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This case is a real slippery slope.

A New Jersey grade school student won a $170,000 settlement after she was injured while going down a playground slide that her family claimed was too steep.

The kindergartner was sliding down the structure during recess at Griebling School in Howell Township in October 2014 when she got going too fast and suffered “significant injuries” to her hand and arm, personal injury lawyer Ciro Tufano told The Post on Wednesday.

Tufano defended the suit by saying the slide was 5 degrees steeper than federal rules allow.

“People think I’m a smarmy lawyer making something out of nothing but this was a significant injury… She suffered some scarring,” Tufano said. “It is going to affect her for the rest of her life, in one way or another.”

Tufano — who sued the school district and the city in June — argued the slide was steeper than the federal standard set in the “Handbook for Public Playground Safety.”

In it, officials set the threshold for school slides at not more than 30 degrees — but this one’s slope measured 35.2 degrees, according to the New Jersey Superior Court lawsuit, which was first reported by the Asbury Park Press.

He declined to say, logistically, how the girl’s arm was scarred by the structure.

In the suit, he claimed the school district was negligent by failing to keep the playground equipment up to safety standards. It also notes the school failed to properly supervise the children using the slide.

In August, the girl’s family agreed to a settlement with the school, according to a filing cited by Asbury Park Press.

“My hope is that something good comes from this — that a little bit of extra effort will go into taking care of playgrounds,” he said.

A rep for the school district said the slide is still standing at the site, but is not accessible to kids.

“It is not being used,” said Ronald Sanasac, the district’s assistant superintendent of business. “It’s roped off.”

He said the school’s insurance company opted for the “friendly settlement” before officials could determine whether the slide was in fact hazardous to kids.

“I’m still waiting for an inspection to determine if it should be removed,” he said.

At least one parent said the slide injury was likely an isolated incident.

“If it’s roped off, that’s good enough for me,” said Lisa Fricke, vice president of the school’s PTA who’s son has used the slide. “My guess is that it was a freak accident.”

“I’m not concerned. Kids hurt themselves, accidents happen,” she said. “I grew up on playgrounds in Manhattan that were cement with metal slides— and I survived.”