Boil Water Notice Guide: What to Do Before, During, and After

The coffee maker is loaded, the kids need breakfast, and your phone buzzes with an alert: boil water notice issued for your area.

Suddenly every glass, ice cube, and toothbrush feels like a question mark. Can you shower? What about the dishwasher? And what about the filtration system under your sink?

A boil water notice is one of the most common water alerts in the country, and it rarely comes with much warning. The good news is that the right steps are simple once you know them. This guide walks through why boil water notices happen, what to do while one is in effect, and how to get back to normal when it's lifted.

Why October 15 Is a Good Day to Think About Your Water

October 15, 2026, is Imagine a Day Without Water, a national day of action from the US Water Alliance and the Value of Water Campaign. The goal is to highlight how much daily life depends on water and on the systems and people that deliver it.

For most of us, water is invisible until something goes wrong. A boil water notice is one of those moments when the pipes under our streets suddenly become very real. It's a good reminder to understand how those systems work and to have a plan ready before you need one.

Why Boil Water Notices Happen

Utilities issue a boil water notice when there's a chance harmful microbes like bacteria, viruses, or parasites could be in the water supply. Common triggers include:

• Water main breaks: A break can let soil and outside water into the system.
• Pressure loss: When pressure drops, contaminants can be drawn into pipes that would normally push water outward.
• Equipment failures: Power outages or treatment plant problems can interrupt normal disinfection.
• Flooding: Floodwater can overwhelm treatment systems or enter the distribution network.
• Positive bacteria tests: Routine sampling sometimes turns up a result that calls for precaution.

Many notices are precautionary. That means the utility hasn't confirmed contamination, but conditions made it possible. Utilities would rather be cautious, and so should you. Treat every boil water notice as real until your utility says otherwise.

Boil Water Notice vs. Do Not Drink Notice

A boil water notice is for microbial concerns. Boiling kills germs, so it's the right fix for that problem.

A do not drink notice is different. It's typically issued when chemical contamination is a concern, and boiling won't make chemically contaminated water safe. If you ever see a do not drink or do not use notice, follow those instructions exactly and use bottled water.

How Long Does a Boil Water Notice Last?

There's no set timeline, but the process is fairly consistent. Before lifting a boil water notice, utilities typically repair the problem, restore pressure, flush affected lines, and collect water samples for testing.

Those samples need to come back clear before the notice is lifted. Because lab tests for bacteria take time to complete, many boil water notices last at least a day, even when the repair itself is quick.

Larger events, like widespread power outages or severe weather, can stretch a boil water notice longer. Your utility's website and alerts are the best place to track progress.

The Pipes Behind Your Tap

Boil water notices often trace back to aging infrastructure, and the numbers show why this matters nationwide.

In its 2025 Report Card for America's Infrastructure, the American Society of Civil Engineers gave the nation's drinking water systems a C-, the same grade they earned in 2021. According to ASCE, EPA estimates the country's water infrastructure needs at $625 billion over 20 years.

A few other figures put that in perspective:

• The U.S. has more than 2 million miles of underground drinking water pipes.
• About 20% of installed water mains, roughly 450,000 miles, have exceeded their useful life, according to an industry summary of the ASCE findings.
• On a positive note, ASCE reports that water main breaks per 100 miles of pipe have been declining since 2018, largely as utilities replace older cast iron and asbestos cement pipes.

Fast-growing metros like Dallas-Fort Worth, Houston, San Antonio, Austin, Phoenix, and Las Vegas face their own version of this challenge: keeping older neighborhoods maintained while building out new ones. Heat, drought, shifting soils, and the occasional hard freeze all add stress to underground pipes.

The takeaway? A boil water notice can happen anywhere, including in cities with excellent water. Being ready is just smart planning.

What to Do During a Boil Water Notice

Here's your checklist, based on CDC guidance. Always follow your local utility's specific instructions first, since they may add steps for your situation.

Drinking and Cooking

• Use bottled water or boiled water for drinking, cooking, and preparing food.
• To boil, bring water to a full rolling boil for 1 minute, then let it cool. CDC recommends 3 minutes at elevations above 6,500 feet, which doesn't apply to any of Dupure's metro areas.
• Store boiled water in clean, covered containers.
• Use bottled or boiled water to wash fruits and vegetables.

Ice, Coffee, and Appliances

• Don't use ice or water from your refrigerator dispenser. Throw out any ice made from tap water before or during the notice.
• Skip the coffee maker unless you fill it with bottled or boiled water.
• Boil tap water even if it's filtered. CDC's guidance includes pitcher filters and home filtration systems.

