Yes, having a very small, shallow pool of clean water sitting inside the central sump basin and filter well at the bottom of a dishwasher is completely normal and intended by design. This small residual water layer keeps the rubber pump seals moist and pliable between wash cycles, preventing them from drying out, cracking, and leaking. However, standing water that fills the entire bottom tub floor or contains dirty food sludge is abnormal. You can troubleshoot standing water easily. You can verify normal appliance function when observing a minimal, clean water level restricted strictly to the filter well confirms that your dishwasher's internal drainage system is operating correctly.
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