Quick Answer
The high-level checklist:
- Pipes: Insulate exposed pipes, shut off and drain outdoor faucets/hoses, and let indoors taps drip in a hard freeze.
- Well pump: For submersible pumps below frost line, minimal work needed; for above-ground (jet) pumps and pump houses, drain or heat.
- Storage tanks: Drain tanks that can’t stay above freezing; insulate or heat tanks that must stay in service.
- Seasonal buildings/off-grid: Shut off the supply, drain the system, and add nontoxic antifreeze to traps and drains where needed.
Froze anyway? Shut off the water, open the lowest faucet, and gently thaw with heat tape or warm air ā never an open flame. The well winterization guide and water storage tank guide connect to the maintenance side of keeping a system healthy year-round.
Where Winter Damage Happens Most
Before worrying about the whole system, understand where ice actually does its damage. Freeze risk concentrates in a few predictable places:
| Risk Area | Why It’s Vulnerable |
|---|---|
| Outdoor faucets and hose bibs | Water sits at the surface, fully exposed to air |
| Exposed pipes (crawl spaces, attics, exterior walls) | Not insulated or shielded from cold |
| Above-ground well pumps and pump houses | Equipment and pipes exposed above the frost line |
| Outdoor storage tanks and collection gutters | Full tanks freeze and crack; rain barrels split |
| Sprinkler and irrigation lines | Installed shallow, hold water, rarely winterized |
| Seasonal/secondary buildings | Unheated, no one bleeding the lines |
The common thread: anything that holds water, is exposed to air temperature, and is not actively heated is at risk. Winterizing is a systematic check of every one of those.
Winterizing Your Pipes
Frozen pipes are the #1 winter water emergency. Here’s the practical program:
Insulate What’s Exposed
Wrap any pipe that runs through crawl spaces, attics, garages, exterior walls, or unheated basements in foam pipe insulation or heat tape. Pay extra attention to elbows and joints, which freeze first because they trap water. Insulation slows heat loss and buys time, but in extreme cold it may not be enough by itself ā combine it with heat tape for vulnerable runs.
Drain and Protect Outdoor Faucets (Hose Bibs)
- Disconnect and drain all garden hoses ā a connected hose holds water in the faucet and freezes the valve.
- Shut off the faucet’s interior shut-off valve (if there is one) and open the outdoor valve to drain the stub-out.
- Install frost-proof (freeze-proof) hose bibs where possible ā they’re designed so the actual valve sits inside the heated space.
Let It Drip During a Hard Freeze
When temperatures are predicted to drop into the low 20sĀ°F or below, open indoor faucets to a slow drip ā moving water is far less likely to freeze solid than standing water. Leave cabinet doors open under sinks so warm house air reaches the pipes.
Know the Signs of a Frozen Pipe
Low or no water pressure, sputtering faucets, frost on exposed pipes, or a musty smell all point to a frozen line. If you catch it early before the pipe cracks, you can often save it.
Winterizing Your Well Pump
Well pump winterization depends entirely on where the pump sits:
Submersible Pumps (Below the Frost Line)
Most modern wells use submersible pumps lowered deep in the well casing, well below the frost line. These are largely self-protecting in winter ā the water column and pump sit in earth that stays above freezing. The main tasks are to protect the exposed wellhead and above-ground piping and to make sure the pressure tank and control equipment in a pit or basement don’t freeze. The full well drilling guide covers system design; for winter, focus on the above-ground parts.
Above-Ground (Jet) Pumps and Pump Houses
These are the vulnerable ones. A pump house or exposed jet pump holds water in a body exposed to air temperature. To winterize:
- Drain the pump of standing water if it can be shut down for the season.
- Insulate the pump house walls and pipes.
- Install a thermostat-controlled heater in the pump house set just above freezing, or heat tape on critical lines.
- Consider shrink-wrapping or insulating exposed suction and pressure pipes.
Jet Pump in an Unheated Basement
If your basement is cold but above freezing, insulation on the pipes may suffice. If it dips low, add heat tape or leave a faucet dripping. Never let a jet pump freeze ā a cracked volute or impeller is an expensive fix.
Winterizing Storage Tanks
Tanks freeze differently depending on whether they must stay in service:
| Tank Situation | Winterizing Approach |
|---|---|
| Outdoor, seasonal (can be emptied) | Drain completely, disconnect, store indoors or dry |
| Outdoor, must stay in service | Insulate, add a tank heater (thermostat-controlled), keep a heat source on the house side |
| Rain barrels / gutters | Drain and disconnect; frozen water expands and splits them |
| Indoor heated storage | Minimal or no action; keep above freezing |
| Underground cistern | Usually safe below frost line; protect exposed piping |
The rule for tanks: a full, unprotected outdoor tank will freeze and crack. If you can empty it, that’s the simplest and safest option for winter. If it must hold water through winter, rate it for the cold: use a tank heater, insulate, and keep the surrounding area free of ice buildup. Never let any tank sit partially full in a way that risks ice damaging fittings on the top. For tanks you keep, the water storage tank maintenance guide covers the cleaning and algae side that matters once spring returns.
Rainwater/off-grid systems: disconnect gravity-fed collection from gutters for winter to avoid ice plugs in downspouts and lines. Winterize the downstream off-grid water systems the same way ā drain and isolate anything exposed.