Babies, Kids, and Pets

• If you formula-feed, ready-to-use formula is the simplest option. Otherwise, mix formula with bottled or boiled and cooled water.
• Give young children a sponge bath so they don't swallow bath water.
• Give pets bottled or boiled water too.

Hygiene and Cleaning

• Brush teeth with bottled or boiled water.
• Handwashing with soap and tap water is usually fine, but follow your local guidance.
• Adults can generally shower, but avoid swallowing any water.
• Use a dishwasher with a sanitizing cycle, or wash dishes with boiled water. Follow your utility's guidance on handwashing dishes.

It's a lot of small changes, but most boil water notices last only a day or two. A little planning makes that stretch much easier.

One more tip: tape a note over the kitchen faucet and the refrigerator dispenser while a boil water notice is in effect. It's an easy way to keep everyone in the house, including guests and older kids, from grabbing a glass out of habit.

What About My Reverse Osmosis System During a Boil Water Notice?

It's a fair question, and the answer is simple: boil your RO water during a boil water notice, just like tap water.

Reverse osmosis is excellent at reducing dissolved contaminants like minerals, metals, and many chemicals. But a boil water notice is about microbes entering the public supply, and CDC advises boiling water even when it's been through a home filter. Your utility's instructions apply to every tap in your home, including the one connected to your RO system.

Once the boil water notice is lifted, your filtration system may need a little attention before you go back to normal use. More on that below.

After a Boil Water Notice Is Lifted

When your utility gives the all-clear, take a few minutes to reset your home's water. Here's what to do:

1. Flush your plumbing. Run all cold water faucets for several minutes, or as long as your utility recommends, to clear water that sat in your pipes during the boil water notice.
2. Flush your appliances. Run water through refrigerator dispensers, and follow your manufacturer's instructions for other appliances connected to your water line.
3. Reset your ice maker. Empty the ice bin, throw out the ice, and discard the next few batches.
4. Check your filters. Follow manufacturer guidance for refrigerator filters, faucet filters, and under-sink systems. Many manufacturers recommend replacing pre-filters or sanitizing a system after a boil water notice.
5. Watch for anything unusual. If your water looks cloudy, smells off, or tastes strange after flushing, contact your utility.

If you're a Dupure customer and aren't sure whether your system needs service after a boil water notice, reach out to our team. [EDITOR NOTE: Confirm Dupure's post-advisory service guidance before publishing.]

Boil Water Notice Myths to Skip

A few common assumptions can trip people up during a boil water notice. Here's what to know instead.

"Warm water from the kettle is good enough."

Water needs to reach a full rolling boil and stay there for 1 minute. Hot tap water or water that's only steaming hasn't been heated enough to kill germs.

"My filter means I can skip boiling."

Home filters vary widely, and most aren't designed or certified to remove bacteria and viruses. During a boil water notice, boil filtered water too.

"Boiling fixes any water problem."

Boiling handles microbes. It won't remove chemicals, metals, or fuel, which is why chemical emergencies get a do not drink notice instead.

"Boil water notices only happen in older cities."

Power outages, pressure drops, and equipment problems can affect any water system, including brand-new ones. Every household benefits from a plan.

Build a Simple Water-Ready Kit

The best time to prepare for a boil water notice is before one shows up. A basic kit takes an afternoon to put together:

• Stored drinking water: Ready.gov recommends at least one gallon of water per person per day for several days. Don't forget pets.
• A large pot with a lid: Handy for boiling and storing water.
• Clean, food-safe containers: For cooled, boiled water.
• Ready-to-use infant formula: If you have a baby at home.
• Paper plates and cups: Fewer dishes means less boiled water needed.
• Hand sanitizer: A backup for handwashing.

While you're at it, note where your home's main water shutoff valve is located. It's useful during any plumbing emergency.

How to Get Boil Water Notice Alerts

Boil water notices travel fast, but not always to everyone. To make sure you hear about one quickly:

• Sign up for text or email alerts from your water utility.
• Enable local emergency alerts on your phone.
• Follow your utility and city on social media.
• Keep your contact information current on your water account.

If you hear about a boil water notice secondhand, confirm it with your utility's website. Notices often cover specific neighborhoods or zip codes, so check whether your address is included.

The Bigger Picture

Imagine a Day Without Water is a good moment to appreciate everything it takes to deliver safe water to your tap every day. Most days, that system works so well we never think about it.

When it doesn't, a boil water notice is the safety net. Knowing what to do, having a small kit ready, and understanding how your filtration system fits in means you can handle the next notice calmly. Your household stays protected, and life keeps moving.

Save this boil water notice checklist somewhere easy to find, like a note on your phone or the inside of a kitchen cabinet. When the next alert arrives, you'll know exactly what to do.

Have questions about your home's water or your filtration system? Our team is happy to help.