Pet Water After a Flooded Private Well: What the Animals Drink While the Well Is Out of Service

Give your animals bottled water, or water from a supply the flood did not touch, until the well has been evaluated, disinfected and flushed and a laboratory test has come back safe. That usually means one to two weeks or more. Agencies disagree on whether you may use the water before the lab result. This site’s position is to wait for it, because that is the more protective answer and an animal cannot tell you it feels ill.

Nobody sends you a boil water notice for your own well. The water came up, the water went down, the pump still hums and the kitchen tap runs clear. Somewhere in the house are bowls, a circulating fountain with a reservoir, a gravity waterer that holds four days on purpose, and possibly a tank with a heater. Every one of them is plumbed, directly or by way of a jug you fill at the sink, to a hole in the ground that a flood just went through.

This page covers what the animals drink between the flood and the laboratory result, and how long that gap is. It is not about the flood itself or the animal that waded through the yard. Our flood preparedness page for pet households and return-home page cover the floodwater-exposure side. For a well that is running low over weeks of drought instead, see pet water during a drought or water restriction.

Ten bodies publish a well disinfection procedure. Six wrote for the flooded well specifically (EPA, New York State DOH, North Carolina DHHS, Minnesota DOH, University of Georgia Extension and the National Ground Water Association). Four wrote for shock chlorination generally (Pennsylvania DEP, Maine CDC, New Mexico State University Extension and Penn State Extension), which matters because the shortest contact interval comes from one of the general documents. They broadly agree that a flooded well is out of service until evaluated and disinfected. They disagree on how long the chlorine has to sit and on whether the household may use the water after the flush or must wait for a laboratory. Those two disagreements are the reason a household with animals needs a plan that survives whichever document lands in front of it.

First: the pump is an electrical problem

Several of these documents open with the same warning, before any water instruction. EPA’s fact sheet has a boxed warning at the top: “DO NOT TURN ON THE PUMP.” It explains there is danger of electrical shock and damage to your well or pump if they have been flooded. Its closing section adds that rubber boots and gloves are not adequate protection from electric shock, and to consult a certified electrician. EPA’s private wells page (last updated February 26, 2026) and the National Ground Water Association both tell you to stay away from the well pump while it is flooded.

New York State’s Department of Health adds that most private wells have the pump inside the casing, submerged, so owners will probably not be able to inspect it, and should contact a qualified professional such as a registered well driller or pump contractor. If the pump’s control box was submerged, its electrical components should be cleaned and dry before power is restored. New York’s warning: “Do not attempt to clean electrical components without being 100% sure electricity is shut off.”

A household that has just lost its animals’ water supply is under pressure to get the pump running this afternoon. That pressure is what these warnings are written against. Bottled water solves the animals’ problem for a day. An energized control box has no second chance.

What every source agrees on: the well is out of service

• National Ground Water Association. Any well that has been flooded, or is suspected of being influenced by floodwaters, should be viewed as unsafe for potable use until it has been evaluated and tested. Its handout says not to drink or wash with the water and to use an alternative supply such as bottled water. It lists the wells most at risk: older wells now in floodplains, wells whose casing is not finished above the high-water level, and wells not adequately capped or sealed.
• EPA. The fact sheet warns “DO NOT WASH WITH WELL WATER” and says people drinking or washing with water from a flooded private well risk getting sick. It says wells more than 10 years old or less than 50 feet deep are likely to be contaminated even if there is no apparent damage. The absence of visible damage is not evidence.
• North Carolina DHHS. Its flood handout (footer dated 10/2024) says in capitals not to drink water from your well until it has been disinfected and tested.
• Minnesota Department of Health (page last updated 10/18/2024). Water from a flooded well cannot be regarded as safe for drinking or food preparation until the well and plumbing have been flushed and disinfected and a water test shows it is safe.
• New York State Department of Health. Its fact sheet is the only flood-specific well document cited here that names animals in its hazard statement: water in an affected well may contain waterborne pathogens “that can cause serious illness in humans and pets.” It lays out five action steps: assessment, repair, flushing, disinfection and sampling.

That is the frame to hold: five steps, not one afternoon. The step your animals live inside is the gap between the first and the last.

