Yes, it is entirely normal and safe for a submersible sump pump to remain totally submerged in water while sitting idle. Submersible sump pump motors are manufactured inside waterproof, hermetically sealed cast-iron or heavy-duty plastic housings specifically designed to withstand constant water immersion without electrical short-circuits. However, if the pump is completely submerged and the water level remains high without the motor turning on, it indicates either a stuck float switch, a disconnected power source, or a failed motor. Verification: Lift the float switch manually to confirm whether the fully submerged motor activates when triggered.
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