I mean possibly. Each station has a Veeder Root system that should stop any water from entering the fill pipe to begin with. Then the fuel goes through a filter in the gas pump itself which should stop even small amounts of water (I believe). When a pump is pumping super slow it’s usually the filters need replacing. That particular station has been reported before. An inspector can only check if the issue is still happening not what happened at the exact time of filling. Maybe they called immediately afterwards and had the storage tank pumped out and all the filters replaced, but that may be asking too much of that particular company/ station. All companies pay a lot of money to have both of these things checked and maintained regularly because being out of gas for a couple hours is literally thousands of dollar in profit for them. The only other thing I’ve heard that could possibly affect this is fuel was being delivered/dropped into the fuel tanks at the same time OP was pumping fuel. If there was water it could possibly be pushed around and make its way up to the fill spot at that time. Also sometimes if it’s just rained or snowed there could be a small amount of water making its way to the gas pump nozzle? But all these are very rare and wouldn’t cause 12 vehicles to go down for water. This time of year the simple answer is usually water/condensation getting into the tank from a rain or snowstorm and I’m literally basing this of if a few cars we had in the past that for whatever reason needed some dry gas from time to time, although all the other cars in the parking lot were fine.