The two disagreements, side by side

The table shows what each document’s own text says. Where a document does not address something, the cell says so.

Issuer and document	How long the chlorine stands	When the household may use the water	Testing timing published
EPA 816-F-05-021, What to Do After the Flood (updated October 2024)	6 to 24 hours; do not drink, cook, bathe or wash with the water in that period	Step 8: the system should now be disinfected and the water can be used	Step 9: test for bacteria 7 to 10 days after disinfection
EPA, Frequent Questions About Flooded Homes (last updated April 2, 2026)	Not addressed	Do not drink or wash with water from the flooded well until it is tested and safe to use	Not addressed
New York State DOH, Flood Recovery: Restoring Water Wells	At least eight hours, preferably 12 to 24	Bottled or disinfected water until testing shows the water is free of contamination	Retest after several weeks recommended
North Carolina DHHS, How to Disinfect Your Well After a Flood (10/2024)	At least eight hours or overnight	After testing, wait for results from the local health department before drinking	Free testing through local health departments
University of Georgia Extension, Circular 1124 (September 8, 2022)	12 to 24 hours; no one drinks or uses the water until the system has been purged	Only after a certified laboratory reports the water safe	After purging three to four well volumes so the added chlorine dissipates
Pennsylvania DEP, Disinfection of Home Wells and Springs	At least four hours, preferably overnight	Until tested and found potable, boil for at least one minute	Once chlorine-free, wait an additional two to five days, then resample
Minnesota DOH (last updated 10/18/2024)	At least 8 hours	Keep boiling until the laboratory reports the water safe	Retest two weeks after a safe result
New Mexico State University Extension, Guide M-115 (October 2025)	At least 8 hours, preferably 12 to 24	Not addressed as a bar; says some chlorine may persist 7 to 10 days and slightly chlorine-smelling water should be usable for most purposes (written for shock chlorination generally)	Sample about 2 weeks after flushing; repeat in 2 to 3 months
Maine CDC Drinking Water Program, Well Shocking Guidelines	A minimum of 12 hours (24 recommended); system unusable except moderate toilet use	Not addressed as a permission	After at least one week for the chlorine to dissipate, sample for total coliform and E. coli at a state-certified laboratory
National Ground Water Association, Flooded Well?	Not addressed	Unsafe until the well has been evaluated and tested	Not addressed

Disagreement one: the contact interval is not one number

The published floors are four hours, six, eight and twelve, and two of the four eight-hour documents (New York and New Mexico State) add a preference for 12 to 24. None of them is wrong. They are different issuers writing for different well populations, bleach strengths and regulatory contexts, and a well owner in Pennsylvania is genuinely being told something different from one in Georgia.

Our page on what a boil water advisory tells you to do shows a similar spread of boil times. The rule there is the rule here: follow the document your own state health department or licensed well contractor gives you.

What is different about a well is that nobody hands you a document. You go looking, find several, and they disagree. This site’s own reasoning, not attributed to any agency: when you hold more than one and have animals to water, plan the alternate supply against the longest interval, not the shortest. An extra day of bottled water costs you a shelf. Guessing short costs you the thing the interval is protecting.

Disagreement two: use the water, or wait for the laboratory

Two EPA documents sit on opposite sides. The fact sheet’s procedure runs: flush the chlorinated water to a safe area away from plants, lakes, streams and septic tanks until the chlorine odor is gone (Step 7), then Step 8, the system should now be disinfected and you can use the water, then Step 9, test for bacteria 7 to 10 days after disinfection. That is use first, test after.

Before any of its steps, the same fact sheet scopes them twice. It says “Drilled, driven or bored wells are best disinfected by a well or pump contractor, because it is difficult for the private owner to thoroughly disinfect these wells.” And it says “The suggestions below are intended to supplement flood precautions issued by State and local health authorities.” So Step 8 is the eighth step of a supplement to state and local precautions, in a procedure EPA says a contractor is best placed to perform, not a free-standing federal permission to resume use.

