Tap vs bottled water: which is actually better?

Millions of people pay a premium for bottled water because they assume it’s safer. Sometimes it is. Usually it isn’t. Here’s an honest comparison.

Who regulates what

In the U.S., tap water from public systems is regulated by the EPA under the Safe Drinking Water Act. Utilities must test frequently and publish the results every year in a Consumer Confidence Report.

Bottled water is regulated by the FDA as a food. FDA standards for bottled water generally mirror EPA limits, but bottlers aren’t required to publish an annual report to consumers the way utilities are, and testing frequency rules differ. In Canada, bottled water falls under the Food and Drugs Act and Health Canada’s regulations.

A significant share of bottled water is municipal tap water that’s been further filtered — check the label for “from a municipal source” or “purified water.”

Safety, compared honestly

	Tap water	Bottled water
Testing transparency	Annual public report required	Varies by brand; often only on request
Disinfection residual	Yes (chlorine/chloramine protects in pipes)	No
Biggest risk	Your own plumbing (lead), local contamination events	Storage (heat, long shelf life), microplastics
Microplastics	Present at lower levels in many studies	Often detected, sometimes at higher levels

The truth is that your own plumbing is the biggest variable for tap water. If your home has lead risk, a certified filter at the tap solves that for a fraction of the cost of bottled water.

Cost

Tap water typically costs less than a cent per litre. Bottled water in single-serve bottles often costs 100 to 1,000 times more. A family of four drinking 1.5 litres each per day from bottles can easily spend well over $1,000 a year. Run your own numbers in the bottled vs tap calculator.

Taste

Most taste complaints about tap water come from chlorine or chloramine, which a simple NSF/ANSI 42 carbon filter removes. Chilling water also reduces chlorine taste. In blind taste tests, people often can’t tell good tap water from premium bottled water.

When bottled water makes sense

• During a boil-water advisory or “do not drink” notice.
• When your tap has a confirmed problem that isn’t yet filtered (e.g. high nitrate with an infant at home).
• During travel where tap water isn’t reliably treated.
• For emergency preparedness — store about one gallon per person per day for several days.

The environmental cost

Single-use bottles take energy to make and transport, and many aren’t recycled. A reusable bottle and a certified filter is cheaper and lighter on the planet.

Bottom line

For most people in most cities, filtered tap water is as safe as bottled — and far cheaper. Know your water by reading your water quality report, and use bottled water for emergencies or confirmed problems.