Sounds maybe like Iron in the water... or rust in the pipes? Is there any colour in the water when you first fill a glass in the morning? When you first turn on the taps? You might not be able to see it at that volume... what about a full white bathroom sink? or the bath tub? More water volume and you might see the tint in the water with a white background.
It's not very common but it does happen depending on where you live, I think.
It's not very common but it does happen depending on where you live, I think.