The Electric Well Pump Stops Instantly: The Numbers That Decide What Your Animals Drink

A well pump stops the instant the power does, and the small reserve left in the pressure tank is not a supply to plan around. Michigan’s environmental agency tells well owners not to draw it down during an extended outage, because doing so depressurizes the system and raises the risk of contamination, and the contamination can be invisible. So keep stored water for the animals, and if you have none, use water that does not come from your well. The rest of this page gives the numbers behind that: how much water the tank holds, what the pump draws, and why the usual backup power will not start it.

The power goes out at nine at night. Somewhere in the house are three bowls, a cat fountain, a fifty-five gallon tank with a filter, and a dog that drinks half a bowl every time she comes in from outside. On municipal water, none of that is urgent, because the tap still runs. On a well, the tap stopped when the lights did, with no warning. The next person who turns the kitchen faucet gets a few seconds of water at falling pressure and then air.

Three quantities decide what follows: how much water is genuinely left in the system, whether you should use it, and what it would take, electrically, to start the pump again. Each has a published answer from a manufacturer or an agency.

What this page adds

Our pets and power outages hub already says the electric well pump is one of the household dependencies that genuinely needs backup power, and that the fix is stored water rather than improvisation. Our inland hurricane page tells readers to plan for the drawdown rather than the tank, and our generator versus power station comparison names a well pump as a load where a fuel generator earns its place. This page publishes the numbers those pages lacked: gallons of drawdown, watts of a well pump, and what a machine would have to be to start one. It reaches one conclusion they could not, and it is about voltage rather than capacity.

Two boundaries. This page does not size your animals’ water supply; that arithmetic lives on how much water per dog in an emergency. And it covers a well whose water is fine and whose pump has no electricity. A flooded or contaminated well is a different hazard with a different clock: see pet water after a flooded private well. For a water table declining over a drought, see pet water during a drought or water restriction.

The pump stops instantly, and the first action is a breaker

There is no buffer between the outage and the pump. PrivateWellClass.org, a collaboration between the Rural Community Assistance Partnership and the University of Illinois through the Illinois State Water Survey, says: “If you have an electrical well pump, you cannot pump water from your well during a power outage.” The Ohio Department of Health (page dated August 28, 2018) says the same from the system’s side: pumping systems will not operate and a limited quantity of water is stored in the pressure tank and water lines. Ohio also notes that private water systems in that state include springs, rainwater cisterns and ponds, which changes some households’ answers.

The first action is not about water. PrivateWellClass and NEHA’s Private Water Network both tell owners to cut power to the pump. PrivateWellClass says to turn the power supply off so the pump does not start automatically when power is restored, and to label your circuit box in advance so you know which breaker to switch. NEHA, in a factsheet produced under a CDC cooperative agreement, says to turn off power to the well pump before inspecting the area around the well, because of the danger of electrical shock and damage to the drinking water system. Its Before a Power Outage list carries the same step and notes the switch may be by the pump or tank, or at the main panel.

For a household with animals this matters for an unglamorous reason. When power returns, an unattended pump restarts into a system that may have sat depressurized for hours, and the person who would notice is asleep or at work. Cutting the breaker makes the restart a decision rather than an event.

Everything about breakers, transfer switches and generator connections here describes what manufacturers and agencies publish. It is not an instruction to perform electrical work. That belongs to a licensed electrician or well contractor.

What the tank actually holds: drawdown is not tank volume

A pressure tank is not a water tank. Penn State Extension says it is, in a sense, a storage tank, but with very limited storage capacity, and that its primary purpose is to create and maintain pressure on the water in the pipeline. PrivateWellClass explains that the pump runs when pressure falls below a preset low level, generally 20 to 40 PSI, and stops when it reaches a preset high level, generally 40 to 60 PSI. The water that leaves the tank between those two pressures, with the pump off, is called drawdown, and it is a published specification.

The current numbers, by named model

Amtrol makes the Well-X-Trol line of residential well tanks. On its specification card, form MC7025 (03/24), tank volume and drawdown are separate columns, and drawdown is given at three pressure-switch settings.

