A loss of pressure in the supply can have a siphoning effect on non-checked outlets and draw in fouled water mud, etc. hence boil water after drop or loss in your city or county systems. Code requires all water meters to have a back flow preventer installed.
I am a retired lead maintenance mechanic at a large hospital system in Atlanta. Believe me if those back flow preventers failed annual inspection they can lockout the city water supply for the entire hospital. We had bypasses with bf preventers on every water meter!
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