EPA’s Frequent Questions page (last updated April 2, 2026) puts the test first: do not turn on the pump, and do not drink or wash with water from the flooded well until it is tested and safe to use. EPA’s private wells page (last updated February 26, 2026) opens its flood steps with a bar on drinking or washing from the flooded well but lists no testing step, so it forbids drinking without saying what lifts the ban.

The state health departments and extension services line up with the wait-for-the-lab answer. University of Georgia Extension is the most explicit: even after shock chlorination, do not drink the water until a Georgia DNR-certified laboratory reports it is safe. Minnesota says to keep boiling until the laboratory reports the water is safe. New York says to keep using bottled or disinfected water until testing shows the water is free of contamination. North Carolina says that after testing you need to wait for results from the local health department before using the well for drinking.

This site does not try to resolve that for the agencies. Its own position, labeled as ours: hold the animals on the alternate supply until a laboratory result comes back. The two answers differ only in whether an interval of days is spent on the well or on bottled water, the more protective answer is the one several state health departments and a university extension publish, and an animal cannot report a mild stomach upset or decide to stop drinking. That is a judgment, not a citation.

If your local or state health department gives you an instruction, that one governs, because it was written for your well, your aquifer and your flood. EPA’s own closing line says as much: follow health department drinking and bathing advisories if in doubt.

The animals in the documents

It is a common assumption that nothing published about well disinfection mentions animals. That is not right, though what exists is narrow.

New Mexico State University Extension, Guide M-115 (October 2025). This is the one instruction written for the appliance a modern pet household runs on, inside the procedure itself. Its words: “Provide alternate water sources for pets or livestock who depend on automatic waterers, then make sure the chlorine reaches those outlets.” The order matters. The animals get an alternate supply, and then you deliberately push chlorine through the waterer, because an outlet the chlorine never reaches still carries whatever was in the system. A plumbed auto-refill bowl is a faucet and has to be treated like one. The guide also says that during disinfection the system’s water “is not suitable for consumption or extended contact by people or animals.” Note that M-115 is written for shock chlorination generally, not the flooded-well case, though its bacteriological logic transfers.

New York State DOH names pets once, in the hazard sentence above. That tells you the animals are inside the hazard. It does not tell you what to pour.

Pennsylvania DEP names animals on the disposal side: it asks owners to avoid discharging water with detectable chlorine into storm drains, waterways, ponds and creeks, because “Fish and aquatic animals are very sensitive to very low levels of chlorine and can be killed.” Penn State Extension makes the same point about spring overflow reaching a stream, pond or wetland, warning of environmental damage, “especially a fish kill.”

University of Georgia Extension publishes the strictest bar during the contact window, but words it about anyone drinking or using the water. This page does not widen that to animals, though the practical effect is obvious and NMSU’s sentence covers the same ground in words that name animals.

EPA, NGWA, Maine CDC, Minnesota DOH and North Carolina DHHS are human-scoped throughout the passages used here.

What is not published, and this site’s reasoning

No cited document joins the flood-specific literature (the well is unsafe), the shock-chlorination literature (which names animals and automatic waterers) and the veterinary water-requirement literature into instructions for a household with a dog, a cat and a fish tank. So the following is this site’s own reasoning, assembled from the sources above:

1. A flooded well is out of service for every water-using animal in the house from the moment you suspect it, not from the moment you start the bleach. The hazard NGWA and EPA describe exists before the disinfection does.
2. Every plumbed or refilled animal appliance is inside the system: the auto-refill bowl, the circulating fountain, the gravity waterer you top up at the sink, the misting reservoir, the tank top-off jug. NMSU names automatic waterers explicitly; the rest follow from the same logic, and this is our inference, not an agency’s. It is a reason to stop refilling those appliances from a well you no longer trust. It is not a reason to pour out what is already in them. Water drawn before the flood and sitting in a closed appliance the floodwater never reached is clean water you already own, and it can be the largest reserve in the house. Empty what the floodwater physically reached, and anything filled after you first suspected the well was influenced. Keep the rest and count it toward the alternate supply.
3. The alternate supply has to be planned before the procedure starts. Maine’s Drinking Water Program says this outright, about people.
4. The animals stay on that supply until a laboratory result comes back.

