Start by checking your water utility’s official notice: it determines whether you need to flush, which fixtures or appliances to clear, and how long to run them. There is no universal flush time. If the notice gives household directions, follow those rather than a general example; if it does not, contact the utility or local public-health authority before assuming no action is needed.
Flushing is not one action that clears every part of a home’s water system. Faucets, showers, refrigerator dispensers, filters, softeners, and water heaters may need different steps. Use the notice and equipment manuals to decide what applies to your home, and do not treat clear-looking water or a completed flush as proof of safety on its own.
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1. Confirm the advisory is officially lifted
Use the notice from your water utility or local public-health authority for your service area. Confirm that it applies to your address and read any instructions for household plumbing and connected appliances. A neighbor’s message or a notice for a different area is not a substitute.
The U.S. Environmental Protection Agency (EPA) explains that a utility should tell customers when water is safe and whether they need to take steps after an incident. Depending on what happened, water that entered household plumbing may need to be flushed before normal use. The lift notice and its accompanying instructions control what to do: EPA’s Water Decontamination Frequently Asked Questions for Customers, last updated September 21, 2026.
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Do not assume that an advisory being lifted automatically means every household must flush, or that it means no household action is needed. EPA says utilities should explain whether flushing is necessary and what steps customers should take. The answer may depend on the incident and the service area. If the notice only says the advisory has ended but does not address home plumbing, ask the utility or local public-health authority whether you should flush, which fixtures to include, and whether connected appliances need attention.
This checklist is for household plumbing after a public-system boil-water advisory has ended. Do not use it as a substitute for instructions during an active advisory, a “do not drink” or “do not use” notice, a chemical contamination event, or a private-well problem. Those situations may require different measures. EPA distinguishes among these types of advisories and directs customers to follow the water system’s specific instructions.
2. Find out whether and how much flushing is required
EPA defines flushing as opening valves and faucets and allowing water to flow to remove residual standing water from interior pipes or outlets. Its customer guidance says the time varies with the plumbing and the outlet being cleared. Your utility may specify which fixtures to flush, the sequence, and the duration; follow those directions rather than choosing a time on your own.
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The fixture matters, too. A kitchen faucet, a shower, an outdoor spigot, and a refrigerator dispenser are different outlets or parts of the water system. The time given for one does not automatically apply to another. Similarly, a direction to flush cold water at faucets is not necessarily the same as a direction for hot-water fixtures or equipment with a reservoir or filter. Read the full local procedure before starting so you know which outlets it covers.
If no duration is listed, do not fill in the blank with an internet recommendation or a timer used in another city. Contact the utility or public-health authority and ask for the local number and fixture list. A specific number in another jurisdiction can be useful as an example of how local guidance may work, but it is not a national standard.
3. Flush household faucets if the utility instructs you to
CDC’s household FAQ gives a general sequence for flushing taps: turn on the main water valve, then open the hot and cold taps at faucets one at a time, starting on the highest floor and working down to the lowest. Provide adequate ventilation while running the water. The utility’s incident-specific directions take priority if they specify a different sequence, fixture list, or duration.
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- Check the local directions. Note the required duration and which outlets to include before you begin. Check whether the notice treats cold taps, hot-water fixtures, showers, and outdoor spigots separately.
- Open the main water valve if it was shut. Follow any directions from your utility or plumber for restoring service.
- Work from the highest floor to the lowest. Open faucets one at a time, using hot and cold taps as the local instructions require. CDC’s household FAQ gives this top-to-bottom order; if your utility specifies another sequence, use its procedure.
- Run each outlet for the stated time. Do not assume that one faucet’s timing applies to showers, outdoor spigots, or appliances. Use the time provided for that fixture or group of fixtures.
- Ventilate the area. Follow CDC’s household FAQ guidance to ensure adequate ventilation while flushing.
The CDC sequence is general household guidance, not a fixed-duration rule. The FAQ leaves the time to local officials, and your utility may give a more specific procedure. In particular, do not turn the sequence into a rule to run every tap for five or ten minutes. The important points are to follow the local duration and fixture list, proceed in the directed order, and treat appliances separately if the notice or manufacturer calls for it.
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If you have several faucets, follow the one-at-a-time approach in the CDC household FAQ rather than opening all the taps at once. The guidance places the highest floor first and moves downward. This describes the general household sequence; it does not override any incident-specific directions about which fixtures to open or how long to run them.
4. Respond to sputtering or discolored water
CDC’s toolbox says air in the lines can make a faucet sputter. If this happens, run the tap slowly until the sputtering stops. The slow flow is the recommended response to air-related sputtering; do not mistake that symptom for a reason to invent a different flush duration. Continue to follow the local instructions for the outlet.