Model (Amtrol Well-X-Trol)	Tank volume, gallons	Drawdown at 30/50 psig	Drawdown at 40/60 psig	Drawdown at 50/70 psig
WX-201	14.0	4.3	3.8	3.3
WX-202	20.0	6.2	5.4	4.7
WX-202XL	26.0	8.0	7.0	6.1
WX-203	32.0	9.9	8.6	7.6
WX-250	44.0	13.6	11.8	10.4
WX-251	62.0	19.2	16.6	14.6
WX-350	119.0	36.8	31.9	28.1

The card carries Amtrol’s own caveat, which belongs with the numbers wherever they travel: “Drawdown can be affected by various ambient and system conditions, including temperature and pressure.” It also gives the factory precharge as 38 psig and the maximum working pressure for all models as 150 psig.

Three observations, all this site’s arithmetic on Amtrol’s table:

• Drawdown runs close to 27 percent of tank volume at a 40/60 switch across the whole residential range, from the 14 gallon WX-201 to the 119 gallon WX-350. A household that knows only its tank’s nominal size can estimate within a few gallons.
• The switch setting moves the answer by roughly a quarter. The WX-250 gives 13.6 gallons at 30/50 and 10.4 at 50/70. Higher house pressure buys less reserve. The gauge near the tank shows your setting.
• Someone who believes they have a 44 gallon reserve and actually has 11.8 has made a four-fold error.

A second figure, from an extension service, that does not match

Penn State Extension says: “About 20 percent of the capacity of the pressure tank contains usable water.” Its worked examples: a 42-gallon tank discharges about 8 gallons before the pump starts, an 82 gallon tank 16 gallons, a 120 gallon tank about 24. It concludes that larger pressure tanks alone provide only slightly more stored water, not enough to solve problems with a low-yielding well. Buying a bigger tank is not a water-supply strategy.

That works out to roughly 19 percent, against Amtrol’s roughly 27 percent at 40/60. This site’s reading, not a claim either source makes: the Penn State passage describes a plain air-over-water tank on a 20/40 switch, while Amtrol’s table is for diaphragm tanks with a sealed air charge at 30/50 and above. PrivateWellClass’s tank article describes the same generational difference, noting that in the original design air can dissolve into the water, and that most new tanks are bladder tanks with a permanent separation. The two figures should not be averaged. Look up your own tank’s model number, and if your tank is old enough to be an air-over-water design, expect the lower end. Check your model against Amtrol’s current form rather than an older document.

Why this page does not turn either figure into days of pet drinking water

The obvious arithmetic is to take the drawdown, take a per-pound daily water rate for a dog, divide, and publish a number of days. This page does not, because Michigan’s Department of Environment, Great Lakes, and Energy tells a well owner not to withdraw that water during an extended outage. Chester County, Pennsylvania publishes the same instruction in closely tracking wording, so treat it as one instruction carried by two jurisdictions, not two independent findings. Publishing a ration out of a reserve an agency says not to open would mean telling you to do that thing, to an animal that cannot report the consequence.

What the drawdown figure is for is different and still valuable: it tells you how fast normal household use will empty the system, and so how much time you have before the decision below is forced on you. Penn State’s Table 1 gives a standard toilet at 5 gallons per flush, a low-flush toilet at 1.6, and standard faucets and showerheads at 3 gallons per minute. Against a WX-202’s 5.4 gallons at 40/60, one standard flush is nearly the whole reserve, one low-flush flush is roughly 30 percent of it, and a five-minute shower at Penn State’s standard rate is about three times the whole thing. That arithmetic is ours, joining two tables not written to be read together. The animals are not what empties the tank. An ordinary evening of normal household behavior is, and it happens before anyone has thought about the bowls.

The paragraph this page exists for

Michigan EGLE’s two-page fact sheet, Protecting Your Private Water Supply in an Emergency (04/2020), has a short power-outage section that is the most consequential thing here for a pet household on a well.

It begins with the mechanism most owners have never been told. Normally the electric pump draws groundwater and maintains pressure in the storage tank and piping, and that pressurization forms a physical barrier that protects the drinking water against the entrance of contaminants. During an outage a well system loses pressure if faucets are opened, and bacteria, viruses and other disease-causing organisms can find their way into the water system. The water “can become contaminated without any noticeable change in taste, odor, or clarity.” The failure is invisible: no cloudiness to check for, no smell to catch.

