What is this mess?

Holmes Run at Rose Lane Park in Annandale is bright orange. Is it mud or pollution? I’ve seen muddy streams before but not like this. It is coming out of the storm drain.
Holmes Run at Rose Lane Park in Annandale is bright orange. Is it mud or pollution? I’ve seen muddy streams before but not like this. It is coming out of the storm drain.
WOW. thats gross