What the animals actually drink, and for how long

The alternate supply, planned before you start

Maine’s Drinking Water Program says an alternate source of drinking water is necessary until the well shocking process is completed, that use of the water system must be minimized because very high levels of chlorine will be present, and that highly chlorinated water should not be used for drinking, bathing or cooking. NGWA says to use an alternative supply such as bottled water. North Carolina DHHS puts bottled water at the top of its list of safe alternatives while the well is untested. For a pet household this is a volume problem before it is a safety problem.

The interim boiling instruction, and the altitude difference

If bottled water is not available, three health departments publish a boiling instruction for the interim:

• North Carolina DHHS: if the water is cloudy, filter it through a clean cloth, paper towel or coffee filter (or let particles settle and draw off the clear water), then bring it to a rolling boil for at least one minute, or three minutes above 6,500 feet. Cool it and store it in sanitized containers.
• Minnesota DOH: bring the water to a full rolling boil for at least one minute. Bottled water is another option.
• New York State DOH: keep a full boil for at least one minute, and it calls boiling the method that produces the safest water.
• EPA’s Frequent Questions page: boil for 1 full minute, and 3 minutes above 5,280 feet.

EPA’s 5,280-foot threshold is lower than North Carolina’s 6,500 feet. Both are published by different issuers and neither corrects the other. If your house sits between those elevations, this site’s own reasoning is to use the longer time, for the same reason as the contact interval: three minutes on a stove is cheap.

Two limits apply to every one of these. Boiling addresses germs, not chemicals. And it is an interim measure for the household, not a treatment for the well. New York says even if your well is operational you should disinfect your water until it is tested and found suitable for drinking.

For treatment gear you would carry rather than run in a kitchen, our comparison of tablets, filters and boiling for pet water covers what those products publish about themselves. That page carries the standing note that federal disinfection dosing is written for human drinking water and does not address giving treated water to animals.

How much, per animal, per day

The Merck Veterinary Manual’s small-animal nutrition chapter (last modified September 2024) says water is the most important nutrient and that a lack of water can lead to death in a matter of days. It says clean, fresh water should be available at all times, and that multiple water sources encourage consumption, which matters for cats that often do not drink much. On quantity it is careful: approaches exist to estimate daily needs, individual variation exists, and the need depends on diet, environment, activity and health. Its figure: “In a thermoneutral environment, most mammalian species need ~44–66 mL/kg body weight.”

Three cautions on that sentence. It is one range for mammals generally, not a separate dog figure and cat figure. It does not extend to birds, reptiles or amphibians. And the quoted sentence does not contain the words per day; the daily framing comes from the sentences before it.

The unit is metric per kilogram, so a conversion is needed. That conversion is arithmetic, not a citation, and it is this site’s own: 44 to 66 millilitres per kilogram works out to roughly 0.67 to 1.01 US fluid ounces per pound of body weight. A 60-pound dog lands around 40 to 61 fluid ounces a day by that range, roughly a third of a gallon to just under half a gallon, before you add anything for heat, activity or a dry diet. Merck notes that dogs and cats eating mostly canned food generally drink less water than those eating mostly dry food, since canned food carries far more moisture.

Merck also says healthy animals with ample water can self-regulate their intake and that water intake should not be restricted. Rationing an animal’s water to stretch a supply is not a plan. Buying more water is the plan.

Our page on how much water to store per animal works the storage arithmetic, and the long-term pet food and water storage guide covers containers and rotation at the scale a multi-week outage needs.

Rabbits are different. Merck’s rabbit nutrition chapter says metabolic studies show “a rabbit will consume water at a rate of approximately 120 mL/kg/day.” Merck adds that this is about twice the amount usually calculated for an equally sized dog or cat. A rabbit household that sizes its bottled water from the mammalian range will buy roughly half of what Merck’s rabbit figure implies. Size a rabbit from the rabbit chapter.

Birds and reptiles. No source cited on this page publishes a daily drinking-water volume for birds or reptiles. Ask the exotics practice that already sees them, in advance, and write the number next to the practice’s after-hours line. This site will not scale a mammalian range across that gap.