Then the instruction: “During extended power outages it is important to refrain from opening faucets, taking showers, or flushing toilets.” Michigan acknowledges the reserve in the same sentence: the system may have several gallons in storage, but withdrawing water while the power is out depressurizes the system and increases the risk of contamination. The gallons are real, and the agency’s position is that spending them is what creates the hazard.

If the system loses pressure completely

Michigan escalates to testing when the system runs dry. If all pressure is lost, it is a good idea to have the water checked for coliform bacteria. Its temporary water supply section is firmer: a system depressurized during an interruption of electrical power should not be consumed “until testing has verified that it is potable (fit to drink).” The water is considered safe after two consecutive samples, collected 8 hours apart, show no coliform bacteria. That is a minimum of eight hours between samples, plus laboratory turnaround on both, plus getting sample bottles. A household that draws its tank dry on the first night is not back to normal when the power returns.

Chester County publishes closely matching guidance, which tracks Michigan’s wording on the mechanism. It says that if the system loses all pressure you should check water quality before continuing to consume it, and that disinfecting your well may also be advisable. It adds a step Michigan does not: flush all lines, letting the water run for a few minutes, before drinking, and test the water before drinking if there are concerns the treatment system is not functioning properly. A county relaying a state fact sheet is a relay, not a separate authority.

The treatment system is off too

Ohio adds a hazard the others do not. The Ohio Department of Health says: “Treatment units also need electricity and will not perform the function of treating the water, making the water unsafe for drinking.” That applies to anyone whose well runs through an ultraviolet unit, a chlorine injection system or any powered treatment stage. On those systems the water reaching the tap during an outage has not been treated, regardless of pressure. If your water is treated on the way in rather than clean at the source, an outage removes the treatment before it removes the pressure.

The join, and it is this site’s own

No single document states this, so it is labeled as this site’s reasoning. PrivateWellClass’s method for getting water out during an outage is a faucet at the bottom of the tank. That works by deliberately draining the tank. Michigan’s rule is that a fully depressurized system should not be consumed from until two clean coliform samples come back. Together, the method for obtaining water is also the method that triggers the testing requirement, and the last of the water you draw is the water most likely to be what Michigan did not intend you to drink. None of the documents cited here weighs that for an animal. In our view the reserve in the tank is worth understanding so you know how little time you have, and it is not a plan for filling bowls. The plan for filling bowls is water you already stored.

And if you did not store any

None of these documents weighs a night of thirst against a bacterial risk, and neither can this page. What we will not do is tell you to leave an animal without water while the question stays open. Our page on how long a dog can go without water carries the site’s position on the other side of that trade.

This is our reasoning, not any agency’s instruction: the water you are looking for tonight is water that does not come from the well. Sealed bottled water already in the house. Containers someone filled before the outage. A neighbor, relative or store on municipal water, where the tap does not depend on your electricity. Any of those is off the well and outside the depressurization question. This page will not give a way to make the well water itself safe: disinfection is a contractor and health department procedure with its own concentrations and hold times.

Where the sources disagree

Five publishers address a private well during a power outage, and they do not give the same answer to the most basic question. None addresses giving the water to an animal.

Source	May you draw from the pressure tank during the outage?	Testing afterwards	What to store beforehand
Michigan EGLE (04/2020)	No, for extended outages	Coliform check if all pressure is lost; do not consume after depressurization until testing verifies it is potable; two consecutive samples 8 hours apart	Bottled water; a few 5-gallon pails of water for toilet flushes and other nonpotable uses
PrivateWellClass.org (March 19, 2026)	Yes; the tank should have a faucet near the bottom	Not addressed in this article	Follow CDC emergency water guidance; consider generator or solar backup connected to the pump
Ohio Department of Health (August 28, 2018)	Not stated either way; a limited quantity is stored, and unpowered treatment units make the water unsafe for drinking	Not addressed	Not addressed
Chester County (PA) Health Department	No, for extended outages; wording closely tracks Michigan’s	Check water quality if all pressure is lost; disinfection may be advisable; flush lines before drinking; test annually	Not addressed
NEHA Private Water Network	Not stated either way; use a safe source such as bottled water during an outage	Test at a certified laboratory after an outage; use bottled or stored water until results confirm safety	Water for drinking, cooking, bathing and flushing for three days

