There is not a lot of wiggle room in 210.8
(5) Unfinished basements — for purposes of this section, unfinished basements are defined as portions or areas of the basement not intended as habitable rooms and limited to storage areas, work areas, and the like
Exception to (5): A receptacle supplying only a permanently installed fire alarm or burglar alarm system shall not be required to have ground-fault circuit-interrupter protection.
If this is a crawlspace, unfinished basement or garage, the only 120v 15/20a receptacle that gets an exception is an alarm circuit.
Even a dedicated single is not OK unless you come up with an alarm to plug in it.
You could get away with rewiring it to 240 from what I read.
I am glad I don't need to explain that to a home owner.
On the other hand this is a lot more dangerous than what we protect from in swimming pools.
..The pump stopped
...A homeowner standing in ankle deep water with a screwdriver in his hand trying to figure out why the pump isn't running.
In a perfect world there would be a dead face GFCI at the top of the steps, just feeding the sump pump. If it won't hold, you are done.
If it was indicating (noise or light) you have something.