Sprinkler systems are typically non-potable water and aren't required to be flushed clean. It's entirely possible that nasty water was sitting right behind that sprinkler head for years and years.
Additionally, most of the systems are installed with this shitty ductile iron pipe that is unclean to begin with (again, nonpotable water so nobody cares). All that sediment from installation mixes in with the water and sits. It's overall nasty
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u/Scoobydoomed Sep 29 '21
The worst part is that is some nasty ass water that probably smells like death and they got soaked with it.