Wireless Recycled Reef Controller
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One Wire Pond Depth Sensor
Another Water Level Sensor
QProx Sensors. They make a capacitance sensor IC.
From their application notes, you can take any type of material such a piece of PVC? pipe to make it into a sensor.
I own one of their development boards, which I plan to use as a mechanical free float switch. It takes the piece of PVC? pipe. As the capacitance change from the lowering water, you can set a point to activate a pump for top off. You also set the high point to shut off the pump.
Would probably be a good sensor to look into for the level applications above to measure the sump depth.