I want to design a system that automatically turns off a water pump when the water tank is full. Some background and details: 1- The pump is connected to main water supply. 2- The pump should turn on with a switch (manual input) and it should stop when water tank overflows. 3- It should not turn on automatically as the water level goes down. 4- The main water supply is irregular. Therefore, I prefer to have a manual turn on.

Can some one please suggest a circuit/design to achieve this?

  • What specifically are you asking? Have you attempted to design this circuit yourself?
    – ArchonOSX
    Aug 11, 2017 at 7:31
  • Thanks. I am asking for potential ideas for the circuit.
    – A.Khalid
    Aug 11, 2017 at 10:41
  • I'm voting to close this question as off-topic because it's about designing a circuit, not home improvement.
    – mmathis
    Aug 11, 2017 at 14:21
  • A float switch will handle the shut off, some sump controllers may allow you to set this up without altering. This looks like a winner: plumbingsupply.com/emergency-high-water-shut-off-switch.html You can probably do it cheaper yourself with a microprocessor, sensor, and relay.
    – Hart CO
    Aug 11, 2017 at 15:10
  • @HartCO Thank you very much for your response.
    – A.Khalid
    Aug 16, 2017 at 15:11

1 Answer 1


What you ask is out there, in the form of residential effluence treatment (septic).

It utilizes float switches and a small analog or digital controller that automates exactly what your looking for.

Research "septic pump tank design". You're looking for a system with 3 or 4 float switches installed. Parts for these systems are available all over the world.

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