You can use this water level alarm circuit anywhere as a water level indicator to detect the desired level of water for example in tanks, swimming pools or at any place where you store water. The circuit is build around a 555 timer IC which is a famous and well know IC and you can easily get it.
The circuit can be operated with any voltage from 6 volt to 15 volts. Use any speaker of 8 Ohms or 16 Ohms with 0.5 to 1 watt output ratings. 

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The circuit presented here is a project of a water level alarm circuit using 555 IC. The circuit will produce an alarm sound when the level of water will reached at your desired position. For using the circuit simply connect the two probes of the circuit at the desired level of water where you want the circuit to alert you.
Water Level Alarm Using 555 IC