If the back up is on the city/town side of the property you may be in luck, not sure how it works in your city or town, each is different when it comes to water/sewer problems. I'd guess your sump drains into the city/town main and a blockage is backing up into your basement. I'm sure if it were sewerage you'd know it. The problem is proving where the blockage is. The camera with DVD my city uses would determine exactly how far out the problem is and if it's the homeowners issue or the towns.
Nothing worse than water problems, luckily you caught it at 1'. I've gone to a few homes where the basement is flooded and the water is up to the ceiling...usually a water main break.
Best of luck
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