How to Purify Water at Home: 7 Methods Compared

To purify water at home, match the method to the problem: boiling, disinfection tablets and UV kill germs, while carbon filters, distillation and reverse osmosis reduce chemicals. No single method does everything, so the first step is knowing what is in your water.

Step one: test your water first

Before you choose a method, find out what you are trying to remove. City water in the U.S. is disinfected, so germs are usually not the everyday issue. The concerns tend to be chemicals such as lead from old plumbing, PFAS, nitrate and disinfection byproducts like trihalomethanes. Private wells can have both germs and chemicals.

Two easy starting points:

• For a specific contaminant such as lead, use a certified lab test. For an overall TDS reading, get a free water test from Sanavia, mailed anywhere in the U.S. or in person in Northern Virginia.
• Look up contaminants reported for your utility with our zip code water quality lookup.

What are some methods to purify water?

Here are the seven most common water purification methods you can use at home, from emergency options to everyday systems.

1. Boiling

Boiling is the most reliable way to kill bacteria, viruses and parasites. It does not remove chemicals like lead, nitrate or PFAS. In fact, as water evaporates, those chemicals become slightly more concentrated. Boiling is the right tool for a boil water advisory, not for chemical contaminants.

2. Chlorine or iodine tablets

Disinfection tablets are an emergency and outdoor option. They kill most bacteria and viruses after a waiting period listed on the package. Some parasites, such as Cryptosporidium, are highly resistant to chlorine, and tablets do nothing for chemicals. Follow the label exactly for dose and contact time.

3. UV (ultraviolet) purifiers

UV light inactivates bacteria, viruses and parasites so they can't reproduce. It works well on clear water and is often used on well systems. UV does not remove chemicals, metals or particles, and cloudy water can shield germs from the light, so it is usually paired with a sediment filter.

4. Pitcher filters

Pitcher filters use activated carbon, sometimes with ion-exchange media. They improve taste and reduce chlorine, and some models are certified to reduce specific contaminants. They are slow, hold small amounts, and generally don't change dissolved minerals much. They are not designed to make untreated water safe. Compare them in reverse osmosis vs pitcher filter.

5. Faucet-mount filters

Faucet filters work like a pitcher filter attached to your tap. You get filtered water on demand, but the carbon cartridge is small and needs frequent replacement. What they reduce depends on the specific product and its certifications.

6. Distillation

A countertop distiller boils water and condenses the steam into a clean container. It removes minerals, salts and metals and kills germs. It is slow, typically taking hours to make a gallon, and uses electricity for every batch. Some volatile chemicals can carry over with the steam unless the unit has a carbon filter. Read more in reverse osmosis vs distilled vs deionized water.

7. Reverse osmosis

A reverse osmosis system combines sediment and carbon filters with a semipermeable membrane that holds back most dissolved minerals, salts and metals. It covers the widest range of chemical contaminants of any common home method and delivers water at the tap. Home RO systems are designed for water that is already microbiologically safe, such as city water. Learn the basics in what is reverse osmosis water.

Water purification at home: what each method removes

Method	Good for	Misses	Best use
Boiling	Bacteria, viruses, parasites	Lead, nitrate, PFAS and other chemicals (concentrates them)	Boil water advisories, emergencies
Chlorine or iodine tablets	Most bacteria and viruses	Some parasites, all chemicals	Emergencies, camping
UV purifier	Bacteria, viruses, parasites in clear water	Chemicals, metals, particles	Wells, paired with filtration
Pitcher filter	Chlorine taste and odor; certain contaminants depending on certification	Most dissolved minerals; not made for untreated water	Taste improvement on city water
Faucet filter	Chlorine taste and odor; certain contaminants depending on certification	Most dissolved minerals; small cartridge capacity	Convenient taste improvement
Distillation	Minerals, salts, metals; kills germs	Some volatile chemicals	Small volumes, devices like CPAPs
Reverse osmosis	Most dissolved minerals, salts and metals, plus what its carbon stages capture	Germs (not designed for untreated water)	Everyday drinking and cooking water

How to purify water in an emergency

If your utility issues a boil water advisory, or you are unsure whether water is safe after a flood or main break, boiling is the standard method. Follow your utility's instructions first. The general steps are well established:

1. Clear cloudy water. Let it settle, then pour the clear water through a clean cloth, paper towel or coffee filter.
2. Bring it to a rolling boil for 1 minute. At elevations above 6,500 feet, boil for 3 minutes.
3. Let it cool naturally. Don't add ice unless it was made from safe water.
4. Store it in clean, covered containers. Use it for drinking, cooking, brushing teeth and making formula until the advisory is lifted.

If you can't boil, use disinfection tablets and follow the package directions. Remember that boiling and tablets deal with germs only. If the concern is a chemical, such as lead or nitrate, boiling won't help. Use bottled water until the source is fixed.

The best way to purify drinking water every day

For everyday drinking water on a city supply, reverse osmosis is the most complete home option. Boiling, tablets and UV are for germs, which treated city water already handles. Pitchers and faucet filters improve taste but cover a narrower range. Distillation works but is slow and power-hungry.

The Hydra under-sink reverse osmosis system is our answer to this job. It filters through five stages: sediment, carbon, carbon block, a reverse osmosis membrane and a post-filter. It is tankless and filters on demand at up to 800 gallons per day, includes its own faucet, and shows the TDS of your filtered water on a real-time readout.

We had it tested. An independent accredited lab measured a real Arlington, VA home's tap water before and after the Hydra: total trihalomethanes fell from 58 ppb to 2.79 ppb, a 95% reduction. See the full results.

The Hydra costs $999 to install yourself or $1,250 professionally installed in DC, Maryland and Virginia. Shipping in the U.S. is free, returns are accepted for 60 days, and it carries a 3-year warranty. Its two cartridges are replaced every 12 months and are sold together in the Filter Bundle.

Not sure yet? Look up your utility with our zip code lookup, get a free TDS test, and let what you find decide.