[ChildOfThe60s]

The "tea color" is [usually] due to natural processes - like decaying vegetation in/under the water source -- producing tannic acids

Which is great for you to emerse yourself in if you have a sunburn.

The lake at Moss Park in Orlando looks like someone filled it with Lipton tea because of the tannic acids. It was like that 25 years ago when I swam in it. Very common in Florida.

[Wings-n-Wind]

I visited in the Okefenokee a few years back... (beofre it burned down - LOL)... thousands of acres of swamp/lakes/canal looks like tea...