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Maybe, if you want to make one, and don't mind it not being as good as a manufactured float switch perhaps, then look for 'water level detector' circuits. When you find an interesting one, then you could ask questions about it. Rudimentary and more complex homemade ones are basically two electrodes or copper tracks that trigger something either when water connects them to make contact or the water falls below a specific level and there is no more electrical continuity betwen the electrodes/copper tracks. Simple ones use a DC signal - the electrodes corrode 'quickly'; less simple ones use an AC signal of whatever kind from electrode to electrode to prevent them corroding so fast. It's a good idea to have a quick little read about the resistance of different types of water at the same time.
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