The disagreement between the first two rows is real and neither party is careless. PrivateWellClass introduces its tank option by saying options depend on the length of the outage, and Michigan attaches its prohibition to extended outages. Both appear to think duration matters, and neither publishes a threshold for where “extended” starts. Reading them as compatible for short outages and incompatible for long ones is this site’s reading, not a reconciliation either publisher offers, and it leaves the reader without the one number that would settle it. The PrivateWellClass sentence is: “If you have a pressure tank, you can use the water in it.”

The last point matters most to a reader of this site. In every document cited on this page, including Penn State’s low-yielding wells publication and both PrivateWellClass articles, nothing addresses giving the water to a pet. Other publishers may have written pet-specific guidance not cited here. The conservative reading is the right one: whatever a document says a person should not drink is not a bowl you should fill, and your veterinarian can weigh your specific animal against the specific reason your water is in question.

What the pump draws, from the motor manufacturer

Now the electrical half, where this page’s conclusion lives. Our generator sizing worksheet tells readers to read each device’s own plate, and our watt-hour budget calculator declines to supply typical figures. Both positions stand. The figures below are not typical values. They are the motor manufacturer’s own published specifications, per named model prefix. Nothing here should be applied to a motor whose plate you have not read.

Table 29, by model prefix

Franklin Electric’s AIM Manual (2023 edition) is the application manual for its submersible motors. Its Table 29, “4-inch / Single-Phase / Encapsulated Motor Specs / 3450 RPM,” gives, for each model, full load and maximum load amps and watts, locked rotor amps and a KVA code.

Model prefix (Franklin AIM 2023, Table 29)	HP	Volts	Type	Full load	Maximum load	Locked rotor amps	KVA code
244504	1/2	115	4” 2-wire	10.0 A, 670 W	12.0 A, 960 W	64.4	R
244505	1/2	230	4” 2-wire	5.0 A, 670 W	6.0 A, 960 W	32.2	R
244507	3/4	230	4” 2-wire	6.8 A, 940 W	8.0 A, 1310 W	40.7	N
244508	1	230	4” 2-wire	8.2 A, 1210 W	10.4 A, 1600 W	48.7	N
244309	1.5	230	4” 2-wire	10.6 A, 1710 W	13.1 A, 2280 W	66.2	M
224301	2	230	4” 3-wire	2025 W	2555 W	53.1	G

Franklin’s note travels with every figure from this table: “Performance is typical, not guaranteed, at specified voltages and capacitor values.” Its wording continues that performance at voltage ratings not shown is similar, except amps vary inversely with voltage. The running figure is smaller than the folklore, which is why the wattage question alone has always made a well pump look reachable.

The 115 volt exception

Well pumps are not all 230 volt devices. Model prefix 244504 is a 1/2 HP 115 volt 2-wire motor. Its running watts equal its 230 volt sibling’s, 670 W full load and 960 W maximum, because the power is the same either way. What changes is current: full load amps double from 5.0 to 10.0, and locked rotor amps double from 32.2 to 64.4. Halve the voltage and, for the same power, the amps double. So the one residential configuration where the voltage objection below does not apply is also the one with the largest inrush current for its horsepower.

Two tables in one manual that do not agree

That is why a bare figure for “a 1 HP well pump” is not publishable. Franklin’s Table 30 covers the same nominal horsepowers for motors with a G suffix, and the figures differ. The 1 HP 230 volt 2-wire model reads 1210 W full load, 1600 W maximum and 48.7 locked rotor amps in Table 29, and 1215 W, 1630 W and 47.6 in Table 30. The 1/2 HP 230 volt 2-wire model reads 670 W and 32.2 locked rotor amps in Table 29, and 660 W and 28.5 in Table 30. Neither table is wrong; they describe different products. The figure that governs your decision is the one printed on your unit, and horsepower alone does not identify a motor.

