Start with a simple look. Clear water is a good sign, but it’s not a guarantee. Murky, green, or slimy water often means algae are throwing a party—and not the fun kind.
If you spot foam that looks like leftover bubble bath, that’s a red flag. Natural foam is usually a light brown and disappears quickly; synthetic foam sits there like a stubborn stain.
Watch out for a colored sheen on the surface—like a rainbow you’d see on an oily puddle. That’s not a prize-winning painting; it’s likely petroleum or chemicals.
Your Nose Knows Best
Now, take a very careful sniff. Clean water usually smells like… well, almost nothing. Maybe a faint earthy scent from minerals.
If you get a whiff of rotten eggs, you’re smelling hydrogen sulfide—a definite sign of sewage or rotting organic waste. Don’t hang around for a second sniff.
A chemical, gasoline, or bleach odor is a dead giveaway of pollution. Trust your nose: it’s your built-in alarm system, and it’s usually right.