Winterizing Seasonal Buildings and Off-Grid Properties
For cabins, cottages, RVs, and off-grid setups you leave over winter, the stakes are higher because there’s nobody to catch a leak or a freeze smell. The professional approach:
Fully Shut Down the System
- Shut off the main supply (either the well pump breaker/valve or the utility shutoff).
- Open every faucet (hot and cold), flush toilets, and open drain valves to get as much water out as possible.
- Drain the water heater and storage tank.
- Add nontoxic RV antifreeze (propylene glycol) to sink traps, toilet bowls, and any low points that can’t be fully drained.
- Disconnect hoses and drain hose bibs; store or insulate the well pump per the pump guidance above.
Leave It Prepared
Mark where shutoffs are, note the system on a checklist, and consider a remote temperature sensor or winterize alarm if the property is monitored. When you return in spring, flush the system thoroughly before using it for drinking water.
What to Do If Pipes Already Froze
If you discover a frozen pipe:
- Shut off the main water valve to stop pressure behind a potential crack.
- Open the faucet nearest the freeze (cold side) so water and steam can escape as it thaws.
- Gently thaw with a hair dryer, heat lamp (kept away from flammables), heat tape, or warm towels. Never use an open flame ā it can start a fire or crack the pipe.
- Work from the faucet toward the freeze point so thawed water has somewhere to exit.
- Check for cracks once thawed; a split pipe needs professional repair before you restore full pressure.
If your water pressure was lost to the system, test your well water and the system once temperatures recover.
FAQ
At what temperature do pipes freeze?
Pipes typically begin to freeze when outdoor temperatures drop to around 20Ā°F (-7Ā°C) or below, especially if they’re exposed or poorly insulated. The risk grows with sustained cold, wind, and lack of heat in the surrounding space. At 20Ā°F and below, run a drip and protect exposed pipes.
Do I need to winterize a submersible well pump?
Usually little to no work ā submersible pumps sit deep in the casing, below the frost line, and are protected by the ground. The vulnerable parts are the above-ground wellhead, piping, and pressure tank, which need insulation or heat. Only above-ground (jet) pumps and unheated pump houses need real winterizing.
Should I leave the faucet dripping in freezing weather?
Yes, in a hard freeze ā a slow drip keeps water moving, which is far less likely to freeze solid than standing water. It also relieves pressure if ice forms, reducing burst risk. This matters most for exposed pipes; pipes in heated walls usually don’t need it.
How do I drain my outdoor water tank for winter?
Shut off the inlet/outlet, open the drain valve fully, and let it empty completely. Disconnect hoses and fittings. For tanks that must stay out, move them indoors or cover, drain, and add roof drainage so rain/snow doesn’t refill and freeze them. See the tank maintenance guide for the full clean-and-refill routine in spring.
Can a buried or underground water tank freeze?
Underground tanks below the frost line generally don’t freeze, since surrounding soil stays above freezing. The risk is in exposed piping, the top of shallow tanks, and above-ground pump connections. Protect or drain those parts and underground cisterns are usually fine.
What should I do with my rain barrel in winter?
Drain it completely, disconnect it from the gutter, and store it (or cover it so it can’t refill). Freezing water expands and will crack the barrel wall and fittings. Reconnect in spring and follow the rainwater harvesting guide to get the system running safely again.
Is heat tape safe to leave on pipes?
Yes, when installed per manufacturer instructions. Use self-regulating heat tape rated for your pipe type, keep it away from insulation that can trap heat and cause hot spots, and follow the coverage rules. Heat tape + pipe insulation is the standard for vulnerable runs. For long-term unattended use, consider a thermostat-controlled version.
How do I sign off an off-grid cabin for winter?
Shut off the supply, open all faucets and drain valves, drain the water heater and tank, add nontoxic RV antifreeze to traps and toilets, disconnect hoses, and protect the pump per its type. Leave a written checklist and mark shutoffs. When you return, flush everything thoroughly before drinking.
What's the safest way to thaw a frozen pipe?
Shut off the water pressure, open the nearest faucet, then apply gentle heat ā a hair dryer, heat tape, warm towels, or a heat lamp kept away from flammables. Never use an open flame (torch, blowtorch), which risks fire and pipe damage. Thaw working from the faucet toward the freeze point and inspect for cracks before restoring full pressure.
Do I need to drain my well pump for winter?
Submersible pumps: no ā they’re below the frost line and don’t need draining. Above-ground (jet) pumps and pump houses: yes ā drain standing water from the pump body and protect the house with insulation/heat, since exposed water will freeze and can crack the pump. See the pump section above for the specifics by type.
The Bottom Line
Winterizing your water systems is a small seasonal task that prevents large, expensive damage. The principle is simple ā no trapped water may freeze ā and the checklist is predictable: drain outdoor faucets and hoses, insulate exposed pipes, protect or drain storage tanks, and handle the pump by its type (submersible = mostly fine; jet/pump house = drain or heat). For unoccupied properties, do a full drain-down with nontoxic antifreeze and leave it documented. Do it before the freeze, and you’ll spend spring enjoying your water instead of repairing it.
For supplies like pipe insulation, heat tape, and tank heaters, browse winterizing and plumbing supplies on Amazon.
This article is for informational purposes only and does not constitute professional advice.