Water — Track 2: When Your Water Is Disrupted
A boil water advisory covers more than drinking. Coffee makers, ice, brushing teeth, bathing infants, and washing produce all have specific guidance. This page covers the full protocol — and the one situation where boiling makes things worse.
Advisory types
The name of the advisory determines what you can and cannot do. Most people treat all three as the same thing — they aren't.
Boil Water Advisory
Biological risk — boiling makes tap water safe
What it means
Tap water may contain bacteria, protozoa, or viruses that boiling will kill. The risk is biological — typically caused by a main break that allowed pressure loss, or a situation where bacterial intrusion into the system is possible.[1]
Boiling status
Boiling makes tap water safe for consumption
Tap water for bathing
Generally safe for healthy adults. Use boiled or bottled water for infants and open wounds.
Do Not Drink Order
Tap water is unsafe to drink — may be safe for other uses
What it means
Tap water may contain contaminants at levels that make it unsafe for consumption regardless of treatment, but may still be safe for bathing, flushing, and some other uses. The specific guidance depends on the contamination type — follow official communications precisely.
Boiling status
Boiling may or may not help — depends on the contaminant. Follow official guidance.
Tap water for bathing
Depends on the specific advisory. Follow utility guidance for each use.
Do Not Use Order
Most serious — avoid all contact with tap water
What it means
Tap water is unsafe for any household use — not just consumption. Chemical contamination, sewage intrusion, or other hazards that boiling cannot address. Do not use tap water for drinking, cooking, bathing, or any other purpose.
Boiling status
Boiling does NOT make this water safe. Use stored water only.
Tap water for bathing
No. Avoid all contact with tap water.
When boiling makes things worse
Under a do-not-use advisory triggered by chemical contamination, boiling tap water actually concentrates some contaminants by reducing water volume. More water evaporates — but the chemicals stay. Boiling does not remove lead, nitrates, most industrial solvents, petroleum products, or agricultural chemicals. If an advisory is for chemical reasons, use stored water and follow official guidance. Do not attempt to treat chemically contaminated water by boiling.
The complete protocol
Under a standard boil water advisory. For do-not-use advisories, the answer for every row is "avoid — use stored water only."
Protocol based on CDC and EPA guidance for standard boil water advisories involving biological contamination.[1][2] For do-not-use orders involving chemical contamination, use stored water only for all uses listed above.
Duration
Duration depends entirely on the cause. There is no standard timeline — advisories lift when testing confirms the system is safe, not on a fixed schedule.
Precautionary advisory after pressure loss or main break
24–72 hours typically. The utility issues the advisory as a precaution when pressure drop creates the possibility of bacterial intrusion. Testing confirms safety before lifting.
Confirmed bacterial contamination
Several days to a week. Requires flushing the system, resampling, and receiving two consecutive clean tests 24 hours apart before the advisory can lift.
Infrastructure failure from a disaster
Days to weeks. Large-scale damage requires repairs, system-wide flushing, and testing at multiple points before service is restored. Plan for your full stored supply.
Do-not-use order from chemical contamination
Unpredictable — varies from days to months depending on the contaminant and extent of system exposure. Chemical contamination requires specialized testing and remediation.
How to find out
A boil water advisory is issued by the water utility or local public health authority. The best sources for current advisory status:
Your water utility's website or alert system
The most authoritative and fastest source. Sign up for email or text alerts now — most utilities offer this service.
Water utility 24-hour emergency line
Save this number now. Found on your water bill or utility website.
Local emergency management alerts
Wireless Emergency Alerts (WEA), local TV and radio, and Wireless Emergency Alerts push to mobile phones for significant public health events.
State drinking water program database
Most state environmental or health agencies maintain online databases of current drinking water advisories. Search "[your state] drinking water advisory" to find your state's page.
When it lifts
When a boil water advisory is officially lifted, there is a flushing step before tap water is safe to drink directly. Skipping it means drinking water that has been sitting stagnant in household pipes throughout the advisory.
Flush all cold water taps for 2–5 minutes each, starting at the tap furthest from the main water meter and working toward it. This pushes stagnant water out of your household pipes.
Flush appliances: Run your refrigerator's water dispenser and ice maker for several minutes. Discard any ice made during or after the advisory until the machine has run through two full cycles with flushed water.
Replace point-of-use filter cartridges (pitcher filters, under-sink filters, refrigerator filters). Filter elements that processed advisory water may be contaminated and should be replaced before use.
Run the hot water heater for 15 minutes after flushing cold taps. This cycles the tank with fresh post-advisory water.
Appliances that need attention
Follow official flushing guidance
Your utility may issue specific flushing instructions when lifting the advisory. If their guidance differs from the general protocol above, follow the utility's instructions — they know the details of the specific event and your system.
Businesses and facilities
Restaurants must comply with food safety regulations that may require closure or switching to bottled water for all food preparation during a boil water advisory. Contact your local health department for specific requirements in your jurisdiction. Regulations vary by state and locality.
Facilities serving children are subject to heightened precautions. Most jurisdictions require notification to parents, use of bottled water for drinking and hand washing, and in some cases temporary closure. Check with your local health department for specific requirements.
Hospitals, dialysis centers, and other healthcare facilities have independent water treatment protocols and follow specific guidance from their accrediting bodies and state health departments during advisory events. If you receive care at such a facility, follow their guidance rather than this page's household protocol.
Related situations
The first-hour protocol when your water goes out — including how to respond before the cause is known.
Action plan →
When the advisory is a do-not-use order — chemical contamination, floodwater, and when no treatment method is adequate.
Contamination guide →
All treatment methods compared — boiling, bleach, tablets, filters, and UV. What each handles and what it doesn't.
Treatment guide →