Sanitary sewers (toilets, your home, etc.) and storm sewers are independent systems. Well typically. With sanitary systems, yes, there is a valve of sorts. The water in all the drain traps is your “valve.” The whole purpose of drain traps is to literally trap water to prevent sewer gas from coming into your home.
Storm sewers are just for rainwater runoff.
I’ve worked around a few sewers before, one thing that did often stand out was the smells of detergents and soaps. On a cold day in the morning, you’d get the showers and washing water, and it would be pretty warm in them too.
There would be more soaps and shower gel than crap, so they wouldn’t be all that bad.
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