The liquid that comes off the top of settled wastewater samples is what goes back into waterways after treatment, and the solids are sent for further treatment, with the final water being clean-looking though not drinkable.
factualpending
Speaker
Laboratory technicianEvidence Quote
“The liquid that comes off the top of it, that's what goes back into the waterways, and the solids are sent for further treatment, and then that water, after it comes out of there, is this. Looks very nice and clean.”
Source
How Chicago Cleans 1.4 Billion Gallons Of Wastewater Every Day | Deep Cleaned | Insider— InsiderCreated: 8/10/2026, 10:46:36 PM
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