How many days to buy for

Not two. The waits below are published by the agencies, not estimated here:

• EPA: test for bacteria 7 to 10 days after disinfection.
• New Mexico State University Extension: sample approximately 2 weeks after flushing the system, and repeat the test in 2 to 3 months to be sure the system has not been recontaminated. It notes some chlorine may persist 7 to 10 days and that slightly chlorine-smelling water should be usable for most purposes. This is a shock-chlorination guide, and the flood-specific documents here do not treat a faint chlorine smell as the signal that water is fit for an animal.
• Penn State Extension: retest for total coliform approximately 10 to 14 days after disinfection. If none is present, wait an additional two to three months and test again. If bacteria return in either test, a continuous disinfection treatment system will be necessary.
• Pennsylvania DEP: once the water source is chlorine-free, wait an additional two to five days and then resample.
• Maine CDC: wait at least one week for the chlorine to dissipate before sampling. The laboratory will likely reject a sample with even a trace of chlorine, so Maine recommends a chlorine residual test kit first.
• Minnesota DOH: once a safe result arrives, test again in two weeks to confirm the disinfection was completely effective.
• New York State DOH: consider retesting after several weeks, since with extensive flooding and groundwater contamination the well may be susceptible to recontamination for some time.

The front end of the job is not instant either. New York says pumping times before disinfection vary with the size and depth of the well and the extent of contamination, from thirty minutes to several hours or days.

How long a laboratory takes is a separate question and depends on where you are and what just happened. There is no national figure. North Carolina Health News (October 21, 2024) reported a western North Carolina well driller saying that after Hurricane Helene it generally took almost a month to get a water panel tested through the state, with mobile testing in Buncombe County possibly helping. The article notes private labs were helping work through the county’s backlog. That is one driller’s account of one disaster in one state. On October 31, 2024, EPA’s Region 4 office announced free sampling kits through state and local health departments and two mobile water laboratories in western North Carolina, saying testing your well water is the only way to know if the storm caused harmful contamination.

Planning conclusion, stated as ours: buy for the agency-published waits, which run one to two weeks at minimum before a first test even makes sense, then add whatever your own local health department says its turnaround is. Call and ask on day one, not on day nine.

The flush water in the yard

Every one of these documents tells you to get the chlorinated flush water away from things, but each names its own list. EPA says to run it into a safe area away from plants, lakes, streams and septic tanks. Minnesota says to avoid running chlorinated water into a septic system or onto lawns or gardens, while allowing the small amount flushed from the pipes to run into a septic tank. New York says to use an outdoor faucet and hose in an area away from grass and shrubbery until the chlorine odor disappears. New Mexico State says to direct water flushed from a sprinkler or drip system away from landscaping plants and lawn areas. University of Georgia warns that highly chlorinated water in a septic tank could upset its beneficial bacteria. Maine names the longest list: septic systems, nearby lakes, rivers, ponds, any surface waters, lawns, gardens and sensitive plants.

Plants, lawns, septic tanks, streams. Only Pennsylvania DEP names animals, and only aquatic ones, which is the warning above. If you keep a pond, a water feature with fish, or a tank topped up from an outdoor spigot, plan the discharge route first. Our page on keeping a tank alive through an emergency covers the tank’s own failure modes, and the chloramine and dechlorination side of tank water is on our boil water advisory page.

None of these documents mentions the land-animal version: a flush runs until the chlorine odor is gone, which can mean a hose running for a long time into a corner of a yard, leaving standing water a dog may find interesting. So this is the site’s own reasoning, not an agency instruction:

Keep animals out of the discharge area for the whole flush and until it has drained and dried, and do not let a dog work a hose end during one. The chain is short. The water from that hose is water NMSU says is unsuitable for consumption or extended contact by people or animals, water Pennsylvania DEP says can kill aquatic animals at very low concentrations, and the flush starts at the concentration nobody wants anything drinking. Confining the animals removes the question. If you are following EPA’s or Minnesota’s instruction and picking a spot away from the garden, pick one the animals do not use either.

