Missouri winters can move from mild afternoons to hard freezes within a day, and ice storms that knock out electricity are a familiar part of life in many parts of the state. For a household on a private well, that weather puts pressure on parts of the water system most people rarely see: the well head, the pressure tank, the pump controls, and pipes that run through spaces that are not heated. This page is an independent reference with a plain checklist for the cold season. It is not a service provider, and it does not replace advice from a licensed well contractor or plumber.
Start with the well house and pressure tank
Many Missouri well systems have the pressure tank and controls in a basement, a utility room, a crawlspace, or a small well house outdoors. Walk through that space on a dry day and look for the following.
- Cold air drafts from doors, vents, or gaps around pipes that enter the space.
- Damp or frost on pipes, fittings, or the tank itself.
- Any existing heater or heat lamp, and whether its cord, plug, and thermostat are in good shape.
- Vent openings on the well house or well cap, checked for blockage by snow, leaves, or nesting animals.
A heater in a well house is only useful if it is installed according to its maker's instructions and kept clear of anything that can catch fire. Never block airflow around electrical equipment with stored items.
Protect exposed plumbing
Pipes most likely to freeze are the ones closest to an outside wall, under a kitchen or bath cabinet on an exterior wall, or in an attic, crawlspace, or garage. Simple steps help.
- Seal visible gaps where pipes pass through the foundation or rim joist with foam or caulk.
- Add insulating sleeves to exposed pipes in unheated spaces.
- Open cabinet doors under sinks on exterior walls during a hard cold snap so warm room air can reach the pipes.
- Keep the thermostat at a steady setting rather than turning the house down overnight.
- Learn where the main shutoff valve is and how to drain the system if a line freezes.
If a pipe is frozen, do not use an open flame to thaw it. Warm the section gently with a hair dryer or warm towels, and turn on the faucet nearest the blockage so water can flow once the ice melts. If you cannot find the frozen section or the pipe has split, shut off the water at the main valve and call a licensed plumber.
Check outdoor hose bibs and irrigation
Outdoor faucets and hose connections are a common place for winter damage. Disconnect garden hoses before the first hard freeze, and use a freeze-resistant indoor shutoff for outdoor faucets when one is installed. Drain any irrigation lines that are not designed for winter use, following the equipment maker's directions. A small drip at an outdoor faucet during a freeze is a useful warning sign that water is moving toward the cold section of pipe.
Plan for power outages
Most private wells depend on electric pumps, so an outage stops the flow of water to the house. Missouri storm seasons can bring outages that last for many hours, and cold weather makes them more serious. Before winter, decide how the household will handle an outage. Keep a supply of drinking water on hand, know how to run a generator safely if you have one, and never run a gasoline or propane generator inside a home, garage, or other enclosed space. If the house uses a water softener or other treatment equipment, check whether it can operate on a generator and how it recovers after power returns.
Watch for signs of trouble
Winter problems often show up quietly. Keep an eye out for pressure that falls off between uses, a pump that runs longer than usual, sputtering at faucets, or water that looks cloudy after a cold snap. Any change in the taste, color, or smell of water should be investigated rather than assumed to be harmless. If you notice a change, a state-certified laboratory can run a test on a sample taken from a cold tap, and a licensed contractor can check the pump and pressure controls.
Keep a simple winter log
A short written log makes it easier to spot a pattern. Note the date of each cold snap, any outages, the condition of the well house heater if there is one, and anything unusual you saw or heard at the pump or the faucets. Over a few seasons, the log shows which pipes or spaces are most exposed and which steps made a difference.
Winter care for a Missouri well is mostly about routine attention. Check the well house, protect the exposed pipes, plan for outages, and act quickly when something changes. This page is an independent reference, and the steps above are general guidance for homeowners to adapt to their own system with a qualified professional.