If the water is discolored, CDC’s FAQ says to run taps until it clears and not to wash clothes while discoloration remains. This is a specific response to visible discoloration, not a replacement for the utility’s post-advisory procedure. If your local notice addresses discolored water, follow it. Contact the utility if the discoloration does not resolve as directed or if you are uncertain what to do.
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5. Clear appliances and treatment equipment separately
Flushing a sink does not necessarily clear water held in an appliance, filter, softener, or ice maker. Check the utility’s appliance list and each device’s manual; some equipment has reservoirs, cartridges, or internal passages that need separate attention. EPA says utilities should identify whether connected appliances need cleaning.
Think of household flushing in two parts: the outlets and pipes covered by the local tap-flushing directions, and equipment that holds or treats water internally. The latter may have its own instructions, such as flushing a dispenser, discarding ice, replacing a cartridge, running a regeneration cycle, or seeking professional help. Do not assume that completing the faucet sequence completes these separate equipment steps.
Refrigerator water dispenser and icemaker
CDC’s toolbox says to flush the refrigerator dispenser for the duration local officials provide. It does not set a universal time. The same guidance calls for discarding all existing ice, letting the icemaker fill once and discarding that batch, cleaning the ice container, and replacing the filter.
In practical order, dispose of the ice already in the bin, flush the water dispenser for the locally specified period, allow the icemaker to make a new batch and discard that batch as well, then clean the ice container and replace the filter. Follow the refrigerator’s manual for the device-specific steps and the utility’s notice for the dispenser-flushing duration. The CDC FAQ does not provide a standard number of minutes for this appliance.
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Do not assume that ice made after the advisory was lifted is ready to use immediately: CDC’s toolbox specifically says to discard the first new batch after letting the icemaker fill once. If your refrigerator has a filter, follow its manufacturer instructions and the utility’s direction about replacement. Check that a replacement cartridge matches the exact model of your refrigerator rather than choosing one based only on appearance.
Water filters and treatment units
Consult the owner’s manual for water-treatment units. CDC says a cartridge change may be needed and some units may need disinfection. Its home guidance advises maintaining and replacing refrigerator, icemaker, under-sink, faucet, shower, countertop, and pitcher filters according to the manufacturer’s instructions. Check that any replacement cartridge is compatible with the exact device model, and follow local directions about whether replacement is needed after the advisory.
Filters are not interchangeable as a category: the appropriate maintenance depends on the particular unit and cartridge. Use the manual to identify whether the device calls for a replacement, disinfection, or another step after the event. Do not assume every filter needs the same treatment, and do not infer that a filter makes water safe during an active advisory. For post-advisory care, follow the utility and manufacturer rather than relying on a generic filter procedure.
Water softener
A regeneration cycle may be needed after an advisory, according to CDC’s toolbox. Check the softener’s manual or contact its manufacturer for the correct procedure rather than guessing. The need for regeneration is a possibility, not an instruction that every softener must be cycled after every advisory.
A softener is separate from an ordinary faucet, so completing faucet flushing does not establish whether the softener needs attention. Check the local notice and the product manual. If they do not answer whether a regeneration cycle is appropriate, ask the manufacturer or utility before starting one.
Water heater
Do not assume that every household needs to drain a water heater after an advisory. CDC’s home guidance says to follow the manufacturer’s instructions for flushing it or have a professional do the work. Do not use a generic drain procedure if the manufacturer or utility has not called for it.
Water-heater flushing is not the same thing as running hot water at a faucet under a local household procedure. The CDC home guidance does not say that every heater must be drained after every advisory; it directs homeowners to the manufacturer’s instructions or a professional when flushing is needed. If the utility specifically says the heater requires attention, consult its directions and the manufacturer. For work that needs professional help, use a qualified professional.
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Use the utility’s instructions and the equipment manual for any other appliance connected to the water line. If you live in a multi-unit building or have a complex shared system, EPA’s customer FAQ does not provide a building-specific procedure; ask the utility or building manager what applies to your system. A household faucet checklist may not address shared equipment or building-wide plumbing arrangements.
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Why a five-minute instruction is not a national rule
Some local authorities specify a time for particular fixtures. For example, an Oklahoma Department of Environmental Quality handout labeled February 2021 calls for five minutes of cold water at faucets, starting on the top floor; five minutes of mixed hot and cold water at showers; and a separate five-minute flush at outdoor spigots after disconnecting the hose. It also gives directions for other fixtures. Those are instructions in that local protocol, not a nationwide standard. EPA’s guidance explains why timing can differ by plumbing and outlet.
Read the Oklahoma example in its original context: What to Do After a Boil Advisory. Use its times only if they are part of the directions issued for your location and incident. The fact that it specifies five minutes for some fixtures does not establish that five minutes is right for every fixture, every home, or every advisory.
