What's the Name of That Book??? discussion

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SOLVED: Children's/YA
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SOLVED. Children’s/YA fiction - Dystopian world where words and language is restricted. [s]
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(Spoilers:) At the end it is revealed that the head person wants to restrict language with the goal of eliminating it completely in the near future. He wants people to communicate with only grunts and no verbal language/words. I think at the end there is some thing with a water tank? Maybe he gets shoved in??
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I read this book a few years ago (probably sometime in between 2017 and 2019)