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MarkJohnson

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Water drains don't fix sewage backup. To clear up sewage back ups, add more sewage plants to processes it.

Bigger plants process more and need fewer built.

There are inland sewage plants that send sewage into the ground, from one of the purchased DLC, instead of into the rivers. If you need that.
 

Ragga Muffin

Captain
Dec 24, 2019
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Eco water (large) plants are the only plants that dont produce polution
Nope you have to build more drains until you hit milestone that gives something bigger
You really should only need 3/4 before this happens