The claim that water is tasteless is technically true and practically false. Distilled water in a clean glass is close to tasteless — flat, neutral, the absence of flavor. Every other kind of water has a taste, even if you've never noticed it. Tap water tastes like the municipality that treated it. Filtered water tastes like the filter. Mineral water tastes like the salt content. And spring water tastes like the rock formation the water flowed through.

Most people who switch from one kind of water to another don't notice the difference for the first few days. Then they notice it a lot. The mineral profile of spring water is what makes it taste like water — actual water, the way the human palate recognizes it. Once you've calibrated to it, going back to flat filtered water feels like the absence of something.

Spring water's taste comes from the dissolved minerals it picked up as it moved through rock. Calcium adds smoothness. Magnesium adds crispness. Potassium and bicarbonate add a slight sweetness. Sodium adds a faint saltiness. Silica adds body without a distinct flavor. The ratio of these minerals varies by source — Opal Springs in Oregon is silica-heavy with a soft minerality, Blue Spring in Alabama has more calcium and magnesium with a crisper bite — but the presence of them is what gives spring water its character.

This isn't subtle flavor. In a side-by-side tasting — same glass, same temperature, spring water next to filtered water — most people pick the spring water immediately. The difference is most apparent at cool temperatures (40–55°F), where the mineral balance is most expressive. At room temperature, the difference compresses; this is why spring water is best served cold.

The minerals also interact with the palate's taste receptors directly. Calcium activates certain receptors in the mouth that signal 'smooth.' Magnesium activates others that signal 'fresh.' Sodium activates salty receptors even at low concentrations. The water isn't just wet — it's communicating a flavor profile to your brain, and that profile is recognizable across cultures and palates.

Spring water in plastic doesn't taste the same as spring water in glass. This is well-documented in blind taste tests and has both a chemical and a perceptual explanation. Chemically, plastic — even BPA-free — sheds microplastic particles into the water over time, especially when stored warm or for long periods. The shedding is at very low levels but it affects taste. Perceptually, the human brain associates plastic with low-quality water and glass with high-quality water, and that association modulates the perceived taste even when the chemistry is controlled.

Glass is inert. It doesn't shed anything into the water. It doesn't absorb flavors from previous contents. It doesn't carry the taste of the bottle into the drink. A 2.5 gallon glass jug that has been used 50 times and is on its 51st fill of spring water delivers the same water as a brand-new jug — the vessel doesn't become part of the recipe the way plastic does.

Glass also handles temperature better. A glass jug keeps cold water colder longer than a plastic jug of equivalent thickness, because glass is a slightly better insulator. The water arrives at the table colder and stays colder through service. Cold mineral water tastes better than warm mineral water — the cold suppresses the perception of any mineral edge and lets the smoother notes come through.

Not all spring water is created equal. The FDA regulates the term — it has to come from a verifiable underground source — but the enforcement is inconsistent and the marketing can be misleading. Here's what to look for.

A named source. The label should tell you which spring the water came from. 'Spring water from a protected source' is vague; 'Opal Springs, Oregon' is verifiable. A company that won't name its source is hiding something.

Annual third-party testing. For the full panel — microplastics, PFAS, glyphosate, VOCs, radioactive isotopes, heavy metals. Not just a generic 'water quality' PDF. The lab report should be specific to the source and dated within the last 12 months.

Mineral profile disclosure. The label or website should list the dissolved mineral content. If a company won't show you the numbers, the water is probably less mineral-rich than they're implying.

Glass or otherwise non-leaching packaging. If the water comes in plastic, the contamination story has already begun. Glass is the only common material that doesn't interact with the water over time.

A refill model. Return-and-refill glass jugs are the most sustainable packaging. Single-use glass or plastic bottles are worse than refillable glass on every environmental metric.