DIY & Crafts ruling
Can plaster go down the drain?
It hardens, settles or coats. Your drain would prefer none of those verbs.
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Sink or drainNo
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Garbage disposalNo
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ToiletNo
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Septic systemNo
01
Why the pipe objects
Plaster sets hard and can cure inside a trap or pipe even when the mixture initially looks thin.
02
Do this instead
Let leftovers harden in a disposable container and follow local construction-waste rules.
03
Already did it?
Stop running water; more water may carry the material deeper. Scoop or wipe up what remains and call a plumber if a meaningful amount entered the line.