The Power Just Went Out: Your First-10-Minute Playbook

The power just died, and if your house runs on a well and septic, the outage took more than the lights with it. No new water. No sump pump. No furnace fan. Possibly a screaming septic alarm. Here is the good news: nothing is broken yet. For the next ten minutes you just need to work a short list, in order — and understand which clocks are now ticking.

The first 10 minutes, in order

1. Confirm it's the grid, not just your house. Check your main breaker — a tripped breaker is your problem, not the utility's. Look outside: if the neighbors are dark too, it's the grid. Then report the outage to your utility — state emergency guidance is explicit about this step, and the utility can't fix what it doesn't know about.
2. Stop using water. Your well pump runs on electricity, so no power means no new water — period. Whatever is sitting in your pressure tank is all you have until the grid comes back (details below).
3. Check the sump pit. This is the most time-sensitive item on the list. Your primary sump pump is electric; right now it is doing nothing.
4. Keep the fridge and freezer doors closed. Every opening shortens the safe window.
5. Glance at your septic control panel, if you have one. Note whether an alarm is sounding or lit — then leave it alone for now (the septic section below explains what it means).
6. If it is below freezing outside, start thinking about pipes — your furnace fan is dead too, and the house is now cooling.
7. Generator owners: set it up correctly before you start it. The generator section below has the rules.

Your water: what's actually left

A standard submersible well pump runs on a 230-volt motor fed by a dedicated 240-volt breaker, so when the grid dies the pump stops instantly. What you still have is the drawdown in your pressure tank — the pocket of pressurized water the tank was holding at the moment the power cut. For a typical residential bladder tank, that is a few gallons:

(From the Amtrol Well-X-Trol spec sheet; university extension tables put similar-size tanks in the same ballpark. If your system runs 30/50 pressure, the numbers are a bit larger.)

Two honest caveats. First, the tank might have been anywhere in its cycle when the power died — you could have a full drawdown or almost nothing, and there is no gauge that tells you which. Second, every gallon from here on is a flush decision: no showers, no laundry, no dishwasher, no watering until the power returns.

The toilet math

Federal law caps new toilets at 1.6 gallons per flush, and WaterSense models use 1.28 (U.S. Department of Energy). So that 20-gallon tank's ~6 gallons buys roughly 3–4 flushes; a larger tank's ~13 gallons buys roughly 8–10. Prioritize accordingly.

If you have stored water — jugs, or a bathtub filled before the storm — you can still flush without running water. Water utilities describe the two workarounds: fill the toilet tank and flush normally, or pour water directly into the bowl — the force of the pour trips the siphon and the bowl empties (per the City of Asheville, NC water department's storm guidance). Plan on one bucket per flush, and save your flushes for when they matter.

Septic: what the outage does to it

Your septic system does not all behave the same way in a blackout. It depends on the type:

The 24-hour alarm rule and the essentials-only list come from Texas A&M AgriLife Extension's outage guidance (ER-001) and the Ohio Department of Health's septic power-outage guidance — the same two documents agree with each other almost word for word. Ohio adds one number worth knowing: the septic tank itself holds about one day's worth of waste, so for an ordinary outage the tank is not your problem; overfilling it is only a multi-day concern.

For the longer version of how your system type works, see the septic system explainer and the aerobic system guide.

The sump pit: your most time-sensitive check

Walk down and look at the pit. The primary pump is AC-powered — it died with the grid. If you have a battery-backup sump system (a 12-volt DC pump sitting in the pit alongside the primary, from makers like Wayne or Zoeller), it should have taken over automatically — but the battery is a bridge, not a solution. It buys you a limited window, and you should still minimize what's flowing into the pit.

If water is rising toward the floor: move valuables up, and bail by hand if you have to. Two safety rules from Ready.gov's flood guidance: do not touch electrical equipment if it is wet or if you are standing in water, and turn off electricity to the area if you can do it safely. If the water is still rising and you cannot keep up, this is the one situation in this playbook where calling for help beats waiting — a flooded basement with live circuits is genuinely dangerous.

