Sometimes ones in the city do. But like, why not all sewers? Do the good ones have valves that hold all the poop and pee back?
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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.
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