can you run a water softener into a sewer cleanout?
Not directly, needs an air gap.
Welcome to the forum, Eric enjoy.
Nowhere is a tapped fitting like that allowed. Recommend correction by a licensed plumber.
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Just don’t drink the water.
No, it is not right.
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You guys are just picky, it was like this for 10 years without any side effects.
…that we know of. 
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