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Boil-Water Advisory Lifted? Here's What's Still in Your Tap
Water Safety · Explainer
Your Boil Water Advisory Is Over — But Is Your Water Actually Safe to Drink?
A boil water advisory being lifted means the water utility's test came back clean — it doesn't automatically mean the water sitting in your home's own pipes, water heater, and filters is safe yet.
Key Takeaways
- Most boil water advisories are precautionary: of roughly 21,000 U.S. drinking water alerts issued between 2012 and 2014, about 53% were called after a main break or repair, not confirmed contamination — per a University of Michigan review of EPA-reported data.
- Deteriorating pipes cause an estimated 240,000 water main breaks a year in the U.S., wasting about 1.7 trillion gallons of treated water — Bipartisan Policy Center, citing EPA figures.
- An advisory being lifted reflects lab results from the utility's distribution system, not the water that sat in your specific pipes and water heater — a distinction CDC drinking water expert Jasen Kunz outlined to PBS News.
- Health departments recommend running cold-water taps for at least 5 minutes, and running hot-water taps until the water runs cool — which means the old water in the tank has been pushed out — before drinking, cooking, or brushing teeth again — Oakland County, MI guidance.
- Stagnant water sitting in a home's water heater can settle into the 77°F–113°F range where Legionella bacteria grow best, per the CDC, which is one reason the hot-water flush matters as much as the cold-water flush.
- CDC researchers estimate about 7.15 million waterborne illnesses occur in the U.S. each year, roughly 1.13 million of them linked to drinking water — CDC, Emerging Infectious Diseases — which is why the days right after an advisory lifts are worth taking seriously.
- Any filter cartridge that stayed in use during the advisory — pitcher, under-sink, or refrigerator — should be replaced, not reused, since standard filters aren't rated to remove the bacteria a boil water advisory guards against.
What Is a Boil Water Advisory, and Why Was One Issued in Your Area?
A boil water advisory is a notice from a public water utility telling customers to boil tap water before drinking, cooking, or brushing their teeth, because the system can't yet guarantee the water is free of harmful bacteria, viruses, or parasites. Utilities issue them when something disrupts the normal barrier between raw water and your tap — an EPA review of advisories nationwide found the majority trace back to water main breaks, distribution repairs, or a sudden loss of system pressure, with a smaller share issued after a routine sample actually tested positive for bacteria.
Pressure matters more than most homeowners realize. Water mains are normally pressurized enough to keep outside groundwater from working its way in through small cracks or joints. When a pipe bursts or a pump station loses power, that pressure can drop below the safety threshold utilities use — commonly cited around 20 psi — and soil or groundwater can theoretically seep into the line. Memphis Light, Gas and Water CEO Doug McGowen told PBS News that most of his utility's advisories have been precautionary in exactly this way — pressure dipped below the regulatory standard during winter storms, with no confirmed contamination, but the utility couldn't yet prove the water was clean.
Is Your Water Automatically Safe the Moment the Advisory Is Lifted?
Not automatically, no. An advisory gets lifted once the utility collects new water samples from its distribution system and a lab confirms clean results — typically two consecutive rounds, though the exact requirement is set state by state. That clearance describes the water in the utility's mains, not the water that's been sitting motionless in your home's interior pipes, water heater, aerators, and any filter cartridges for the length of the advisory. CDC guidance on drinking water advisories and most local utilities recommend a short flushing routine before you go back to using tap water exactly as you did before the advisory started.
The table below breaks down what needs an extra step once the advisory has been lifted and what doesn't, based on county public health guidance issued after advisories are lifted.
| Household use | Right away? | What to do first |
|---|---|---|
| Drinking water | Flush first | Run the cold tap 5+ minutes before filling a glass |
| Cooking / making ice | Flush first | Same 5-minute cold-water flush, then discard the first three batches of ice |
| Brushing teeth | Flush first | Flush the specific tap you'll use |
| Bathing / showering | Safe now | No flush required |
| Laundry | Safe now | No special steps needed |
| Dishwasher | Run empty first | After the hot-water flush, run one empty cycle on the hottest or sanitize setting |
| Hot-water fixtures | Flush first | Run hot water until it runs cool — roughly 15–30 min depending on tank size |
| Baby formula / infants | Extra caution | Use bottled or boiled-and-cooled water a bit longer if unsure |
What's Still Sitting in Your Pipes, Water Heater, and Filters?
