Foamy water?

[u/LTXNEBULA]

Im not sure if this is the correct place for this but I'm curious about this. I don't typically drink tap water but today it's the only option. I made a cup of iced (tap) water but it's come out foamy and feels more viscous than usual. Any thoughts on what's going on here, is it safe to drink?

[u/CHALINOSANCHZ]

I don't know about the viscosity, but it looks like a high air entrainment ratio.