Bottled Water vs. Tap Water: Which Is Actually Safer?

For most people in the US, tap water from a public water system is as safe as bottled water, costs far less, and comes with much more public information about what’s in it. Bottled water is not automatically safer. It is regulated by a different agency, the FDA, under standards that are mostly based on the EPA’s tap water rules. Bottled water does make sense in specific situations: during a boil water or do-not-drink advisory, when your home has a known lead problem you haven’t fixed yet, or when a private well has a contaminant like high nitrate and you’re mixing infant formula.

Here’s how the two actually compare.

Who regulates what

Tap water from public water systems is regulated by the EPA under the Safe Drinking Water Act of 1974. States usually carry out day-to-day oversight.
Bottled water is regulated by the FDA as a food under the Federal Food, Drug, and Cosmetic Act. The FDA says it ensures its bottled water standards are compatible with the EPA’s standards for tap water, and the CDC notes that the FDA bases bottled water standards on the safe drinking water rules for tap water.

The FDA’s rules for bottled water include “standard of quality” limits on chemical, microbial, physical and radiological contaminants; “standards of identity” that define label terms; and current good manufacturing practice rules covering things like sampling, plant design and record-keeping. The FDA inspects bottling plants under its general food safety program, and some states also license bottlers.

One gap to know about: private wells are not covered by either system. Well owners are responsible for their own testing. See our well water testing guide.

How the standards compare

For most contaminants, the bottled water limit and the tap water limit are the same or very close. For example, FDA’s bottled water rules set arsenic at 0.010 mg/L and uranium at 30 µg/L, matching EPA’s tap water limits.

Lead is the notable difference. The FDA says the bottled water limit for lead is 5 parts per billion (ppb), compared with 15 ppb for tap water. But the two numbers work differently:

The bottled water number is a limit on the product.
The tap water number is an action level under the EPA’s Lead and Copper Rule, not a regular limit. It triggers required steps, such as corrosion control and public education, when more than 10 percent of homes sampled exceed it. Under the 2024 Lead and Copper Rule Improvements, as published, the lead action level drops to 10 ppb starting November 1, 2027. Check EPA’s rule page for the current status.

More important, lead in tap water almost always comes from the pipes and fixtures between the water main and your faucet, not from the treatment plant. So the real question for tap water lead is about your home’s plumbing. Our guide to lead in tap water explains how to find out.

What each one has to tell you

This is where tap water has a clear advantage.

Tap water: Every community water system must deliver an annual water quality report, called a Consumer Confidence Report, by July 1 each year. It covers the previous calendar year and lists the water’s sources, detected contaminants and compliance with federal standards. Under EPA’s updated reporting rule, larger systems will start sending a second report each year beginning in 2027. Utilities’ violation records are also public in EPA’s databases, which is what our grades are built on. See how to read your water quality report and look up your utility.

Bottled water: The CDC notes there is currently no standard label for bottled water. Labels often list the source, the treatment method and a contact for water quality information, but that’s not the same as a public report. A 2009 Government Accountability Office review of 83 bottled water labels found that information comparable to what tap water consumers receive was available for only a small percentage of them, and that FDA does not require companies to provide it. GAO lists its recommendation on consumer information as closed but not implemented.

What the labels mean

The FDA defines several label terms:

Spring water must come from an underground formation that flows naturally to the surface, collected at the spring or through a borehole into the same formation.
Artesian water comes from a well that taps a confined aquifer under pressure.
Mineral water comes from an underground source and contains at least 250 parts per million of total dissolved solids. The minerals can’t be added later.
Purified water has been treated by distillation, reverse osmosis or another suitable process.

Some bottled water starts as tap water. Under FDA rules, water from a community water system must be labeled “from a community water system” or “from a municipal source,” unless it has been treated enough to meet a definition such as “purified.”

Microplastics

Bottled water has drawn attention for plastic particles. A January 2024 study in the Proceedings of the National Academy of Sciences, supported by the National Institutes of Health, used a new imaging method to count particles in three popular bottled water brands. It found an average of about 240,000 plastic particles per liter, about 90 percent of them nanoplastics (smaller than one micrometer). That was 10 to 100 times more than earlier studies had counted, mainly because earlier methods couldn’t see the smallest particles.

Two important caveats: the study covered only three brands, and the health effects of swallowing micro- and nanoplastics are not yet well understood. Our full explainer on microplastics in drinking water covers what’s known about tap water too.

Fluoride

Many community water systems add fluoride, and the CDC notes that some, but not all, bottled water contains fluoride. The CDC says bottled water labeled de-ionized, purified, demineralized or distilled contains no or only trace amounts of fluoride unless fluoride is listed as an added ingredient. If your family drinks mostly bottled water, ask your dentist whether that affects your children’s fluoride needs. Fluoride is a debated topic; see fluoride in tap water: what the science says.

Cost

Tap water is billed by your utility, usually per thousand gallons or per hundred cubic feet. Bottled water is priced per bottle or per gallon. Prices vary a lot by place and brand, so the easiest way to compare is to check your own water bill’s rate and divide it down to a gallon, then compare it with the per-gallon price of the bottled water you buy. Do the math once and you’ll usually find tap water costs a small fraction of the bottled price. If you use a filter, add the replacement cartridge cost to the tap side.

Environmental footprint

Single-use plastic bottles create waste, and most are not recycled. According to the EPA’s most recent national figures, the recycling rate for PET bottles and jars (the plastic most water bottles are made of) was 29.1 percent in 2018. Bottled water also has to be packaged, trucked and stored, while tap water arrives through pipes that already exist.

When bottled water makes sense

Bottled water is the right call in some situations:

Boil water advisories. The CDC advises using bottled water or boiled tap water for drinking, cooking and brushing teeth. See our guide to boil water advisories.
Do-not-drink or do-not-use advisories. The CDC notes that boiling does not remove chemicals, so bottled water is the safe choice when officials say not to drink tap water.
A known lead problem in your home that you haven’t addressed with a certified filter or plumbing repairs, especially with young children or someone pregnant in the house.
A private well with a problem, such as nitrate above 10 mg/L. The American Academy of Pediatrics says that water shouldn’t be used for infant formula, and recommends purchased water or another low-nitrate source. See our post on tap water for baby formula.
Weakened immune systems. Some people with severely weakened immune systems are advised to take extra precautions with drinking water. CDC guidance notes that bottled water quality varies and that people using it for this reason should research their supplier carefully. Ask your doctor what’s right for you.

Outside those cases, a certified filter is usually a better long-term answer than bottled water if you want to improve taste or reduce a specific contaminant. Look for NSF/ANSI 42 certification for chlorine taste and odor, or NSF/ANSI 53 with a lead reduction claim for lead. Many pitchers are certified only to NSF/ANSI 42, so check the listing before counting on one for lead. Our guide to choosing a water filter pitcher can help.

Bottom line

Bottled water and tap water are held to broadly similar safety standards, set by different agencies. Tap water comes with far more public disclosure, costs much less and creates less waste. The biggest risk to tap water quality in many homes is the home’s own plumbing, which you can test for and fix. Keep bottled water for emergencies and specific problems, and check your utility’s record to see whether your tap water has any. You can find your water system by ZIP code.