Question

treated sewage water is a possible alternative source of drinking water, especially in very dry regions. how can treated sewage water possibly be used as drinking water? the treated sewage is secretly mixed nightly with a citys drinking water and no one knows about it. the treated sewage is pumped directly back into the drinking water pipes for homes and businesses. the treated sewage water is returned to the drinking water treatment plant and carefully cleaned.

Explanation:

This is a safe and regulated method. Mixing secretly or pumping directly is unethical and unsafe.

Answer:

The treated sewage water is returned to the drinking water treatment plant and carefully cleaned.