What disinfection does not fix

Chemicals are a different problem. EPA says on the same fact sheet as the steps that well disinfection will not protect against pesticides, heavy metals and other non-biological contamination, and that special treatment is required if such contamination is suspected. EPA also tells owners who see chemical containers, including barrels and drums, that have moved onto their property to call their state or county health department or the Superfund hotline.

New York State DOH separates the two at the top of its fact sheet, which addresses possible pathogen contamination. It adds that drinking water wells can also be contaminated by fuel oil or other chemicals released during the flood (such as from home oil tanks and agricultural tanks). If you believe your well may be contaminated by petroleum or other chemicals, it says not to use the well and to contact your local health department immediately, or the state spill hotline. Pennsylvania DEP scopes its procedure as a temporary homeowner measure for bacteriological contamination, not including the organisms that cause giardiasis or cryptosporidiosis.

For a pet household the translation is short. If you suspect fuel, heating oil, an agricultural chemical or an industrial release rather than bacteria, boiling is not an interim answer and disinfection is not a fix. That means bottled water for every animal in the house and a call to your health department. Our boil water advisory page explains why boiling can be the wrong move when chemicals are involved.

The aquifer keeps its own schedule. EPA’s caution box says that, because of the extensive flood area and the speed and direction of groundwater flow, your well may not be a safe source of water for “many months after the flood.” Waste water from malfunctioning septic tanks or chemicals seeping into the ground can contaminate groundwater even after a test found it safe, so EPA says long range precautions, including repeated testing, are necessary. A clean first result is a milestone, not an all-clear.

Shock chlorination is not permanent. Penn State Extension says that when done properly, shock chlorination will kill all the bacteria existing in a well. But in a Penn State study of wells contaminated by coliform bacteria, shock chlorination plus a sanitary well cap removed the bacteria for one year in only 15 percent of the wells. It worked best in wells with fewer than 10 coliform colonies per 100 mL and no E. coli. New Mexico State explains the mechanism: if the groundwater itself is the source of bacteria, the system will be contaminated again when that water is pumped into the plumbing, and continuous chlorination or another disinfection method will be necessary.

For a household with animals that is a planning fact. A well that flooded once can flood again, follow-up testing runs for months, and the stored-water habit that got you through this event gets you through the next. If a retest comes back positive, call your local health department and a licensed well contractor rather than adding another round of bleach on your own judgment. Our pet food and water storage page covers rotation.

The animal that was in the floodwater

This is a boundary, not a full treatment, because it belongs to a different page and the two problems arrive on the same day.

Louisiana’s Department of Health publishes a pet-specific floodwater fact sheet (revised 3/16/2016). It says pets should be prevented from entering or drinking floodwaters. It says washing a pet after exposure can prevent skin infections and remove floodwater contaminants. Ask your veterinarian how to wash an animal that was in floodwater. The fact sheet says dogs exposed to floodwaters should be vaccinated against leptospirosis, available at most veterinary practices, and that pets should be up to date on vaccines such as rabies. If a pet has ingested floodwater, vomiting or diarrhea may result, and the fact sheet says to seek veterinary care if it does.

Two practical notes. First, the bath needs water, and if your well is the source, the bath is inside the same problem as the bowl. Maine’s instruction not to bathe in highly chlorinated water and EPA’s warning about washing with flooded-well water both apply to washing an animal. Plan bath water into the alternate supply. Second, an animal that has already ingested floodwater is a veterinary question, not a water-planning question. Call your veterinarian. Our flood preparedness page covers the exposure side, and our return-home page covers bringing animals back into an affected house, including the water and bowls step.

Where this page sits next to the rest

The municipal tap and an advisory. Your water comes from a utility and an agency has told you not to drink it. That is a different document set, including advisory types where boiling is the wrong move. See the boil water advisory page.

The well with no power. The water is fine and the pump cannot lift it. That is an outage problem measured in hours to days, and the fix is stored water. Our power outage page for pet households covers the well-pump case, and our page on an electric well pump and your pets’ water works the same case quantitatively, including why agencies tell a well household not to draw the pressure-tank reserve during an extended outage. If a storm took your power and flooded your well, you are in both pages at once: pre-fill from that one, then run the test-and-disinfect cycle from this one. The per-animal arithmetic is on our water-per-animal page.