Three things typically need attention after the all-clear: stagnant water in your plumbing, warm standing water in your water heater, and any filter media that was in use during the advisory. Interior pipes that weren't used much during the advisory can hold water old enough to have picked up sediment or biofilm from the pipe walls, which is why a cold-water flush is standard advice. Water heaters are a bigger concern — a full tank of water sitting at moderate temperature for a day or two creates conditions where bacteria like Legionella can multiply, and the CDC notes Legionella grows best in water between roughly 77°F and 113°F, a range an idle residential tank can easily sit in.
Point-of-use filters — pitcher filters, faucet attachments, under-sink cartridges, refrigerator filters — generally aren't designed to remove bacteria at all; they're built for taste, odor, and chemical reduction. If a filter kept running during the advisory, it may have accumulated whatever passed through it, so replacing the cartridge is the safer move rather than continuing to run water through a compromised one. This is a different job than what a whole-house water treatment system handles day to day — those systems address ongoing water quality issues like chlorine, iron, or hardness, not the specific bacterial risk a boil water advisory is guarding against, so both matter for different reasons.
How Do You Safely Flush Your Home's Plumbing After a Boil Water Advisory?
The flushing sequence recommended by most utilities and county health departments follows a consistent order:
Cold water first. Remove and set aside faucet aerators if you can, then run every cold-water tap in the home — including outdoor spigots, showers, and any fountains — for at least 5 minutes, longer if your service line is unusually long or you live in a multi-unit building.
Hot water second. Run hot water only at every faucet until the water runs cool, which typically takes at least 15 minutes for a standard 40-gallon tank and closer to 30 minutes for tanks larger than that, according to county guidance. Water running cool is the signal you're looking for: it means the water that sat in the tank through the advisory has been pushed out and replaced with fresh supply. This clears the tank itself, not just the line leading to it.
Appliances and add-ons. Run an empty dishwasher through one full cycle on its hottest or sanitize setting, flush an ice maker through three batches of ice and discard them, run a water softener through a complete regeneration cycle, and replace any water filter cartridges that were active during the advisory. If you use a water softener or whole-house filter, this regeneration step matters just as much as the tap flush — stagnant water sits in that equipment too.
What Should You Do About Ice, Filters, and Small Appliances After the Advisory Lifts?
Discard any ice that was made during the advisory itself — freezing doesn't kill bacteria the way boiling does, so old ice needs to go regardless of how long it's been in the freezer. Once the advisory lifts, run your ice maker through three batches and throw those out too, before trusting the ice that follows. Humidifiers, CPAP machines connected to tap water, and any other small appliance that draws directly from the plumbing should get the same flush-and-replace-filter treatment as your main taps.
Pet water bowls deserve the same caution as your own drinking glass — most utility guidance treats pets the same as people for advisory purposes, since animals are susceptible to the same waterborne bacteria and parasites.
Why Do Boil Water Advisories Happen in the First Place?
Infrastructure age is the biggest underlying driver. Steve Via, director of federal relations for the American Water Works Association, told PBS News that older pipe materials — some dating to mid-20th-century installations — have distinct failure patterns, and utilities are continually working through backlogs of replacement work while trying to balance cost against risk. Research reviewing Great Lakes-region data found water main break rates climbed roughly 27% between 2012 and 2014 alone, much of it attributed to cast-iron pipe installed more than 50 years ago.
Weather compounds the problem. Via also pointed to winter storms as a common trigger — frozen ground shifts around buried pipes and rapid freeze-thaw cycles crack them, which is exactly what drove a cluster of Memphis-area advisories in recent years, according to McGowen. Whatever the immediate cause, a drop in system pressure is the common thread behind most advisories, since it's the mechanism that lets outside contamination reach the line in the first place.
Does Boiling Water Remove Lead, Chemicals, or PFAS?
No — and this is one of the most important distinctions in a boil water advisory. Boiling kills or inactivates biological pathogens like E. coli, Giardia, and Cryptosporidium, but it does nothing to remove dissolved chemicals, heavy metals, or PFAS compounds. The CDC explicitly separates boil water advisories from "do not drink" advisories for exactly this reason — a do-not-drink notice is issued when the concern is chemical, and boiling that water can actually concentrate some contaminants as the water volume reduces.
