Your well stops working when the power goes out

How long before the water stops

Your well system has a pressure tank — a bladder tank that holds water under pressure to even out pump cycles and maintain water pressure in the distribution system. Most residential pressure tanks are sized to hold 30 to 50 gallons, but the usable drawdown volume — the water you can actually use before pressure drops below usable levels — is typically 7 to 18 gallons depending on tank size and pressure settings.

A family of four flushes toilets, runs faucets, and uses appliances at a rate of 80 to 100 gallons per day under normal conditions. At modest usage during an outage, a standard pressure tank depletes in 15 to 30 minutes of active use. Many households do not notice the problem until faucets begin to sputter or toilets fail to refill.

This is not a design flaw — it is simply what the pressure tank was built to do. It was designed to smooth pump cycling under normal conditions, not to provide extended outage storage. Addressing the well-during-outage problem requires a different approach.

The three backup options

Option 1: Generator. A generator that provides enough power to run the well pump is the most convenient option — it restores normal water access without any changes to the well system. The catch is sizing. Submersible well pumps have a high starting current draw that exceeds their running wattage by two to three times. A typical 1/2 horsepower pump running at 800 watts may require 2,400 to 3,000 starting watts. Know your pump's starting wattage before purchasing a generator, and size accordingly with margin to spare. A generator sized only for running wattage will fail to start the pump.

Option 2: Hand pump installation. A deep well hand pump installed alongside the existing submersible provides water access with zero electricity, zero fuel, and zero mechanical dependency on the grid. Simple Pump and Bison Pump are the two production systems rated for residential use. Simple Pump installs in the same casing as the submersible and can route hand-pumped water directly into the home's plumbing. The investment runs $1,500 to $2,500 for equipment plus installation. It is a permanent infrastructure addition — the most capable long-duration solution available.

Option 3: Pre-filled storage. The most accessible starting point for most households. Food-grade storage containers filled from the well while the power is on provide water through an outage without requiring generator capacity or pump infrastructure. A two-week supply at 1.5 gallons per person per day — filled and rotated annually — handles the vast majority of power outages, which resolve within 72 hours for most households. It does not address sanitation (toilet flushing) but it covers drinking, cooking, and basic hygiene.

What to know before you choose

For most rural households, the practical answer is a combination of all three at different investment levels. Pre-filled storage is the immediate step — accessible and inexpensive, handles most outage durations. A generator capable of running the pump handles extended outages and preserves normal household function. A hand pump is the long-duration, grid-independent solution for households in regions with frequent or prolonged outage risk, or for those who want true independence from fuel availability.

Know your pump's electrical specifications before doing anything else: horsepower, voltage, running amps, and starting current. This information is on the pump nameplate or the well driller's completion report. Without it, generator and hand pump compatibility cannot be assessed accurately.

What to do right now

1. 1 Find your pump's specifications. Horsepower, voltage, and starting watts are on the pump nameplate or in the well driller's completion report. If neither is available, a licensed well contractor can pull and read the specifications.
2. 2 Fill storage containers now. Before the next outage, not during it. Food-grade HDPE containers filled from the well tap, dated, and stored in a cool location give your household water access regardless of what happens to the grid or the generator.
3. 3 If you have a generator, verify it can start your pump. Run the pump from the generator under controlled conditions — not during an outage — to confirm starting capacity before you need it to work.
4. 4 Consider a hand pump quote for the long term. Contact Simple Pump or Bison Pump with your well specs. Getting a quote costs nothing and tells you exactly what installation would require for your specific well.