One honest note: water-powered backup sump pumps exist, but they run on incoming municipal water pressure. On a dead well you have no incoming pressure, so that flavor of backup does nothing for you. The 12-volt battery kind is the one that works off-grid.

Food: the clocks that are now ticking

From the USDA's FoodSafety.gov outage guidance — the authoritative numbers:

The discard rules: any perishable (meat, poultry, fish, eggs, leftovers) that has been above 40°F for 2 or more hours goes in the trash — 1 hour if it is above 90°F. FoodSafety.gov's own summary is blunt: when in doubt, throw it out, and never taste food to check whether it is still safe. A freezer full of food with ice crystals still on it is fine to refreeze; quality may suffer, but safety does not.

Pipes: the winter clock

This section only matters if it is freezing outside — but when it matters, it matters a lot. Your furnace fan is dead, so the house is now cooling on its own, and the pipes have no moving water to protect them.

The standard advice — let a faucet drip — comes from the Red Cross, and it works because moving water resists freezing. Here is the catch: the drip trick requires running water, and you do not have any. So do not leave faucets open hoping for a trickle; you will just drain your pressure tank for nothing.

What extension services actually recommend for a winter power failure that will last a while: shut off the water at the main valve, open all faucets until they drain completely, and drain the toilet flush tanks (Purdue University Extension). If the outage hits during extreme cold and you cannot keep the house warm, the Red Cross's advice is to stay with family or go to a public shelter rather than ride it out — frozen pipes burst, and burst pipes flood.

For the full winter-prep version of all of this, read how to winterize your well and septic system before the next storm, not during it.

If you have a generator

Do not just wheel it out and fire it up — most generator injuries happen in exactly this moment, in a hurry, in the dark. The rules, from the Consumer Product Safety Commission:

• Outdoors only, at least 20 feet from the house, exhaust pointed away from windows, doors, and vents. Never in a garage — even with the door open. Generators produce lethal levels of carbon monoxide, and "the door is open" does not make it safe.
• Never plug a generator into a wall outlet or the main panel. FEMA is explicit about this: backfeeding energizes utility lines and can kill lineworkers. The only safe connections are a transfer switch or a listed interlock kit, installed by an electrician.
• Report the outage and check in with the utility before assuming your setup is fine — and if your generator is sized for the house, remember the well pump is the heaviest load to start. The generator size calculator and the well-pump generator guide cover that math.

The deeper version of all of this — transfer switches, fuel choices, portable vs. standby — is in how home backup power works.

When the power comes back

Power often returns with momentary surges, which is why Ready.gov tells you to disconnect appliances and electronics during the outage. As things come back:

• Well: listen for the pump and watch the pressure gauge climb back to cut-out. If pressure does not build, run the no-water triage — it walks the safe homeowner checks in order.
• Septic: your aerobic panel may alarm now that it has power. Silence it if you can; if it is still alarming 24 hours later, call your service provider. Gravity systems need nothing.
• Sump: confirm the primary pump restarts and the pit level drops.
• Restock: refill the bathtub and jugs if the outage taught you that lesson — that is storm prep, and it is free. Print the one-page rural home emergency card for the fridge while you are at it.

And if this outage made you realize you want a real plan for the next one, start with the backup power hub — sizing, costs, and the portable-vs-standby decision.

What this playbook can't do

Honesty section, because a 10-minute playbook has limits:

• It does not cover multi-day outages. A day or more without power on a well means no water at all — the pressure tank emptied hours ago. That scenario needs a generator and a fuel plan, not a checklist.
• Stored water is storm prep, not a mid-outage fix. If the bathtub is not already full, this playbook cannot conjure water for you. Fill it before the next storm.
• A battery sump backup is measured in hours. If the storm is parked over you, the battery is buying time to bail or to get help, not solving the problem.
• It will not fix something that was already broken. If the septic alarm was sounding before the outage, or the well was already acting up, those are different problems — see signs your drainfield is failing or the well troubleshooting guide.