Locked rotor amps are amps, not watts

Locked rotor amps is a current figure. Multiplying by the supply voltage gives volt-amps, which is apparent power, not watts. At the moment a motor starts its power factor is low, so the volt-amp figure is meaningfully larger than the real power drawn. Comparing an amps-derived figure against a generator’s or power station’s watt rating compares two different quantities. Franklin avoids this with a separate table in the units generators are rated in.

What Franklin says a generator has to be

The AIM Manual’s Engine Driven Generators section is the motor manufacturer’s own answer to the question this page exists to settle. It says generators must be sized to deliver at least 65% of the motor’s rated nameplate voltage during starting, to ensure adequate starting torque. A generator that sags below that during inrush fails to develop the torque to start the pump at all.

Table 3, Generator Minimum Rating, carries this note: “For best starting of 2-wire motors, the minimum generator rating is 50% higher than shown.” The note also says the table applies to 2-wire, 3-wire or 3-phase motors.

Motor rating (Franklin AIM 2023, Table 3)	Minimum generator rating, KW	Minimum generator rating, kVA
1/3 HP	1.5	1.9
1/2 HP	2	2.5
3/4 HP	3	3.8
1 HP	4	5.0
1.5 HP	5	6.25
2 HP	7.5	9.4

Applying Franklin’s 50 percent note to the 2-wire residential motors is this site’s arithmetic: 1/2 HP goes from 2 KW to 3 KW, 3/4 HP from 3 to 4.5 KW, 1 HP from 4 to 6 KW, and 1.5 HP from 5 to 7.5 KW. Whether the uplift applies to your pump depends on whether its motor is 2-wire or 3-wire, which the model prefix in Table 29 shows and horsepower alone does not.

Three further instructions from that section are safety statements:

• Connection. Franklin says that “automatic or manual transfer switches must be used any time a generator is used as standby or back up on power lines,” to prevent accidental electrocution, and to contact the power company for use and approval.
• Sequence. Start the generator before turning on the motor, and turn off the motor before shutting down the generator. Franklin’s reason is that the motor’s thrust bearing may be damaged if the generator coasts down with the motor running or runs out of fuel, a real risk when refueling happens in the dark.
• Soft starters. If you have been shopping for a device that promises to let a smaller generator start a pump: Franklin says not to use a reduced voltage starter with a minimum-sized generator, because both reduce output voltage and combining them risks severe motor damage from low voltage. It adds that a minimum-rated generator already acts as a soft start and that no additional voltage reduction is allowed.

So devices that reduce a pump’s inrush exist and Franklin addresses them, but it does not treat one as a substitute for adequate generator capacity. Franklin’s guidance is written for engine driven generators with voltage regulators. It does not address battery inverters or portable power stations, and this page does not extend it to them.

Set against the backup power this site recommends

Our power station roundup compares five battery stations for pet loads, and our generator versus power station page uses the Honda EU2200i as its quiet-generator benchmark. Franklin’s tables confirm the category call, an engine driven generator rather than a battery. They do not confirm that particular machine.

The voltage finding

Every 4-inch single-phase model in Franklin’s Table 29 from 3/4 HP upward is a 230 volt motor. Only the 1/2 HP appears with a 115 volt option. Here is what the manufacturers of the machines this site recommends publish about their own AC output:

Product (manufacturer’s published AC output)	Rated AC output	Surge	Voltage as published
Honda EU2200i inverter generator	1800 W rated (15 A)	2200 W max. (18.3 A)	“120V 2200W max. (18.3A), 1800W rated (15A)”; receptacles 20A 125V Duplex
Jackery Explorer 2000 Plus	3000 W max	6000 W surge peak	“(4x) 120V~ 60Hz, 20A Max (1x) 120V~ 60Hz, 25A Max”; 120/240V described as expandable through parallel connection
EcoFlow RIVER 2 Pro	800 W total	1600 W	120V
Anker SOLIX C300	300 W rated	600 W with SurgePad	120V

The finding is about these products, not their categories: none outputs 240 volts as a single unit, so none can supply a 230 volt motor at any wattage. Jackery is explicit that 240 volt output on the Explorer 2000 Plus is reached by connecting units in parallel, and Honda describes the EU2200i as a 2200 watt 120 volt inverter generator. A 230 volt pump is not a big load. It is a load your 120 volt machine cannot reach by getting bigger.

