Total Dissolved Solids Explained

That "TDS" number on a water bottle or test strip doesn't get explained very often. Here's what it actually means.

What TDS Actually Is

TDS stands for total dissolved solids — everything dissolved in the water that isn't H2O itself.

How It's Measured

TDS is measured in parts per million, or ppm — a simple meter can give you a reading in seconds.

What Contributes to It

Minerals like calcium and magnesium, salts, and trace organic matter all add up to your TDS number.

Typical Ranges

Most drinking water falls under 500 ppm — below 300 ppm is generally considered great tasting water.

Not the Whole Picture

A low TDS doesn't automatically mean safer, and a higher TDS doesn't automatically mean unsafe — it's one piece of the quality puzzle.

Hydration Tip of the Day

TDS is a useful snapshot, but pair it with real testing and standards — not just a number on a meter.

Did You Know?

TDS is measured in parts per million (ppm), and most drinking water in Canada falls well under 500 ppm.

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