The simplest answer is that sodium naturally occurs in water as it moves through soil and rocks. Think of it as the water taking a little souvenir from the earth—just a trace, really.
But here’s where it gets sneaky: some municipalities add sodium compounds (like sodium fluoride or sodium hypochlorite) during treatment. Yeah, that’s the stuff they use to fight bacteria and strengthen your teeth.
And if you live in an area with hard water, you might have a water softener at home. Those things swap calcium and magnesium for sodium ions—which can spike the levels significantly. (Just a heads up: if your water tastes a bit salty, that’s your culprit.)
So, how much sodium are we actually talking about?
A typical 8-ounce glass of tap water has around 2 to 10 milligrams of sodium. For context, a single slice of bread has about 150 mg. You’d have to drink a swimming pool’s worth to get into trouble.
But—and this is a big “but”—if you’re on a strict low-sodium diet for medical reasons, those few milligrams can add up. Especially if you’re chugging eight glasses a day.
Bottled Water Sodium Content Comparison – SDVU
I checked my city’s water report (yes, I’m that person now), and it listed exactly 8 mg per liter. That’s basically a yawn compared to a bag of chips, but still worth knowing.