The wattage finding, for the one case where voltage is not the answer

For the 1/2 HP 115 volt motor, prefix 244504, the voltage objection does not apply, so wattage is the live question. Franklin’s Table 3 puts the minimum generator for a 1/2 HP motor at 2 KW, and 3 KW for the 2-wire version after the 50 percent uplift. The Honda publishes 1800 W rated and 2200 W maximum, the Anker C300 publishes 300 W rated, and the EcoFlow RIVER 2 Pro publishes 800 W total. All three are below the 3 KW figure, and only the Honda’s maximum reaches the 2 KW figure, not its rated output. The Jackery at 3000 W maximum is the only one that meets 3 KW, and meeting a manufacturer’s stated minimum is not the same as a manufacturer saying the combination will work.

This page will not tell you any of these will start any pump. Franklin’s guidance is about engine driven generators, its 65 percent voltage requirement is a behavior under load that no product page publishes, and the decision belongs to a licensed well or electrical contractor who can see your motor, wire run and machine. For a 230 volt pump the answer is no on voltage grounds. For the 115 volt exception it is a question for a professional.

What this section does not say

It does not say no power station can run a well pump; it says the specific products this site recommends, at their published outputs, cannot supply a 230 volt motor. Larger equipment exists, including Jackery’s parallel configuration, which this page does not evaluate. It does not say a generator is the wrong tool: Franklin’s Table 3 is a generator table, and NEHA suggests considering connecting your well pump to a generator if you have frequent outages. PrivateWellClass similarly recommends a generator or solar panels connected to the pump for rural or outage-prone areas. And it says nothing about running a generator around animals. Carbon monoxide, placement distance and alarms are covered on our generators, carbon monoxide and pets page.

So the answer is water you stored before the outage

The documents converge on one instruction from four directions. Michigan says not to draw the system. Ohio says treatment is off. NEHA and PrivateWellClass say to use bottled or stored water. Franklin says what it would take to run the pump instead, and it is a contractor-scale answer rather than a shopping one.

The three-day figure, at its real scope

NEHA’s factsheet gives the only stored-water duration in any of these documents: “Buy or store safe water, such as bottled water, to use for drinking, cooking, bathing, and flushing toilets for three days.” It names people’s uses and no animal. Extending a three-day human figure to pets is this site’s own step, flagged here rather than quietly inherited.

Michigan’s temporary supply list adds a distinction worth copying: bottled water for drinking, and a few 5-gallon pails of water stored in the basement for toilet flushes and other nonpotable uses. Two grades of stored water, with the drinking grade kept separate, stops the flushing from eating the drinking supply.

Sizing is a different page’s job

How much water a household of animals needs per day is a contested question. How much water per dog in an emergency covers where the commonly cited per-pound rate comes from, which bodies publish a day count, and the container criteria. Take your number from there.

The timing problem a well household has

This is this site’s own reasoning from two facts. Standard outage advice says to fill containers when the power goes out. On municipal water that works. On a well, opening faucets during the outage is the thing that depressurizes the system. A well household’s window for filling containers closes before the outage starts. So the trigger for topping up stored water is the forecast, the storm track or a utility notification, not the lights going out. Our pets and power outages hub has a section on which outage clock you are on.

The pet loads that quietly assume a tap

The aquarium. Our aquarium and reptile power outage guide covers the ammonia threshold that triggers a partial water change, adding warm dechlorinated water when a tank has run cold, and how salinity climbs in a marine system as water evaporates. Every one of those instructions assumes water arriving from somewhere. No source cited here says what an aquarium keeper on a private well should use when the pump is down. Which water suits a stocked tank is a chemistry question with a conditioner, a source and a species attached, and worth asking your aquatic specialist before storm season rather than at hour six.

The fountain reservoir. A circulating fountain empties over days, faster in warm weather, when outages cluster. Our page on fountains and automatic feeders without power covers the device behavior. On a well, the refill you would do without thinking is the faucet you were just told not to open.

