

“To have it suggested that I was involved in anything improper is devastating to me.”

A lawyer for Williams, Arthur Schwartz, had a secretary hand-deliver a $10,000 check to Cincotta’s lawyer Tuesday, shortly after hearing that The Post was looking into her claims.

Schwartz insisted that the timing had nothing to do with a reporter’s inquiries.

Earlier Tuesday, Cincotta’s attorney, John Arlia, showed up at Schwartz’s office but the lawyer refused to see him.

Schwartz said he was busy preparing for three arguments in the appellate division on election cases and couldn’t see him.

“He showed up in my office without an appointment,” he explained to The Post. “I called him as soon as I walked out of the courtroom because I knew I was being impolite.”

Arlia resorted to the personal visit after Schwartz allegedly assured him a week and a half ago that the payment was in the mail. It never arrived.

Williams called Cincotta on Tuesday and finally agreed to pay her back in installments.

“I was very disappointed to hear it was going to come in dribs and drabs,” she said.

Still, Cincotta said she hasn’t written Williams off just yet.

“I’m a glass-half-full girl, so if Jumaane makes this right, I would definitely consider supporting him in the future,” she said.