Missouri storms and ice events can knock out household power for a long stretch, and a private well is one of the systems that stops with it. Most well pumps run on electricity, so when the power goes off, the house loses pressure water even if the aquifer below is full. This guide covers what to check before an outage, what to keep on hand, and what to look at once service returns.
How a Well Behaves Without Power
A typical home well has a submersible pump at depth, a pressure tank, and a pressure switch. The pressure tank holds a limited reserve of water under air pressure, so you may get a few flushes or a short shower before the taps run dry. A short outage does not damage the well itself, but the water supply inside the house stops until the pump runs again.
Hand-operated or gravity-fed systems are uncommon in most Missouri homes, so plan around the assumption that the pump will not run.
Before the Outage: Map Your Pump Circuit
- Find the breaker or fuse that feeds the well pump, and label it on the panel if it is not already labeled.
- Note whether the pump has a dedicated circuit or shares one with other loads.
- Locate the pressure tank and gauge, and learn what a normal reading looks like on your system.
- Confirm where the main water shutoff and any pump house shutoffs are.
- Keep a written record of the pump model, the well depth, and the service contact information already on file for your system.
Generator Options and Safety
A portable generator can run a well pump, but the setup needs care. Keep the generator outdoors and away from doors, windows, and vents, because exhaust can collect inside a home or attached garage. Carbon monoxide comes from fuel-burning equipment, so a working detector near sleeping areas is a basic step.
Never connect a generator to household wiring by plugging it into a wall outlet or back-feeding through a standard outlet. This can energize utility lines and injure line workers, and it can damage equipment. A transfer switch or inlet installed by a licensed electrician is the proper route for a permanent home generator. Ask the electrician to confirm the pump's starting load, because well pumps often draw a surge when they start.
Storing Water for the Gap
- Use containers made for drinking water, or food-grade containers that have never held chemicals.
- Do not reuse containers that once held fuel, cleaning products, or pesticides.
- Label each container with its fill date, and keep it sealed and out of direct sunlight.
- Keep water for drinking and cooking separate from water set aside for flushing.
- Rotate stored water on a regular schedule rather than trusting old containers.
How much to store depends on how many people live in the home and how long an outage tends to last where you live. Set that amount from your own household needs rather than from any general figure.
After Power Returns
When electricity comes back, the pump may restart with a short burst of sputtering, and the water may look cloudy for a while. Let the system run and watch the gauge. If the pump cycles rapidly, or the taps do not reach normal pressure, shut the pump off at the breaker and check the pressure tank and switch.
Run each cold tap for a while to clear trapped air and loosened sediment. Then check the water for clarity, odor, and taste. Any change that lasts, or that seems new, is worth a closer look.
Testing After a Long Loss of Pressure
A prolonged loss of pressure can allow water to move in unexpected ways through some plumbing, especially where a line has a leak or an opening below the waterline. Homeowners often skip testing because the water looks normal. A sample sent to a certified laboratory in Missouri is a reasonable step after a long outage, and the lab can tell you which tests fit your situation.
Frozen Pump Houses During Winter Outages
Ice storms can take out power while temperatures stay low. A pump house without heat can freeze, and frozen lines can split. Check any above-ground piping during the outage, and if the house must be left unheated, ask a qualified person about draining options before the next cold spell.