Cleanup. A stressed animal may have an accident indoors, and a household without running water has to clean it with something. Michigan’s two-grade suggestion applies: a sealed drinking supply and a separate non-potable supply in pails.

Hand washing. This is the step that quietly disappears with the tap. If your water is in question because disease-causing organisms may have entered a depressurized system, handling bowls, a fountain reservoir or an animal’s waste is handling something that may carry them. None of the well documents draws that conclusion, so it is our reasoning: keep stored water aside for washing hands with soap after handling those things, for as long as the water question is open.

If you have already drawn the tank

Plenty of people will read this after spending the reserve on a normal evening. That is the ordinary case, not a failure. What the documents describe next is testing, not treatment. Michigan: after a full depressurization, do not consume until testing verifies the water is potable, with two consecutive samples 8 hours apart showing no coliform bacteria. NEHA: have the water tested at a certified laboratory after an outage, and keep using bottled or stored water for drinking, cooking and bathing until results confirm safety and repairs are complete. Chester County adds flushing lines before drinking and notes disinfection may be advisable.

Three things this page will not do:

• Give a disinfection procedure. Michigan names the local health department as the contact for sample bottles, test selection and interpretation, and NEHA names the local health department, a certified laboratory or a university extension service.
• Tell you to treat the water at the point of use and give it to an animal. Our page on water purification for pets covers portable treatment gear and notes that the agency disinfection guidance it quotes is written for human drinking water. Nothing here extends that to a well that lost pressure.
• Tell you what to watch for in an animal that already drank it. That is a veterinary question. The human-side documents establish that the hazard is bacteria, viruses and other disease-causing organisms entering a depressurized system, arriving with no change in taste, odor or clarity. If a pet drank from your system while it was depressurized, or on a system with a powered treatment stage during an outage, call your veterinarian and say that specifically. An animal that is vomiting, has diarrhea, is lethargic or has stopped drinking is a call to make now, not tomorrow.

When the power comes back

PrivateWellClass publishes a restart sequence and says steps may vary by pump type and model, so consult the manufacturer’s instructions or a professional if anything is unclear. Check that power is fully restored before starting the pump, inspect the pump and surrounding components for visible damage or leaks, prime the pump if yours requires it, turn power back on, then monitor for unusual noises, leaks or other issues and call a professional if you see problems.

NEHA’s recovery section is an inspection list. It names electrical wires and connectors, the well cap, seals and vents, casing and aboveground piping, indoor piping, storage and pressure tanks, and overflow pipes. Its instruction on damaged wiring is unconditional: never touch damaged electrical wires under any circumstances, and contact a qualified electrician.

For the animals, the sequence that follows from the documents is: keep them on stored or bottled water until the testing question is answered, run the line flush Chester County describes before anyone drinks, and treat the bowls the way you would treat a drinking glass. Nothing used here sets a laxer standard for a dog’s bowl, and inventing one would be the kind of reasoning this site tries not to do.

Where this page has limits

Every source here is a motor manufacturer, a tank manufacturer, a state or county health authority, a CDC-funded professional association, a state water survey or a land-grant extension service. None addresses animals, and no pet-specific well-and-outage document is cited. A state veterinary association or an extension service may have published one. This page does not treat that gap as permission to invent the veterinary half. Product specifications for Honda, Jackery, EcoFlow and Anker are the manufacturers’ own published figures at 120 V; other models may differ.