This is also why boiling and long-term filtration solve different problems. A boil water advisory is a temporary, bacteria-specific event; PFAS, chlorine byproducts, and lead exposure are ongoing water-quality issues that boiling was never meant to address. Households wanting protection against those persistent contaminants typically look at whole-house PFAS filtration or combined fluoride and chlorine filtration installed at the point where water enters the home, which runs continuously rather than only during an advisory.
What Should Higher-Risk Households Do Differently After an Advisory?
Infants, pregnant people, older adults, and anyone with a compromised immune system face a higher risk from the bacteria and parasites a boil water advisory is meant to catch, so CDC guidance generally recommends these households lean on bottled or boiled-and-cooled water for infant formula, extend the flushing window slightly, and watch for gastrointestinal symptoms in the days after the advisory lifts. Anyone in this group who develops diarrhea, cramping, nausea, or fever after the water returned to normal use should mention the recent advisory to a healthcare provider, since it can help narrow down the cause faster.
How Can You Protect Your Home Between Boil Water Advisories?
Boil water advisories are largely unpredictable — they follow infrastructure failures and weather events a homeowner can't control. What is controllable is how your household handles water quality the rest of the time. A whole-house sediment and carbon filtration setup won't prevent an advisory, but it does mean your baseline water quality — chlorine taste, sediment, PFAS exposure — is being managed continuously rather than left to municipal treatment alone. Pairing that with a system built around your actual local water conditions starts with knowing what's really in your water; SoftPro Water Systems and its founder Craig "The Water Guy" Phillips have built that assessment step into how the company recommends equipment in the first place, rather than selling a one-size-fits-all system.
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Not Sure What's Actually in Your Water?
A boil water advisory addresses one temporary risk. Chlorine, PFAS, hardness, and fluoride are the ones sitting in your water every other day of the year.
Get Your Free Water Analysis ReportFrequently Asked Questions
How long after a boil water advisory is lifted should I wait to drink tap water?
Most guidance says you can drink tap water once you've flushed the specific cold-water tap you're using for at least 5 minutes. There's no separate multi-day waiting period once the utility has officially lifted the advisory — the flush is the main step, not extra time passing.
Do I need to boil water for showering or bathing during an advisory?
No. CDC and most local utility guidance allow showering and bathing with tap water during a boil water advisory, as long as you avoid swallowing it. Sponge-bathing is typically recommended for infants and toddlers instead of a full bath.
Is it safe to run my dishwasher during a boil water advisory?
Yes, if your dishwasher has a sanitizing cycle or reaches a final rinse temperature of at least 150°F. If you're not sure it does either, hand-washing with boiled or bottled water is the safer option until the advisory lifts.
How long should I flush my water heater after a boil water advisory?
Run hot water only, at every faucet, until it runs cool — typically at least 15 minutes for a standard 40-gallon tank and up to 30 minutes for larger tanks. Cool water means the old water in the tank has been replaced. This clears standing water from the tank itself, not just the pipe leading to it.
Should I throw away ice made during the advisory?
Yes. Freezing doesn't kill the bacteria or parasites a boil water advisory is meant to catch, so any ice made during the advisory period should be discarded, along with the first three batches an automatic ice maker produces after the advisory lifts.
Does a home water filter make boiling unnecessary during an advisory?
No. Standard pitcher, faucet, under-sink, and refrigerator filters are built to improve taste and reduce chemicals, not to remove bacteria or parasites. Utilities recommend bypassing these filters during an advisory and boiling water regardless of whether a filter is in place.
What's the difference between a boil water advisory and a "do not drink" advisory?
A boil water advisory addresses biological contamination — boiling kills the bacteria, viruses, or parasites of concern. A "do not drink" advisory addresses chemical contamination, where boiling does nothing and can even concentrate some chemicals. If your area issues a "do not drink" or "do not use" notice, bottled water is the only safe option until officials say otherwise.
Craig Phillips has spent over 30 years in the water treatment industry as owner of Quality Water Treatment and on-camera water quality expert for SoftPro Water Systems. He founded Quality Water Treatment in 1990 and has since built SoftPro into a factory-direct water softening and filtration brand serving households nationwide.