The distinction is practical: local instructions can be precise because they address a specific jurisdiction’s procedure, while national household guidance leaves the duration to local officials. EPA says timing varies, and CDC’s household FAQ uses a placeholder for the number of minutes. If your utility’s directions differ from the Oklahoma example, follow your utility’s directions.
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When to contact the utility or a professional
- The lift notice is unclear or missing a duration: Ask the utility or local public-health authority whether household flushing is needed, which fixtures to include, and how long to run each one.
- You are unsure whether the notice applies to your home: Confirm the service area and address with the utility instead of relying on a neighbor’s post or an announcement for another area.
- Water remains discolored or a fixture continues to sputter: Follow the local notice and contact the utility if the condition does not resolve as directed.
- You have a connected appliance or treatment unit: Check the utility’s list and the equipment manual for separate cleaning, flushing, filter, disinfection, or regeneration directions.
- You have a complex building system: Ask the building manager and utility for a procedure suited to the building’s plumbing.
- A water heater or treatment unit needs attention: Follow its manufacturer’s instructions or use a qualified professional where the manufacturer or CDC guidance calls for one.
- The situation is not an ordinary lifted boil-water advisory: Follow the authority responsible for the active notice, private well, chemical event, or building-wide remediation. This household checklist does not replace those instructions.
CDC’s household steps are in its Drinking Water Advisory Communication Toolbox. Its broader guidance on household equipment and water heaters is in Preventing Waterborne Germs at Home (March 15, 2024). EPA’s customer FAQ explains the local utility’s role and why flush times depend on plumbing and outlets.
Frequently Asked Questions
When an advisory is lifted, can I immediately drink the water?
The lift notice and any household directions from your utility determine when normal use can resume. EPA says a household may be advised to flush water connected to the service line before normal use if the incident affected the system and water may have entered home plumbing. Check the official notice for your service area; if it does not say whether or how to flush, ask the utility or local public-health authority.
What is flushing, and how do I know if I need to flush the pipes inside my home?
EPA describes flushing as opening valves and faucets and allowing water to flow to remove residual standing water from interior pipes or outlets. Whether you need to do it, which outlets to flush, and how long to run them are questions for the utility’s lift notice and local directions. Timing varies by plumbing and outlet.
How long should I flush my faucets after a boil-water advisory?
There is no universal duration in the reviewed national household guidance. EPA says timing varies, and CDC’s household FAQ leaves the time as “[X] minutes” for local officials to specify. Use the time in your utility’s instructions; do not substitute the five-minute example from another jurisdiction.
Do I need to clean out my faucets?
CDC’s household FAQ says to run faucets after an advisory and gives a general sequence: open hot and cold taps one at a time, starting on the highest floor and moving to the lowest, with adequate ventilation. Follow the utility’s fixture list and duration, since the FAQ does not supply a universal run time.
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What should I do if a faucet sputters or the water looks discolored?
CDC says sputtering can be caused by air in the lines; run the tap slowly until sputtering stops. If water is discolored, its FAQ says to run taps until it clears and not to wash clothes while discoloration remains. Follow incident-specific utility directions, and contact the utility if the condition persists or the next step is unclear. Clear-looking water alone does not prove safety.
My refrigerator has a water dispenser or icemaker. Do I need to clean them?
Yes, CDC’s toolbox FAQ includes separate refrigerator steps. Flush the dispenser for the time local officials provide, discard all existing ice, let the icemaker fill once and discard that batch, clean the ice container, and replace the filter according to the guidance and device instructions. CDC does not give a universal dispenser-flushing duration.
Do I need to do something for the water softener?
A regeneration cycle may be needed, according to CDC’s toolbox. Check the softener’s manual or contact its manufacturer to find out what applies to your unit rather than assuming that every softener needs the same step.
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Should I drain or flush my water heater after every advisory?
No general rule in the cited CDC guidance says every home must drain its water heater after every advisory. CDC says to follow the manufacturer’s instructions when flushing a heater or have a professional do it. Do not use a generic drain procedure unless the manufacturer or local authority directs it.
Does the Oklahoma five-minute instruction apply to my home?
Only if it is part of the directions for your location and incident. Oklahoma’s handout is a local example: it calls for five minutes at certain faucets, showers, and outdoor spigots. EPA says flush times vary, so the Oklahoma times are not a nationwide standard.
What if I live in an apartment or a building with a shared water system?
Ask the building manager and utility what procedure applies to the shared plumbing. EPA’s general customer FAQ does not provide a building-specific flushing procedure, so a household faucet sequence may not cover the building’s system.
The Bottom Line
Use the utility’s official lift notice as your checklist: it determines whether to flush, which fixtures and appliances to include, and the duration. There is no national flush time. CDC gives a general faucet sequence, but connected appliances, filters, softeners, and water heaters may need separate manufacturer-directed steps. If the instructions are unclear, ask the utility rather than guessing.
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