Your well-and-outage checklist for a pet household

• Find out today whether your household is on a well or on municipal water, and write it on the same page as your veterinarian’s number. Half the households that need this page do not know which one they are.
• Read your tank’s model number off its label and look up its drawdown, not its tank volume. On an Amtrol Well-X-Trol the current sheet is form MC7025 (03/24) and the column is headed Drawdown (Gallons).
• Read your pressure switch setting off the gauge near the tank, because the same tank gives roughly 30 percent more usable water at 30/50 than at 50/70.
• Read your pump’s own plate and write down the model number, horsepower, volts and amps. Franklin’s manual shows two tables giving different figures for the same horsepower, so horsepower alone does not identify your motor.
• Store the animals’ emergency water before the season, in sealed containers on a rotation schedule, sized from a per-animal daily rate rather than from what is in the tank. On a well you cannot fill containers once the power is off without doing what Michigan tells you not to do.
• Keep a second, non-drinking water supply separate from the drinking supply. Michigan suggests pails for toilet flushing.
• Label the breaker that controls the well pump now, so turning it off during an outage takes five seconds rather than five minutes with a flashlight.
• During an outage, treat the pressure tank as a clock rather than a supply. Michigan instructs owners to refrain from opening faucets, taking showers or flushing toilets during extended outages, and contamination can arrive with no change in taste, odor or clarity.
• If the outage has started and there is no stored water in the house, get water from somewhere the well is not, rather than leaving a bowl empty: sealed bottled water indoors, containers filled before the outage, or a neighbor, relative or store on municipal water. That routing is this site’s own reasoning.
• If your well runs through a powered treatment unit, know it. Ohio says an unpowered treatment unit will not treat the water, making it unsafe for drinking, a hazard independent of pressure.
• If the system lost all pressure, plan on testing rather than judgment. Michigan’s clearance standard is two consecutive coliform samples 8 hours apart, and NEHA says to use a certified laboratory and stay on stored water until results come back.
• Call your veterinarian if an animal drank from a depressurized system or from a powered-treatment system that was down, and say that specifically. Do not wait for a symptom.
• If backup power for the pump is on your list, take Franklin’s Table 3 figures and your motor’s plate to a licensed well contractor or electrician rather than a product comparison. The generator and power stations covered here are published as 120 volt units.
• Never connect a generator to your home’s wiring without a transfer switch. Franklin says transfer switches must be used any time a generator is used as standby or backup on power lines, and to contact the power company for use and approval.
• Keep your local health department’s number with the veterinarian’s. Michigan and NEHA both name it as the contact for sample bottles, test selection and result interpretation.

The version you do on a quiet afternoon

Four things, none of which takes long, turn the whole of the above into a ten-minute event instead of an overnight problem.

Walk to the tank and photograph the label for the model number and, if it is there, the tank volume. Photograph the pressure gauge for the switch setting. Two photographs settle the gallons question permanently.

Walk to the pump’s disconnect or the panel and label the breaker. If your pump is a submersible in a drilled well you will not be reading a plate off the motor itself, but installation paperwork, the pressure switch enclosure or a service sticker on the tank usually carries the model and horsepower. Photograph whatever you find.

Stage the animals’ water where you will reach it in the dark, on the same rotation schedule as the rest of your kit. Our kit rotation checklist turns that into dated tasks, and our pet food and water storage page covers containers.

Then call your local health department once, before you need them, and ask where sample bottles come from and what the turnaround is for a coliform test in your county. Michigan’s clearance standard already tells you sampling takes at least eight hours end to end. The laboratory’s queue is the number none of these documents publishes as a general figure, and it decides how long your animals are on stored water. Our pet water after a flooded private well guide carries a well driller’s account of about a month’s turnaround during one hurricane’s aftermath in one state, alongside the EPA mobile labs deployed to shorten it. Treat that as a single data point, and ask your own county rather than borrowing someone else’s disaster.

Where to go next

This page is the quantified version of one paragraph on our pets and power outages hub, which maps the four household dependencies that need backup power.

How much water to store. How much water per dog in an emergency works through the competing per-pound rates, day-count standards and container criteria.

Generator or battery. Quiet generator versus power station for pets makes that category decision, and generator sizing for pet loads is the worksheet for totaling what you need to run. If a generator is already part of your setup, read generators, carbon monoxide and pets before you run one near an animal.

A tap that runs but you were told not to trust. Pets and a boil water advisory covers the municipal version, with different instructions.

A long outage. Inland hurricane preparedness for pets covers what a multi-week loss of power and water demands, using a documented case where clean water took far longer to return than electricity did.

Then do the one thing that pays off most, and it takes two minutes. Go and read the model number off your pressure tank. Everything else on this page is downstream of knowing whether the number you have been imagining is 44 gallons or 11.8.