Field water and go-bag treatment. Tablets, portable filters and boiling for water you did not draw from your own plumbing: see the pet water purification comparison.

This page. The well is yours, nobody issues a notice, the tap may still run and look normal, and the fix is measured in weeks.

Your flooded-well pet water checklist

• Treat the well as out of service for every animal the moment you suspect floodwater reached or influenced it, before you touch anything.
• Do not turn on the pump. EPA and NGWA both open with that. Get an electrician, a registered well driller or a pump contractor to clear it.
• Buy or haul the alternate supply first, before starting any procedure. Maine says the alternate source is necessary until the process is completed; NGWA and North Carolina DHHS name bottled water.
• Size that supply from your own animals’ weights and the published waits. Merck’s mammalian range is 44 to 66 mL/kg, which by our conversion is roughly 0.67 to 1.01 fluid ounces per pound, and agency testing waits start at one to two weeks. For a rabbit, use Merck’s separate figure of approximately 120 mL/kg/day. Add a separate allowance for bathing any animal that was in the floodwater, in a second container so a bath cannot be taken out of the drinking supply. No cited document publishes a bath volume, so size it against your animal.
• Stop refilling every plumbed or refilled animal appliance: auto-refill bowls, circulating fountains, gravity waterers, misting reservoirs. Empty any appliance the floodwater reached and any filled after you first suspected the well. Keep water that was in a closed appliance before the flood and count it toward the alternate supply.
• If you have automatic waterers, follow New Mexico State’s order: alternate water for the animals first, then make sure the chlorine reaches those outlets during disinfection.
• Plan the flush discharge route before the flush, and pick a spot the animals do not use. If you keep fish or a pond, this is what Pennsylvania DEP’s aquatic-animal warning is written for.
• Keep animals confined away from the discharge area for the whole flush and until it has drained and dried. That is this site’s recommendation, not a published instruction.
• Read EPA’s scoping of its procedure before treating its steps as clearance: drilled, driven or bored wells are best disinfected by a well or pump contractor, and the steps supplement state and local precautions.
• Note the contact interval your own document publishes, and plan against the longest interval you hold. Published floors range from four hours to twelve.
• If you must use well water in the interim, follow the boiling instruction your state health department publishes, and use the longer time if you sit between the published altitude thresholds. Boiling addresses germs, not chemicals.
• If you suspect fuel, heating oil, an agricultural chemical or an industrial release, do not disinfect and do not boil. Use bottled water for every animal and call your local health department, as New York State DOH instructs.
• Call your local health department on day one and ask its current testing turnaround and whether free sampling kits are available.
• Keep the animals on the alternate supply until a laboratory result comes back.
• Put the follow-up tests in a calendar: a retest at 7 to 10 days, 10 to 14 days or about two weeks depending on your document, then again at two to three months.
• If an animal drank floodwater or well water before you realized, or shows vomiting, diarrhea or lethargy, call your veterinarian. Louisiana’s Department of Health names ingestion of floodwater as a reason to seek veterinary care.
• If you keep birds or reptiles, write your exotics practice’s number next to your veterinarian’s, because the mammalian range does not cover them.

The version you do on a quiet afternoon

Find out who tests water where you live, and how many days it takes. EPA’s private wells guidance says to test immediately when conditions near the well have changed significantly, and names flooding first. Have your county or state health department’s number, and ask about turnaround. During a disaster that answer changes, which is why you want the baseline beforehand.

Know your well. Depth, casing diameter, age, whether the cap is watertight and vermin proof, and where a flush discharge would go. EPA’s risk note is that wells over ten years old or under fifty feet deep are likely to be contaminated even without apparent damage. New York State DOH lists physical improvements that reduce the risk next time, including extending the casing above the expected flood level and installing a watertight and vermin proof well cap.

Store water for the animals as a standing habit. Every document here assumes an alternate supply exists, and none says where to get one at short notice in a county that just flooded. Our pet food and water storage page covers containers and rotation, and our per-animal water math turns your household into a number.

Then do the smallest thing on this list, which is also the one most likely to matter. Write your animals’ weights on the same page as your veterinarian’s number and your health department’s number.